Metallocenes for the manufacture of polypropylene

Abstract

The disclosure relates to a metallocene complex of formula (I) wherein Mt is Zr or Hf; L is O or S; X is a sigma ligand; R1 are each independently, same or different from each other, C1-C20-hydrocarbyl, optionally containing up to two heteroatoms of Group 14-16 of the Periodic Table, or form together with the Si atom they are attached to a C4-C8-ring; R2 is heteroaryl, C6-C10-aryl, or linear or branched C1-C10-hydrocarbyl, whereby said C6- C10-aryl and heteroaryl are optionally substituted with 1 to 3 R21'; with R21' being C1-C10- hydrocarbyl; R2' is heteroaryl or C6-C10-aryl, R2' being optionally substituted with 1 to 3 R21'; with R21' being C1-C10-hydrocarbyl; n are each independently, same or different from each other, an integer from 1 to 5; R3 and R4 are each independently, H or C1-C20-hydrocarbyl or –OR31, wherein R31 is C1- C10-hydrocarbyl, whereby at least one R3 and at least one R4 is not hydrogen; R51 and R51' are each independently, same or different from each other, C1-C10- hydrocarbyl; and R6 and R6' are each independently, same or different from each other, C(R61)3, with R61 being linear or branched C1-C6-alkyl.

Description

[0001] METALLOCENES FOR THE MANUFACTURE OF POLYPROPYLENE FIELD OF THE DISCLOSURE The present disclosure relates to new indenyl ligands, bisindenyl ligands comprising said indenyl ligands, complexes thereof, and catalysts comprising those complexes. The present disclosure also relates to the use of the new bisindenyl metallocene catalysts for the production of polypropylene homopolymers with very high melting points or propylene copolymers, especially with ethylene, in particular heterophasic polypropylene, with high molecular weight, and hence low MFR. BACKGROUND OF THE DISCLOSURE Metallocene catalysts have been used to manufacture polyolefins for many years. Countless academic and patent publications describe the use of these catalysts in olefin polymerization. Metallocenes are now used industrially and polyethylenes and polypropylenes in particular are often produced using cyclopentadienyl based catalyst systems with different substitution patterns. WO2007116034 describes C2-symmetric complexes bearing 5-methoxy substituents and 6-tert-butyl substituents and linear 2-substituents. Such catalysts produce relatively low melting hPP of 148 to 150 °C. WO2018091684 describes C2-symmetric rac-Me2Si(2-Me-4-(3,5-Me2Ph)-5-OMe-6-tBu- Ind)2ZrCl2 complex, that produces hPP with low Tm of 150-151 °C. US6995279 discloses C1-symmetric complexes including one 2-[2-(5- methylthienyl)]indenyl ligand and one 2-methylindenyl ligand. While the polymerization performance of this complex is not reported, the analogue C1-symmetric complex including one 2-[2-(5-methylfuryl)]indenyl ligand and one 2-methylindenyl ligand, supported on silica, produces hPP with low Tm=155°C. While these prior art catalysts have their advantages, they lack in isoselectivity, in particular in the absence of borate containing cocatalyst, generating hPP with a relatively low melting and crystallisation temperature due to the formation of insertion regiodefects in the PP chains. The present inventors thus sought new metallocenes, which are able to provide high isoselectivity without compromising productivity, especially in the case of the homopolymerization of propylene or in the case of copolymerization between propylene and ethylene. The desired catalysts should also have improved performance in the production of high melting temperature and high molecular weight polypropylene homopolymers (hPP). The desired catalysts should also have improved performance in the production of propylene-ethylene copolymers, for instance having high activity for high Mw copolymer products. The desired catalysts should also provide propylene-ethylene copolymers having high molecular weight. Further, the desired catalysts should also be able to produce hPP with Tmat least 157 °C. BRIEF DESCRIPTION OF THE DISCLOSURE An object of the present disclosure is to provide new ligands, metallocene complexes, and hence catalysts that overcome the above problems. The object of the disclosure is achieved by ligands of formula (II), metallocene complexes of formula (I), polymerization catalyst comprising said metallocene complex of formula (I), and process for polymerization of polypropylene optionally with comonomers which are characterized by what is stated in the independent claims. The preferred embodiments of the disclosure are disclosed in the dependent claims. It was surprisingly found that specific modification of either C2-symmetric or C1-symmetric, preferably C2-symmetric, metallocenes incorporating aryl or heteroaryl group at 2-position of at least one of the indenyl moieties, in combination with specific substitution of the 4, 5 and 6 ligand positions, provide the desired properties. The identified metallocene complexes when included in a polymerization catalyst, preferably supported catalyst system, composed of the said specific class of metallocene complexes in particular in combination with an aluminium containing cocatalyst have improved polymerization behavior, higher catalyst productivity, improved performance in the production of propylene homopolymers, propylene random copolymers and heterophasic propylene copolymers compared to systems known in the art, enabling the production of propylene-ethylene copolymers of high Mw, thus being ideal for the production of propylene random copolymers, especially propylene-ethylene random copolymers, and also suitably heterophasic propylene copolymers. The specific catalyst system gives a higher flexibility / freedom in the design of propylene polymers than prior art catalyst systems. An advantage of the disclosure is that these metallocene, in particular upon MAO activation, allow the production of propylene polymers with high isoselectivity, producing homopolymer polypropylene (hPP) with higher Tm. BRIEF DESCRIPTION OF THE DRAWINGS In the following the disclosure will be described in greater detail by means of preferred embodiments with reference to the accompanying drawings, in which Figure 1 shows the hPP melting points obtained with the five catalysts CE1, IE1, IE2, IE3, IE4 as a function of the MFR of the homopolymer; Figure 2 shows results of propylene / ethylene copolymerization in liquid propylene. DEFINITIONS Throughout the description, the following definitions are employed: The term “C1-C20-hydrocarbyl” includes C1-C20-alkyl, C2-C20-alkenyl, C2-C20-alkynyl, C3-C20-cycloalkyl, C3-C20-cycloalkenyl, C6-C20-aryl, C7-C20-alkylaryl, and C7-C20-arylalkyl groups or of course mixtures of these groups such as cycloalkyl substituted by alkyl. Unless otherwise stated, preferred C1-C20-hydrocarbyl groups are C1-C20-alkyl, C4-C20-cycloalkyl, C5-C20-cycloalkyl-alkyl groups, C7-C20-alkylaryl groups, C7-C20-arylalkyl groups, and C6-20-aryl groups, especially C1-C10 alkyl groups, C6-C10-aryl groups, and C7-C12-arylalkyl groups, e.g. C1-C8 alkyl groups. Most especially preferred hydrocarbyl groups are methyl, ethyl, propyl, isopropyl, tert-butyl, isobutyl, C5-C6-cycloalkyl, cyclohexylmethyl, phenyl, and benzyl. The term “C1-C20-hydrocarbyl” includes C1-C20-alkyl, C2-C20-alkenyl, C2-C20-alkynyl, C3-C20- cycloalkyl, C3-C20-cycloalkenyl, C6-C20-aryl, C7-C20-alkylaryl, and C7-C20-arylalkyl groups or of course mixtures of these groups such as cycloalkyl substituted by alkyl. Unless otherwise stated, preferred C1-C20-hydrocarbyl groups are C1-C10-alkyl, C4-C10-cycloalkyl, C5-C10-cycloalkyl-alkyl groups, C7-C10-alkylaryl groups, C7-C10-arylalkyl groups, and C6-C20- aryl groups, especially C1-C6-alkyl groups, C6-aryl groups, and C7-C10-arylalkyl groups, e.g. C1-C6-alkyl groups. Most especially preferred hydrocarbyl groups are methyl, ethyl, propyl, isopropyl, tert-butyl, isobutyl, C5-C6-cycloalkyl, cyclohexylmethyl, phenyl, and benzyl. The term “C1-C10-hydrocarbyl” includes C1-C10-alkyl, C2-C10-alkenyl, C2-C10-alkynyl, C3-C10- cycloalkyl, C3-C10-cycloalkenyl, C6-C10-aryl, C7-C10-alkylaryl, and C7-C10-arylalkyl groups or of course mixtures of these groups such as cycloalkyl substituted by alkyl. Unless otherwise stated, preferred C1-C10-hydrocarbyl groups are C1-C10-alkyl, C4-C10-cycloalkyl, C5-C10-cycloalkyl-alkyl groups, C7-C10-alkylaryl groups, C7-C10-arylalkyl groups, and C6-C10- aryl groups, especially C1-C6-alkyl groups, C6-aryl groups, and C7-C10-arylalkyl groups, e.g. C1-C6-alkyl groups. Most especially preferred hydrocarbyl groups are methyl, ethyl, propyl, isopropyl, tert-butyl, isobutyl, C5-C6-cycloalkyl, cyclohexylmethyl, phenyl, and benzyl. It is to be noted that linear and branched hydrocarbyl groups cannot contain cyclic units. Aliphatic hydrocarbyl groups cannot contain aryl rings. The term “heteroatoms of Group 14-16 of the Periodic Table” includes for example Si, N, O or S. The term “C4-C8-ring” as used herein in connection to -R1 2Si-, refers to cyclic groups containing 4 to 8 carbon atoms and a Si atom and includes for example silacycloalkanediyls, such as silacyclobutane, silacyclopentane, or 9-silafluorene The term “halogen” includes fluoro, chloro, bromo, and iodo groups, especially chloro or fluoro groups, when relating to the complex definition. The oxidation state of the metal ion is governed primarily by the nature of the metal ion in question and the stability of the individual oxidation states of each metal ion. It is appreciated that in the complexes of the invention, the metal ion is coordinated by ligands X to satisfy the valence of the metal ion and to fill its available coordination sites. The nature of these sigma-ligands can vary greatly. The numbering of these rings will be evident from the structures indicated herein. Catalyst activity is defined in this application to be the amount of polymer produced / g catalyst / h. Catalyst metal activity is defined here to be the amount of polymer produced / g Metal / h. The term productivity is also known to be used to indicate the catalyst activity although herein it designates the amount of polymer produced per unit weight of catalyst. The term “molecular weight” is used herein to refer to weight average molecular weight Mw unless otherwise stated The term “heteroaryl” as used herein and hereafter refers to an aromatic monocyclic or bicyclic, preferably monocyclic, radical of 5 to 10 ring members in which one or more, preferably one, ring members are heteroatoms belong to groups 14-16 of the Periodic Table, preferably O, S or N, the remaining ring atoms being carbon. The heteroaryl may optionally be substituted with 1 to 3 C1-C10-hydrocarbyls as defined in the description. DETAILED DESCRIPTION OF THE DISCLOSURE The present invention relates to a series of new ligands, metallocene complexes and hence catalysts that are ideal for the polymerization of olefins, in particular propylene. Metallocene catalyst complexes The complexes of the invention can be asymmetrical or symmetrical, preferably asymmetrical. Asymmetrical means simply that the two indenyl ligands forming the metallocene are different, that is, each indenyl ligand bears a set of substituents that are either chemically different, or located in different positions with respect to the other indenyl ligand. Symmetrical complexes are based on two identical indenyl ligands. The complexes of the invention are chiral, racemic, bridged bisindenyl metallocenes. The metallocenes of the invention are either C2-symmetric or C1-symmetric, preferably C2- symmetric. When they are C1-symmetric, they still maintain a pseudo-C2-symmetry since they maintain C2-symmetry in close proximity of the metal center although not at the ligand periphery. By nature of their chemistry, both a meso form and a racemic enantiomer pair (in case of C2-symmetric complexes) or anti and syn enantiomer pairs (in case of C1- symmetric complexes) are formed during the synthesis of the complexes. For the purpose of this invention, racemic-anti means that the two indenyl ligands are oriented in opposite directions with respect to the cyclopentadienyl-metal-cyclopentadienyl plane, while racemic-syn means that the two indenyl ligands are oriented in the same direction with respect to the cyclopentadienyl-metal-cyclopentadienyl plane, as shown in the scheme below. Racemic Anti Racemic Syn Preferred metallocene catalyst complexes are in the anti-configuration. The metallocene complexes are preferably employed as the racemic-anti-isomers. Ideally, therefore at least 90 mol%, such as at least 95 mol%, especially at least 98 mol% of the metallocene catalyst complex is in the racemic anti-isomeric form. For the purpose of this invention, the numbering scheme of the indenyl ligands is the following: It will be appreciated that in the complexes of the invention, the metal ion Mt is coordinated by ligands X so as to satisfy the valency of the metal ion and to fill its available coordination sites. The nature of these σ-ligands can vary greatly. The present invention accordingly relates to metallocene complexes of formula (I) wherein Mt is Zr or Hf; L is O or S; X is a sigma ligand; R1are each independently, same or different from each other, C1-C20-hydrocarbyl, optionally containing up to two heteroatoms of Group 14-16 of the Periodic Table, or form, together with the Si atom they are attached to, a C4-C8-ring; R2is heteroaryl, C6-C10-aryl, or linear or branched C1-C10-hydrocarbyl, whereby said C6- C10-aryl and heteroaryl are optionally substituted with 1 to 3 R21’; with R21’being C1-C10- hydrocarbyl; R2’ is heteroaryl or C6-C10-aryl, R2’being optionally substituted with 1 to 3 R21’; with R21’ being C1-C10-hydrocarbyl; n are each independently, same or different from each other, an integer from 1 to 5; R3and R4are each independently, H or C1-C20-hydrocarbyl or –OR31, wherein R31is C1- C10-hydrocarbyl, whereby at least one R3and at least one R4is not hydrogen; R51and R51’ are each independently, same or different from each other, C1-C10- hydrocarbyl; and R6and R6’ are each independently, same or different from each other, C(R61)3, with R61 being linear or branched C1-C6-alkyl. For the above-defined metallocene complexes of formula (I), the following represent preferable embodiments, which can be selected alone or in combination: In a complex of formula (I) it is preferred if Mt is Zr or Hf, preferably Zr. Each X is a sigma ligand. Preferably, each X is independently, same or different from each other, H, halogen, C1-C6-alkoxy, or R´ group, where R´ is C1-C6-alkyl, phenyl, or benzyl. More preferably, each X is independently, same or different from each other, Cl, benzyl, or methyl. It is preferred that both X groups are the same. Most preferably both X are Cl, methyl, or benzyl, especially Cl. Preferably R1are each independently, same or different from each other, C1-C10- hydrocarbyl, more preferably C1-C10-alkyl, C4-C10-cycloalkyl, C5-C10-cycloalkyl-alkyl, C7- C10-arylalkyl, C6-C10-aryl, or C7-C10-alkylaryl, such as methyl, ethyl, propyl, isopropyl, tert- butyl, isobutyl, C3-C8-cycloalkyl, cyclohexylmethyl, phenyl, or benzyl, even more preferably both are C1-C6-alkyl, C5-C6-cycloalkyl, or C6-aryl. In an embodiment each R1is independently, same or different from each other, C1-C10-alkyl, optionally substituted with C1-C10-alkoxy. It is preferred that both R1groups are the same. Most preferably, both R1are methyl. Preferably R2is C6-aryl, heteroaryl of 5 to 6 ring members in which one ring member is O, S, or N, or CH2-R21, with R21being H, linear or branched C1-C6-alkyl, such as methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, sec-butyl, tert-butyl, more preferably R21being H or linear or branched C1-C3-alkyl, and whereby said C6-aryl and heteroaryl are optionally substituted with 1 to 3 R21’, with R21’ being C1-C6-alkyl, preferably C1-C3-alkyl. More preferably R2is phenyl, heteroaryl of 5 ring members in which one ring member is O or S, or CH2-R21, with R21being H or linear C1-C3-alkyl, such as methyl, ethyl, or n-propyl, preferably R21being H or methyl, and whereby said phenyl and heteroaryl are optionally, yet preferably, substituted with 1 or 2 R21’, with R21’ being C1-C6-alkyl, preferably R21’being C1-C3-alkyl. Even more preferably R2is phenyl, furyl, thienyl, or CH2-R21, with R21being H or C1-C3- alkyl, such as methyl, preferably R21being H, and whereby said phenyl, furyl, and thienyl are optionally, yet preferably, substituted with 1 or 2 R21’; with R21’ being methyl. Most preferably R2is phenyl substituted with 1 or 2 C1-C3-alkyl, methylfuryl, methylthienyl, such as 5-methyl-2-furyl or 5-methyl-2-thienyl, or CH2-R21, with R21being H or methyl, preferably R21being H. Advantageously R2is CH2-R21, with R21being H, linear or branched C1-C6-alkyl, such as methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, sec-butyl, tert-butyl, more preferably R21being H or linear or branched C1-C3-alkyl, even more preferably H or linear C1-3-alkyl, such as methyl, ethyl, or n-propyl, yet more preferably H or methyl, most preferably H. Preferably R2’ is C6-aryl or heteroaryl of 5 to 6 ring members in which one ring member is O, S, or N, R2’being optionally substituted with 1 to 3 R21’; with R21’ being C1-C10- hydrocarbyl, preferably C1-C6-alkyl; more preferably R2’ is phenyl or heteroaryl of 5 ring members in which one ring member is O or S, R2’being optionally, yet preferably, substituted with 1 or 2 R21’, with R21’ being C1-C6-alkyl, preferably C1-C3-alkyl; more preferably R2’ is phenyl or thienyl, R2’being optionally substituted with 1 or 2 R21’, with R21’ being methyl. It is preferred that the R2’and / or R2aryl and heteroaryl are substituted. Advantageously the R21’substituents of the respective R2and / or R2’aryl ring are in the 3-, 4-, and / or 5- position of the ring, whereby the 1-position is attached to the indenyl ring. Further advantageously the R21’substituents of the respective R2and / or R2’heteroaryl ring are in the 3-, 4-, and / or 5-position of the ring, whereby the 2-position is attached to the indenyl ring. It is for example possible that a phenyl ring substituted in the para position i.e.4´ position only, like 4´-tert-butyl phenyl, or di-substituted in the meta positions, i.e.3´ and 5´ position, like 3´,5´-dimethylphenyl or 3´,5´-ditert-butylphenyl. Furthermore, it is possible that the phenyl ring has the same substitution pattern as the phenyl rings in the 4-position of the indenyl rings or that the phenyl rings on the 2- and 4-position have different substitution patterns. As a further example, it is possible that the heteroaryl is substituted at the position next to the heteroatom. It is therefore preferred that when R2’and / or R2is phenyl, and the phenyl is substituted with one R21’; the only R21’ group is preferably in the para position. If the R2’or R2phenyl is substituted with two R21’; then the two R21’ groups are preferably in the meta positions. It is further preferred that when R2’and / or R2is a heteroaryl of 5 ring members, and is substituted with one R21’; the only R21’ group is preferably in 5´ position, whereby the 2´- position is attached to the indenyl ring. Advantageously R2is methyl and R2’is phenyl or heteroaryl of 5 ring members in which one ring member is O or S, R2’being substituted with 1 or 2 R21’, with R21’ being C1-C6- alkyl, preferably C1-C3-alkyl; preferably R2’ is phenyl or thienyl, R2’being substituted with one or two R21’. Most preferably R2is methyl and R2’is 5-methylthienyl or dimethyl phenyl. It is preferred that each n is independently, same or different from each other, an integer from 1 to 3, such as 1, 2 or 3. Preferably, the R3and R4substituents of the respective phenyl ring are in the 3-, 4-, and / or 5-position of the ring, whereby the 1-position is attached to the indenyl ring. It is for example possible that the phenyl ring is substituted in the para position i.e. 4 position only, like 4-tert-butyl phenyl, or di-substituted in the meta positions, i.e.3 and 5 position, like 3,5-dimethylphenyl or 3,5-ditert-butylphenyl. Furthermore, it is possible that each of the phenyl rings have the same substitution pattern or that the two phenyl rings carrying the R3and R4substituents have different substitution patterns. It is therefore preferred when n is 1, the only R3and / or R4group, respectively, is preferably in the para position. If n is 2, then the two R3and / or R4groups, respectively are preferably in the meta positions. As noted above, R3and R4are each independently, H or C1-C20-hydrocarbyl (e.g. C1-C10- hydrocarbyl) or –OR31, wherein R31is C1-C10-hydrocarbyl, whereby at least one R3and at least one R4is not hydrogen. Preferably R3and R4are each independently, same or different from each other, H, linear or branched C1-C6-alkyl, C7-C10-arylalkyl, C7-C10- alkylaryl, or C6-C20-aryl (e.g. C6-C10-aryl), or –OR31, wherein R31is C1-C10-hydrocarbyl,, whereby at least one R3per phenyl group and at least one R4is not H; more preferably R3and R4are each independently, same or different from each other, H, linear or branched C1-C6-alkyl, or C6-C20-aryl (e.g. C6-C10-aryl), even more preferably H, linear or branched C1-C4-alkyl, or -OR31, with R31being C1-C4-hydrocarbyl, yet more preferably, each R3and R4are each independently, same or different from each other, H, methyl, ethyl, isopropyl, tert-butyl, or methoxy, especially hydrogen, methyl, or tert-butyl, in particular methyl, whereby at least one R3and at least one R4is not H. L is preferably O. Preferably R51and R51’ are each independently, same or different from each other, linear or branched C1-C6-alkyl, such as methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, sec-butyl, or tert-butyl C7-C10-arylalkyl, C7-C10-alkylaryl, or C6-C10-aryl, more preferably linear C1-C6- alkyl, branched C3-C6-alkyl, or C6-aryl, even more preferably linear C1-C4alkyl, yet even more preferably methyl or ethyl, and most preferably methyl. It is preferred that R51and R51’ are the same. Most preferably, both R51and R51’ are methyl. Preferably R6and R6’ are each independently, same or different from each other, C(R61)3, with R61’being linear C1-C3-alkyl; more preferably methyl. It is preferred that R6and R6’ are the same. Advantageously, both R6and R6’ are tert-butyl. Viewed from another aspect the invention provides a metallocene catalyst complex of formula (I-a) (I-a) wherein Mt is Zr or Hf; X is a sigma ligand; R1are each independently, same or different from each other, C1-C20-hydrocarbyl, optionally containing up to two heteroatoms of Group 14-16 of the Periodic Table, or form together with the Si atom they are attached to a C4-C8-ring; R2is heteroaryl, C6-C10-aryl or linear or branched C1-C10-hydrocarbyl, whereby said C6- C10-aryl and heteroaryl are optionally substituted with 1 to 3 R21’; with R21’being C1-C10- hydrocarbyl; R2’ is heteroaryl or C6-C10-aryl, R2’being optionally substituted with one to three R21’; with R21’ being C1-C10-hydrocarbyl; n are each independently, an integer from 1 to 5; R3and R4are each independently, H or C1-C20-hydrocarbyl or –OR31, wherein R31is C1- C10-hydrocarbyl, whereby at least one R3and at least one R4is not hydrogen; R51and R51’ are each independently, same of different from each other, C1-C10- hydrocarbyl; and R6and R6’ are each independently, same or different from each other, C(R61)3, with R61 being linear or branched C1-C6-alkyl. For the above-defined metallocene complexes of formula (I-a), the following represent preferable embodiments, which can be selected alone or in combination: In a complex of formula (I-a) it is preferred if Mt is Zr or Hf, preferably Zr. Each X is a sigma ligand. Preferably, each X is independently, same or different from each other, H, halogen, C1-C6-alkoxy, or R´ group, where R´ is C1-C6-alkyl, phenyl, or benzyl. More preferably, each X is independently, same or different from each other, Cl, benzyl, or methyl. It is preferred that both X groups are the same. Most preferably both X are Cl, methyl, or benzyl, especially Cl. Preferably R1are each independently, same or different from each other, C1-C10- hydrocarbyl, more preferably C1-C10-alkyl, C4-C10-cycloalkyl, C5-C10-cycloalkyl-alkyl, C7- C10-arylalkyl, C6-C10-aryl, or C7-C10-alkylaryl, such as methyl, ethyl, propyl, isopropyl, tert- butyl, isobutyl, C3-C8-cycloalkyl, cyclohexylmethyl, phenyl, or benzyl, even more preferably both are C1-C6-alkyl, C5-C6-cycloalkyl, or C6-aryl. In an embodiment each R1is independently, same or different from each other, C1-C10-alkyl, optionally substituted with C1-C10-alkoxy. It is preferred that both R1groups are the same. Most preferably, both R1are methyl. Preferably R2is C6-aryl, heteroaryl of 5 to 6 ring members in which one ring member is O, S, or N, or CH2-R21, with R21being H, linear or branched C1-C6-alkyl, such as methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, sec-butyl, tert-butyl, more preferably R21being H or linear or branched C1-C3-alkyl, and whereby said C6-aryl and heteroaryl are optionally substituted with 1 to 3 R21’, with R21’ being C1-C6-alkyl, preferably C1-C3-alkyl. More preferably R2is phenyl, heteroaryl of 5 ring members in which one ring member is O or S, or CH2-R21, with R21being H or linear C1-C3-alkyl, such as methyl, ethyl, or n-propyl, preferably R21being H or methyl, and whereby said phenyl and heteroaryl are optionally, yet preferably, substituted with 1 or 2 R21’, with R21’ being C1-C6-alkyl, preferably R21’being C1-C3-alkyl. Even more preferably R2is phenyl, furyl, thienyl, or CH2-R21, with R21being H or C1-C3- alkyl, such as methyl, preferably R21being H, and whereby said phenyl, furyl, and thienyl are optionally, yet preferably, substituted with 1 or 2 R21’; with R21’ being methyl. Most preferably R2is phenyl substituted with 1 or 2 C1-C3-alkyl, methylfuryl, methylthienyl, such as 5-methyl-2-furyl or 5-methyl-2-thienyl, or CH2-R21, with R21being H or methyl, preferably R21being H. Advantageously R2is CH2-R21, with R21being H, linear or branched C1-C6-alkyl, such as methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, sec-butyl, tert-butyl, more preferably R21being H or linear or branched C1-C3-alkyl, even more preferably H or linear C1-C3-alkyl, such as methyl, ethyl, or n-propyl, yet more preferably H or methyl, most preferably H. Preferably R2’ is C6-aryl or heteroaryl of 5 to 6 ring members in which one ring member is O, S, or N, R2’being optionally substituted with 1 to 3 R21’; with R21’ being C1-C10- hydrocarbyl, preferably C1-C6-alkyl; more preferably R2’ is phenyl or heteroaryl of 5 ring members in which one ring member is O or S, R2’being optionally, yet preferably, substituted with 1 or 2 R21’, with R21’ being C1-C6-alkyl, preferably C1-C3-alkyl; more preferably R2’ is phenyl or thienyl, R2’being optionally substituted with 1 or 2 R21’, with R21’ being methyl. It is preferred that the R2’and / or R2aryl and heteroaryl are substituted. Advantageously the R21’substituents of the respective R2and / or R2’aryl ring are in the 3-, 4-, and / or 5- position of the ring, whereby the 1-position is attached to the indenyl ring. Further advantageously the R21’substituents of the respective R2and / or R2’heteroaryl ring are in the 3-, 4-, and / or 5-position of the ring, whereby the 2-position is attached to the indenyl ring. It is for example possible that a phenyl ring substituted in the para position i.e.3´ position only, like 4´-tert-butyl phenyl, or di-substituted in the meta positions, i.e.3´ and 5´ position, like 3´,5´-dimethylphenyl or 3´,5´-ditert-butylphenyl. Furthermore, it is possible that the phenyl ring has the same substitution pattern as the phenyl rings in the 4-position of the indenyl rings or that the phenyl rings on the 2- and 4-position have different substitution patterns. As a further example, it is possible that the heteroaryl is substituted at the position next to the heteroatom. It is therefore preferred that when R2’and / or R2is phenyl, and the phenyl is substituted with one R21’; the only R21’ group is preferably in the para position. If the R2’or R2phenyl is substituted with two R21’; then the two R21’ groups are preferably in the meta positions. It is further preferred that when R2’and / or R2is heteroaryl of 5 ring members, which is substituted with one R21’; the only R21’ group is preferably in 5´ position, whereby the 2´- position is attached to the indenyl ring. Advantageously R2is methyl and R2’is phenyl or heteroaryl of 5 ring members in which one ring member is O or S, R2’being substituted with 1 or 2 R21’, with R21’ being C1-C6- alkyl, preferably C1-C3-alkyl; preferably R2’ is phenyl or thienyl, R2’being substituted with one or two R21’. Most preferably R2is methyl and R2’is 5-methylthienyl or dimethyl phenyl. It is preferred that each n is independently, same or different from each other, an integer from 1 to 3, such as 1, 2 or 3. Preferably, the R3and R4substituents of the respective phenyl ring are in the 3-, 4-, and / or 5-position of the ring, whereby the 1-position is attached to the indenyl ring. It is for example possible that the phenyl ring substituted in the para position i.e.4 position only, like 4-tert-butyl phenyl, or di-substituted in the meta positions, i.e.3 and 5 position, like 3,5-dimethylphenyl or 3,5-ditert-butylphenyl. Furthermore, it is possible that each of the phenyl rings have the same substitution pattern or that the two phenyl rings carrying the R3and R4substituents have different substitution patterns. It is therefore preferred when n is 1, the only R3and / or R4group, respectively, is preferably in the para position. If n is 2, then the two R3and / or R4groups, respectively are preferably in the meta positions. As noted above, R3and R4are each independently, H or C1-C20-hydrocarbyl (e.g. C1-C10- hydrocarbyl) or –OR31, wherein R31is C1-C10-hydrocarbyl, whereby at least one R3and at least one R4is not hydrogen. Preferably R3and R4are each independently, same or different from each other, H, linear or branched C1-C6-alkyl, C7-C10-arylalkyl, C7-C10- alkylaryl, or C6-C20-aryl (e.g. C6-C10-aryl), or –OR31, wherein R31is C1-C10-hydrocarbyl,, whereby at least one R3per phenyl group and at least one R4is not H; more preferably R3and R4are each independently, same or different from each other, H, linear or branched C1-C6-alkyl, or C6-C20-aryl (e.g. C6-C10-aryl), even more preferably H, linear or branched C1-C4-alkyl, or -OR31, with R31being C1-C4-hydrocarbyl, yet more preferably, each R3and R4are each independently, same or different from each other, H, methyl, ethyl, isopropyl, tert-butyl, or methoxy, especially hydrogen, methyl, or tert-butyl, in particular methyl, whereby at least one R3and at least one R4is not H. Preferably R51and R51’ are each independently, same or different from each other, linear or branched C1-C6-alkyl, such as methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, sec-butyl, or tert-butyl, C7-C10-arylalkyl, C7-C10-alkylaryl, or C6-C10-aryl, more preferably linear C1-C6- alkyl, branched C3-C6-alkyl, or C6-aryl, even more preferably linear C1-C4alkyl, yet even more preferably methyl or ethyl, and most preferably methyl. It is preferred that R51and R51’ are the same. Most preferably, both R51and R51’ are methyl. Preferably R6and R6’ are each independently, same or different from each other, C(R61)3, with R61’being linear C1-C3-alkyl; more preferably methyl. It is preferred that R6and R6’ are the same. Advantageously, both R6and R6’ are tert-butyl. Viewed from another aspect the invention provides a metallocene catalyst complex of formula (I-b) wherein Mt is Zr or Hf; X is a sigma ligand; R1are each independently, same or different from each other, C1-C20-hydrocarbyl, optionally containing up to two heteroatoms of Group 14-16 of the Periodic Table, or form together with the Si atom they are attached to a C4-C8-ring; R2is linear or branched C1-C10-hydrocarbyl; R2’ is heteroaryl or C6-C10-aryl, R2’being optionally substituted with 1 to 3 R21’; with R21’ being C1-C10-hydrocarbyl; R3and R4are each independently, H, C1-C20-hydrocarbyl, or –OR31, wherein R31is C1-C10- hydrocarbyl, whereby at least one R3and at least one R4is not H; R51and R51’ are each independently, same or different from each other, C1-C10- hydrocarbyl; and R6and R6’ are each independently, same or different from each other, C(R61)3, with R61 being linear or branched C1-C6-alkyl. For the above-defined metallocene complexes of formula (I-b), the following represent preferable embodiments, which can be selected alone or in combination: In a complex of formula (I-b) it is preferred if Mt is Zr or Hf, preferably Zr. Each X is a sigma ligand. Preferably, each X is independently, same or different from each other, H, halogen, C1-C6-alkoxy, or R´ group, where R´ is C1-C6-alkyl, phenyl, or benzyl. More preferably, each X is independently, same or different from each other, Cl, benzyl, or methyl. It is preferred that both X groups are the same. Most preferably both X are Cl, methyl, or benzyl, especially Cl. Preferably R1are each independently, same or different from each other, C1-C10- hydrocarbyl, more preferably C1-C10-alkyl, C4-C10-cycloalkyl, C5-C10-cycloalkyl-alkyl, C7- C10-arylalkyl, C6-C10-aryl, or C7-C10-alkylaryl, such as methyl, ethyl, propyl, isopropyl, tert- butyl, isobutyl, C3-C8-cycloalkyl, cyclohexylmethyl, phenyl, or benzyl, even more preferably both are C1-C6-alkyl, C5-C6-cycloalkyl, or C6-aryl. In an embodiment each R1is independently, same or different from each other, C1-C10-alkyl, optionally substituted with C1-C10-alkoxy. It is preferred that both R1groups are the same. Most preferably, both R1are methyl. Advantageously R2is CH2-R21, with R21being H, linear or branched C1-6-alkyl, such as methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, sec-butyl, tert-butyl, more preferably R21being H or linear or branched C1-C3-alkyl, even more preferably H or linear C1-C3-alkyl, such as methyl, ethyl, or n-propyl, yet more preferably H or methyl, most preferably H. Preferably R2’ is C6-aryl or heteroaryl of 5 to 6 ring members in which one ring member is O, S, or N, R2’being optionally substituted with 1 to 3 R21’; with R21’ being C1-C10- hydrocarbyl, preferably C1-C6-alkyl; more preferably R2’ is phenyl or heteroaryl of 5 ring members in which one ring member is O or S, R2’being optionally, yet preferably, substituted with 1 or 2 R21’, with R21’ being C1-C6-alkyl, preferably C1-C3-alkyl; more preferably R2’ is phenyl or thienyl, R2’being optionally substituted with 1 or 2 R21’, with R21’ being methyl. It is preferred that the R2’aryl and heteroaryl groups are substituted. Advantageously the R21’substituents of the R2’aryl ring are in the 3-, 4-, and / or 5-position of the ring, whereby the 1-position is attached to the indenyl ring. Further advantageously the R21’substituents of the respective R2’heteroaryl ring are in the 3-, 4-, and / or 5-position of the ring, whereby the 2-position is attached to the indenyl ring. It is for example possible that a phenyl ring substituted in the para position i.e.4´ position only, like 4´-tert-butyl phenyl, or di-substituted in the meta positions, i.e.3´ and 5´ position, like 3,5´-dimethylphenyl or 3´,5´-ditert-butylphenyl. Furthermore, it is possible that the phenyl ring has the same substitution pattern as the phenyl rings in the 4-position of the indenyl rings or that the phenyl rings on the 2- and 4-position have different substitution patterns. As a further example, it is possible that the heteroaryl is substituted at the position next to the heteroatom. It is therefore preferred that when R2’is phenyl, which is substituted with one R21’; the only R21’ group is preferably in the para position. If the R2’phenyl is substituted with two R21’; then the two R21’ groups are preferably in the meta positions. It is further preferred that when R2’is heteroaryl of 5 ring members, which is substituted with one R21’; the only R21’ group is preferably in 5´ position, whereby the 2´-position is attached to the indenyl ring. Advantageously R2is methyl and R2’is phenyl or heteroaryl of 5 ring members in which one ring member is O or S, R2’being substituted with 1 or 2 R21’, with R21’ being C1-C6- alkyl, preferably C1-C3-alkyl; preferably R2’ is phenyl or thienyl, R2’being substituted with one or two R21’, Most preferably R2is methyl and R2’is 5-methylthienyl or dimethyl phenyl. As noted above, R3and R4are each independently, H or C1-C20-hydrocarbyl (e.g. C1-C10- hydrocarbyl) or –OR31, wherein R31is C1-C10-hydrocarbyl, whereby at least one R3and at least one R4is not hydrogen. Preferably R3and R4are each independently, same or different from each other, H, linear or branched C1-C6-alkyl, C7-C10-arylalkyl, C7-C10- alkylaryl, or C6-C20-aryl (e.g. C6-C10-aryl), or –OR31, wherein R31is C1-C10-hydrocarbyl,, whereby at least one R3per phenyl group and at least one R4is not H; more preferably R3and R4are each independently, same or different from each other, H, linear or branched C1-C6-alkyl, or C6-C20-aryl (e.g. C6-C10-aryl), even more preferably H, linear or branched C1-C4-alkyl, or -OR31, with R31being C1-C4-hydrocarbyl, yet more preferably, each R3and R4are each independently, same or different from each other, H, methyl, ethyl, isopropyl, tert-butyl, or methoxy, especially hydrogen, methyl, or tert-butyl, in particular methyl, whereby at least one R3and at least one R4is not H. Preferably, the R3and R4substituents of the respective phenyl ring are in the 3-, 4-, and / or 5-position of the ring, whereby the 1-position is attached to the indenyl ring. It is for example possible that the phenyl ring substituted in the para position i.e.3- position only, like 4-tert.-butyl phenyl, or di-substituted in the meta positions, i.e.3- and 5- position, like 3,5-dimethylphenyl or 3,5-ditert.-butylphenyl. Furthermore, it is possible that each of the phenyl rings have the same substitution pattern or that the two phenyl rings carrying the R3and R4substituents have different substitution patterns. It is therefore preferred if one or two R3and / or R4groups is H. If two R3and / or R4groups are H then the remaining R3and / or R4group, respectively, is preferably in the para position. If one R3and / or R4group is H then the remaining R3and / or R4groups are preferably in the meta positions. Advantageously one or two R3are not H, more preferably the R3are the same, like 3,5-di- methyl or 4- tert-butyl. For the second indenyl moiety preferably one or two R4on the phenyl group are not H, more preferably two R4are not H, and most preferably these two R4are the same like 3´,5´-di-methyl or 3´,5´-di-tert-butyl. Preferably R51and R51’ are each independently, same or different from each other, linear or branched C1-C6-alkyl, such as methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, sec-butyl, or tert-butyl, C7-C10-arylalkyl, C7-C10-alkylaryl, or C6-C10-aryl, more preferably linear C1-C6- alkyl, branched C3-C6-alkyl, or C6-aryl, even more preferably linear C1-C4 alkyl, yet even more preferably methyl or ethyl, and most preferably methyl. It is preferred that R51and R51’ are the same. Most preferably, both R51and R51’ are methyl. Preferably R6and R6’ are each independently, same or different from each other, C(R61)3, with R61’being linear C1-C3-alkyl; more preferably methyl. It is preferred that R6and R6’ are the same. Advantageously, both R6and R6’ are tert-butyl. Viewed from another aspect the invention provides a metallocene catalyst complex of formula (I-c) wherein Mt is Zr or Hf; X is a sigma ligand; R1are each independently, same or different from each other, C1-C20-hydrocarbyl, optionally containing up to two heteroatoms of Group 14-16 of the Periodic Table, or form together with the Si atom they are attached to a C4-C8-ring; R2is linear or branched C1-C10-hydrocarbyl; R2’ is heteroaryl or C6-C10-aryl, R2’being optionally substituted with 1 to 3 R21’; with R21’ being C1-C10-hydrocarbyl; R3and R4are each independently C1-C20-hydrocarbyl, preferably C1-C10-hydrocarbyl; R51and R51’ are each independently, same or different from each other, C1-C10- hydrocarbyl; and R6and R6’ are each independently, same or different from each other, C(R61) 61 3, with R being linear or branched C1-C6-alkyl. For the above-defined metallocene complexes of formula (I-c), the following represent preferable embodiments, which can be selected alone or in combination: In a complex of formula (I-c) it is preferred if Mt is Zr or Hf, preferably Zr. Each X is a sigma ligand. Preferably, each X is independently, same or different from each other, H, halogen, C1-C6-alkoxy, or R´ group, where R´ is C1-C6-alkyl, phenyl, or benzyl. More preferably, each X is independently, same or different from each other, Cl, benzyl, or methyl. It is preferred that both X groups are the same. Most preferably both X are Cl, methyl, or benzyl, especially Cl. Preferably R1are each independently, same or different from each other, C1-C10- hydrocarbyl, more preferably C1-C10-alkyl, C4-C10-cycloalkyl, C5-C10-cycloalkyl-alkyl, C7- C10-arylalkyl, C6-C10-aryl, or C7-C10-alkylaryl, such as methyl, ethyl, propyl, isopropyl, tert- butyl, isobutyl, C3-C8-cycloalkyl, cyclohexylmethyl, phenyl, or benzyl, even more preferably both are C1-C6-alkyl, C5-C6-cycloalkyl, or C6-aryl. In an embodiment each R1is independently, same or different from each other, C1-C10-alkyl, optionally substituted with C1-C10-alkoxy. It is preferred that both R1groups are the same. Most preferably, both R1are methyl. Advantageously R2is CH2-R21, with R21being H, linear or branched C1-6-alkyl, such as methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, sec-butyl, tert-butyl, more preferably R21being H or linear or branched C1-C3-alkyl, even more preferably H or linear C1-3-alkyl, such as methyl, ethyl, or n-propyl, yet more preferably H or methyl, most preferably H. Preferably R2’ is C6-aryl or heteroaryl of 5 to 6 ring members in which one ring member is O, S, or N, R2’being optionally substituted with 1 to 3 R21’; with R21’ being C1-C10- hydrocarbyl, preferably C1-C6-alkyl; more preferably R2’ is phenyl or heteroaryl of 5 ring members in which one ring member is O or S, R2’being optionally, yet preferably, substituted with 1 or 2 R21’, with R21’ being C1-C6-alkyl, preferably C1-C3-alkyl; more preferably R2’ is phenyl or thienyl, R2’being optionally substituted with 1 or 2 R21’, with R21’ being methyl. It is preferred that the R2’aryl and heteroaryl groups are substituted. Advantageously the R21’substituents of the R2’aryl ring are in the 3-, 4-, and / or 5-position of the ring, whereby the 1-position is attached to the indenyl ring. Further advantageously the R21’substituents of the respective R2’heteroaryl ring are in the 3-, 4-, and / or 5-position of the ring, whereby the 2-position is attached to the indenyl ring. It is for example possible that a phenyl ring substituted in the para position i.e.3´ position only, like 4´-tert-butyl phenyl, or di-substituted in the meta positions, i.e.3´ and 5´ position, like 3´,5´-dimethylphenyl or 3´,5´-ditert-butylphenyl. Furthermore, it is possible that the phenyl ring has the same substitution pattern as the phenyl rings in the 4-position of the indenyl rings or that the phenyl rings on the 2- and 4-position have different substitution patterns. As a further example, it is possible that the heteroaryl is substituted at the position next to the heteroatom. It is therefore preferred that when R2’is phenyl, which is substituted with one R21’; the only R21’ group is preferably in the para position. If the R2’phenyl is substituted with two R21’; then the two R21’ groups are preferably in the meta positions. It is further preferred that when R2’is heteroaryl of 5 ring members, which is substituted with one R21’; the only R21’ group is preferably in 5´ position, whereby the 2´-position is attached to the indenyl ring. Advantageously R2is methyl and R2’is phenyl or heteroaryl of 5 ring members in which one ring member is O or S, R2’being substituted with 1 or 2 R21’; with R21’ being C1-C6- alkyl, preferably C1-C3-alkyl; preferably R2’ is phenyl or thienyl, R2’being substituted with one or two R21’. Most preferably R2is methyl and R2’5-methylthienyl or dimethyl phenyl. As noted above, R3and R4are each independently, H or C1-C20-hydrocarbyl (e.g. C1-C10- hydrocarbyl) or –OR31, wherein R31is C1-C10-hydrocarbyl, whereby at least one R3and at least one R4is not hydrogen. Preferably R3and R4are each independently, same or different from each other, H, linear or branched C1-C6-alkyl, C7-C10-arylalkyl, C7-C10- alkylaryl, or C6-C20-aryl (e.g. C6-C10 aryl) whereby at least one R3per phenyl group and at least one R4is not H; more preferably R3and R4are each independently, same or different from each other, H, linear or branched C1-C6-alkyl, or C6-C20-aryl group (e.g. C6-C10 aryl), even more preferably H, linear or branched C1-C4-alkyl,yet more preferably, each R3and R4are each independently, same or different from each other, H, methyl, ethyl, isopropyl, or tert-butyl, especially hydrogen, methyl, or tert-butyl, in particular methyl, whereby at least one R3and at least one R4is not H. Preferably, the R3and R4substituents of the respective phenyl ring are in the 3-, 4-, and / or 5-position of the ring, whereby the 1-position is attached to the indenyl ring. It is for example possible that the phenyl ring substituted in the para position i.e.3- position only, like 4-tert.-butyl phenyl, or di-substituted in the meta positions, i.e.3- and 5-position, like 3,5-dimethylphenyl or 3,5-ditert.-butylphenyl. Furthermore, it is possible that each of the phenyl rings have the same substitution pattern or that the two phenyl rings carrying the R3and R4substituents have different substitution patterns. It is therefore preferred if one or two R3and / or R4groups is H. If two R3and / or R4groups are H then the remaining R3and / or R4group, respectively, is preferably in the para position. If one R3and / or R4group is H then the remaining R3and / or R4groups are preferably in the meta positions. Advantageously one or two R3are not H, more preferably the R3are the same, like 3,5-di- methyl or 4- tert-butyl. For the indenyl moiety preferably one or two R4on the phenyl group are not H, more preferably two R4are not H, and most preferably these two R4are the same like 3,5-di- methyl or 3,5-di-tert-butyl.Preferably R51and R51’ are each independently, same or different from each other, linear or branched C1-C6-alkyl, such as methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, sec-butyl, or tert-butyl C7-C10-arylalkyl, C7-C10-alkylaryl, or C6-C10-aryl, more preferably linear C1-C6- alkyl, branched C3-C6-alkyl, or C6-aryl, even more preferably linear C1-C4alkyl, yet even more preferably methyl or ethyl, and most preferably methyl. It is preferred that R51and R51’ are the same. Most preferably, both R51and R51’ are methyl. Preferably R6and R6’ are each independently, same or different from each other, C(R61)3, with R61’being linear C1-C3-alkyl; more preferably methyl. It is preferred that R6and R6’ are the same. Advantageously, both R6and R6’ are tert-butyl. Viewed from another aspect the invention provides a metallocene catalyst complex of formula (I-d) (I-d) wherein Mt is Zr or Hf; X is a sigma ligand; R1are each independently, same or different from each other, C1-C20-hydrocarbyl, optionally containing up to two heteroatoms of Group 14-16 of the Periodic Table, or form together with the Si atom they are attached to a C4-C8-ring; R2is linear or branched C1-C10-hydrocarbyl; R2’ is heteroaryl or C6-C10-aryl, R2’being optionally substituted with one to three R21’; with R21’ being C1-C10-hydrocarbyl; R3and R4are each independently C1-C20-hydrocarbyl, preferably C1-C10hydrocarbyl. For the above-defined metallocene complexes of formula (I-d), the following represent preferable embodiments, which can be selected alone or in combination: In a complex of formula (I-d) it is preferred if Mt is Zr or Hf, preferably Zr. Each X is a sigma ligand. Preferably, each X is independently, same or different from each other, H, halogen, C1-C6-alkoxy, or R´ group, where R´ is C1-C6-alkyl, phenyl, or benzyl. More preferably, each X is independently, same or different from each other, Cl, benzyl, or methyl. It is preferred that both X groups are the same. Most preferably both X are Cl, methyl, or benzyl, especially Cl. Preferably R1are each independently, same or different from each other, C1-C10- hydrocarbyl, more preferably C1-C10-alkyl, C4-C10-cycloalkyl, C5-C10-cycloalkyl-alkyl, C7- C10-arylalkyl, C6-C10-aryl, or C7-C10-alkylaryl, such as methyl, ethyl, propyl, isopropyl, tert- butyl, isobutyl, C3-C8-cycloalkyl, cyclohexylmethyl, phenyl, or benzyl, even more preferably both are C1-C6-alkyl, C5-C6-cycloalkyl, or C6-aryl. In an embodiment each R1is independently, same or different from each other, C1-C10-alkyl, optionally substituted with C1-C10-alkoxy. It is preferred that both R1groups are the same. Most preferably, both R1are methyl. Advantageously R2is CH2-R21, with R21being H, linear or branched C1-6-alkyl, such as methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, sec-butyl, tert-butyl, more preferably R21being H or linear or branched C1-C3-alkyl, even more preferably H or linear C1-3-alkyl, such as methyl, ethyl, or n-propyl, yet more preferably H or methyl, most preferably H; Preferably R2’ is C6-aryl or heteroaryl of 5 to 6 ring members in which one ring member is O, S, or N, R2’being optionally substituted with one to three R21’; with R21’ being C1-C10- hydrocarbyl, preferably C1-C6-alkyl; more preferably R2’ is phenyl or heteroaryl of 5 ring members in which one ring member is O or S, R2’being optionally substituted with 1 or 2 R21’; with R21’ being C1-C6-alkyl, preferably C1-C3-alkyl; more preferably R2’ is phenyl or thienyl, R2’being optionally substituted with one or two R21’, with R21’ being methyl. It is preferred that the R2’aryl and heteroaryl groups are substituted. Advantageously the R21’substituents of the R2’aryl ring are in the 3-, 4-, and / or 5-position of the ring, whereby the 1-position is attached to the indenyl ring. Further advantageously the R21’substituents of the respective R2’heteroaryl ring are in the 3-, 4-, and / or 5-position of the ring, whereby the 2-position is attached to the indenyl ring. It is for example possible that a phenyl ring substituted in the para position i.e.3´ position only, like 4´-tert-butyl phenyl, or di-substituted in the meta positions, i.e.3´ and 5´ position, like 3´,5´-dimethylphenyl or 3´,5´-ditert-butylphenyl. Furthermore, it is possible that the phenyl ring has the same substitution pattern as the phenyl rings in the 4-position of the indenyl rings or that the phenyl rings on the 2- and 4-position have different substitution patterns. As a further example, it is possible that the heteroaryl of is substituted at the position next to the heteroatom. It is therefore preferred that when R2’is phenyl, which is substituted with one R21’; the only R21’ group is preferably in the para position. If the R2’phenyl is substituted with two R21’; then the two R21’ groups are preferably in the meta positions. It is further preferred that when R2’is heteroaryl of 5 ring members, and is substituted with one R21’; the only R21’ group is preferably in 5´ position, whereby the 2´-position is attached to the indenyl ring. Advantageously R2is methyl and R2’is phenyl or heteroaryl of 5 ring members in which one ring member is O or S, R2’being substituted with 1 or 2 R21’; with R21’ being C1-C6- alkyl, preferably C1-C3-alkyl; preferably R2’ is phenyl or thienyl, R2’being substituted with one or two R21’, Most preferably R2is methyl and R2’5-methylthienyl or dimethyl phenyl. Preferably R3and R4are each independently, same or different from each other, linear C1- C6-alkyl, branched C3-C6-alkyl, or C6-C10 aryl group, more preferably linear C1-C6-alkyl, branched C3-C4-alkyl. Even more preferably, each R3and R4are each independently, same or different from each other, methyl, ethyl, isopropyl, or tert-butyl, especially methyl, or tert-butyl, particularly methyl. Advantageously the R3are the same, like 3,5-di-methyl. For the indenyl moiety preferably R4are the same like 3,5-di-methyl or 3,5-di-tert-butyl. Intermediates Whilst the invention primarily relates to catalysts, it will be appreciated that the complexes of the invention and the ligands used to form those complexes are also new. The novel indenes of the present invention bear the combination of the distinctive features of the indene framework: 1: a 5-alkoxy indene, preferably methoxy indene, with a tertiary hydrocarbyl, preferably tertiary alkyl, substituent, on position 6 and 2: an aryl or heteroaryl substituent on position 2. The present invention accordingly further relates to indenes of formula (II) wherein the dotted lines represent a double bond present in between carbons 1 and 2 or 2 and 3 of the indenyl ring; R2’ is heteroaryl or C6-C10-aryl, R2’being optionally substituted with one to three R21’; with R21’ being C1-C10-hydrocarbyl; R4are each independently, H, C1-C20-hydrocarbyl or –OR31, wherein R31is C1-C10- hydrocarbyl, whereby at least one R4is not H; R51’ is C1-C10-hydrocarbyl; and R6’ is C(R61)3, with R61being linear or branched C1-C6-alkyl. For the above-defined indenes of formula (II), the following represent preferable embodiments, which can be selected alone or in combination: Preferably R2’ is C6-aryl or heteroaryl of 5 to 6 ring members in which one ring member is O, S, or N, R2’being optionally substituted with 1 to 3 R21’, with R21’ being C1-C10- hydrocarbyl, preferably C1-C6-alkyl; more preferably R2’ is phenyl or heteroaryl of 5 ring members in which one ring member is O or S, R2’being optionally substituted with 1 or 2 R21’, with R21’ being C1-C6-alkyl, preferably C1-C3-alkyl; more preferably R2’ is phenyl or thienyl, R2’being optionally substituted with 1 or 2 R21’, with R21’ being methyl. It is preferred that the R2’aryl and heteroaryl groups are substituted. Advantageously the R21’substituents of the R2’aryl ring are in the 3-, 4-, and / or 5-position of the ring, whereby the 1-position is attached to the indenyl ring. Further advantageously the R21’substituents of the respective R2’heteroaryl ring are in the 3-, 4-, and / or 5-position of the ring, whereby the 2-position is attached to the indenyl ring. It is for example possible that a phenyl ring substituted in the para position i.e.3-position only, like 4-tert-butyl phenyl, or di-substituted in the meta positions, i.e.3- and 5- position, like 3,5-dimethylphenyl or 3,5-ditert-butylphenyl. Furthermore, it is possible that the phenyl ring has the same substitution pattern as the phenyl rings in the 4-position of the indenyl rings or that the phenyl rings on the 2- and 4-position have different substitution patterns. As a further example, it is possible that the heteroaryl of is substituted at the position next to the heteroatom. It is therefore preferred that when R2’is phenyl, which is substituted with one R21’; the only R21’ group is preferably in the para position. If the R2’phenyl is substituted with two R21’; then the two R21’ groups are preferably in the meta positions. It is further preferred that when R2’is heteroaryl of 5 ring members, and is substituted with one R21’; the only R21’ group is preferably in 5´ position, whereby the 2´-position is attached to the indenyl ring. Preferably R4are each independently, same or different from each other, H, linear or branched C1-C6-alkyl, C7-20-arylalkyl, C7-20-alkylaryl, C6-20 aryl, or –OR31, wherein R31is C1- C10-hydrocarbyl, whereby at least one R3per phenyl group and at least one R4is not H; more preferably R4are each independently, same or different from each other, H, linear or branched C1-C6-alkyl, or C6-C20 aryl group, even more preferably H, a linear or branched C1-C4-alkyl, or -OR31, wherein R31is a C1-4-hydrocarbyl; yet more preferably, R4are each independently, same or different from each other, H, methyl, ethyl, isopropyl, tert-butyl, or methoxy, especially hydrogen, methyl, or tert-butyl, whereby at least one R4is not H. Preferably, the R4substituents of the respective phenyl ring are in the 3-, 4-, and / or 5- position of the ring, whereby the 1-position is attached to the indenyl ring. It is for example possible that the phenyl ring substituted in the para position i.e.3-position only, like 4-tert.-butyl phenyl, or di-substituted in the meta positions, i.e.3- and 5-position, like 3,5-dimethylphenyl or 3,5-di-tert.-butylphenyl. It is therefore preferred if one or two R4groups is H. If two R4groups are H then the remaining R4group, respectively, is preferably in the para position. If one R4group is H then the remaining R4groups are preferably in the meta positions. For the indenyl moiety preferably one or two R4on the phenyl group are not H, more preferably two R4are not H, and most preferably these two R4are the same like 3,5-di- methyl or 3,5-di-tert-butyl.Preferably R51’ is linear or branched C1-C6-alkyl, such as methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, sec-butyl, or tert-butyl, C7-C10-arylalkyl, C7-C10-alkylaryl, or C6-C10-aryl, more preferably linear C1-C6–alkyl, branched C3-C6–alkyl, or C6-aryl, even more preferably linear C1-C4-alkyl, yet even more preferably methyl or ethyl, and most preferably methyl. Most preferably, R51’ is methyl. Preferably R6’ is C(R61)3, with R61’being linear C1-C3-alkyl; more preferably methyl. Advantageously, R6’ is tert-butyl. Synthesis The ligands required to form the complexes and hence catalysts of the invention can be synthesized by any process and the skilled organic chemist would be able to devise various synthetic protocols for the manufacture of the necessary ligand materials. For example, WO 2007 / 116034 discloses the necessary chemistry. Synthetic protocols can also generally be found in WO2002 / 02576, WO2011 / 135004, WO2012 / 084961, WO2012 / 001052, WO2011 / 076780, WO2015 / 158790, WO2018 / 122134, WO2018 / 122134, WO2019 / 179959, and WO2012 / 058740. The examples section also provides the skilled person with sufficient direction. Polymerization catalyst Viewed from a further aspect the invention provides a polymerization catalyst comprising, preferably consists of (i) a metallocene complex of formula (I); (ii) a cocatalyst comprising aluminium; and (iii) optionally a support. Catalyst Manufacture The metallocene catalysts can be used in supported or unsupported form. The particulate support material used is preferably an organic or inorganic material, such as silica, alumina or zirconia or a mixed oxide such as silica-alumina, in particular silica, alumina or silica- alumina. The use of a silica support is preferred. The skilled person is aware of the procedures required to support a metallocene catalyst. Especially preferably the support is a porous material so that the complex may be loaded into the pores of the support, e.g. using a process analogous to those described in WO94 / 14856 (Mobil), WO95 / 12622 (Borealis) and WO2006 / 097497. The particle size is not critical but is preferably in the range 5 to 200 μm, more preferably 20 to 80 μm. The use of these supports is routine in the art. Especially preferred procedures for producing such supported catalysts are those described in WO 2020 / 239598 and WO 2020 / 239603. In another embodiment, no external carrier is used but the catalyst is still presented in solid particulate form. Thus, no external support material, such as inert organic or inorganic carrier, for example silica as described above is employed. Such catalysts can be prepared as described for example in WO 2003 / 051934, WO 2014 / 060540 and WO 2019 / 179959 The particulate support material used is an inorganic porous support such as a silica, alumina or a mixed oxide such as silica-alumina, in particular silica. The use of a silica support is preferred. The complex may be loaded into the pores of the particulate support, e.g. using a process analogous to those described in W094 / 14856, W095 / 12622, W02006 / 097497 and EP18282666. The average particle size of the support such as silica support can be typically from 10 to 100 µm. However, it has turned out that special advantages can be obtained, if the support has an average particle size from 15 to 80 µm, preferably from 18 to 50 µm. The average pore size of the inorganic porous support such as silica support can be in the range from 10 to 100 nm and the pore volume from 1 to 3 mL / g. The pore diameter of the inorganic porous support such as silica support can be in the range from 20 to 40 nm. The surface area of the inorganic porous support such as silica support can be typically in the range from 100 to 400 m2 / g. Examples of suitable support materials are, for instance, ES757 produced and marketed by PQ Corporation, Sylopol 948 produced and marketed by Grace or SUNSPERA DM-L- 303 silica produced by AGC Si-Tech Co. Supports can be optionally calcined prior to the use in catalyst preparation in order to reach optimal silanol group content. The use of these supports is routine in the art. The catalyst can contain from 5 to 500 µmol, such as 10 to 100 µmol of transition metal of the metallocene per gram of support such as silica, and 3 to 15 mmol of Al per gram of support such as silica. A polymerization catalyst containing such metallocenes may be produced by a process including the steps of P1-a) combining the porous inorganic support with a first portion of the aluminoxane cocatalyst in a hydrocarbon solvent to obtain aluminoxane cocatalyst treated support, optionally followed by thermal treatment of the aluminoxane treated support; P1-b) dissolving the metallocene complex in a hydrocarbon solvent, preferably an aromatic solvent, more preferably toluene, optionally adding a second portion of the aluminoxane cocatalyst in the hydrocarbon solvent optionally the boron containing cocatalyst wherein the amount of the first portion of the aluminoxane cocatalyst added in step a) is 75.0 to 100.0 wt% of the total amount of aluminoxane cocatalyst and the amount the second portion of the aluminoxane cocatalyst added in step b) is 0.0 to 25.0 wt% of the total amount of aluminoxane cocatalyst and the boron containing cocatalyst, when present, is added in an amount that a boron / M molar ratio of feed amounts in the range of 0.1 :1 to 10:1 is reached;; P1-c) adding the solution obtained in step b) to the aluminoxane cocatalyst treated support obtained in step a) and optionally P1-d) drying the so obtained supported catalyst system. In step P1-b) of the process, the components can be mixed in any order. The optional boron containing cocatalyst can be mixed with the metallocene complex dissolved in the hydrocarbon solvent and followed by addition the optional aluminoxane, or the metallocene complex dissolved in the hydrocarbon solvent can be mixed with the optional aluminoxane and a hydrocarbon followed by addition of boron containing cocatalyst and so on. In some embodiments, all components might be combined simultaneously. Only one impregnation step is used, i.e. the treated support of step a) is loaded only in one step with the metallocene. In a preferred aspect of the present invention the process comprises P2-a) combining the porous inorganic support with aluminoxane cocatalyst in a hydrocarbon solvent to obtain aluminoxane cocatalyst treated support, optionally followed by thermal treatment of the aluminoxane treated support, filtering off the hydrocarbon solvent, optionally washing with an aromatic solvent, repeating the filtration and washing steps to remove unreacted aluminium compounds; drying the final aluminoxane cocatalyst treated support; P2-b) dissolving the metallocene in a hydrocarbon solvent optionally adding a methylaluminoxane cocatalyst in a hydrocarbon solvent, wherein the amount of methylaluminoxane cocatalyst added in step a) is 75.0 to 100.0 wt% of the total amount of methylaluminoxane cocatalyst and the amount of aluminoxane cocatalyst added in step b) is 0.0 to 25.0 wt% of the total amount of methylaluminoxane cocatalyst, to obtain a metallocene solution optionally comprising aluminoxane cocatalyst; P2-c) adding the metallocene solution to the aluminoxane cocatalyst treated support obtained in step a) and optionally P2-d) drying the so obtained supported catalyst system. If desired, the obtained supported catalyst system may be provided as an oil slurry with a desired solid content. The solid catalyst content in the slurry may be e.g. up to 30 wt%, like up to 25 wt%. The amounts of support, aluminoxane, preferably MAO, boron containing cocatalyst and metallocene depend on the desired herein defined ratios (boron / M, Al / M, Al / SiO2, M / SiO2). Cocatalyst To form an active catalytic species it is normally necessary to employ a cocatalyst as is well known in the art. Cocatalysts comprising one or more compounds of Group 13 metals, like organoaluminium, organoboron, and / or borate compounds used to activate metallocene catalysts are suitable for use in this invention. According to the present invention a cocatalyst system comprising a boron containing cocatalyst and / or an aluminoxane cocatalyst may be used in combination with the above defined metallocene catalyst complex. Preferably only cocatalysts comprising aluminium, like organoaluminium compounds used to activate metallocene catalysts, are utilized in this invention. In a preferred aspect of the present invention a cocatalyst system comprising an aluminoxane cocatalyst is advantageously used in combination with the above defined metallocene catalyst complex. Thus, preferably no further cocatalysts comprising one or more compounds of Group 13 metals other than aluminium, like organoboron and / or borate compounds, used to activate metallocene catalysts are comprised in the polymerization catalyst. Suitable amounts of cocatalyst will be well known to the person skilled in the art. Preferably, the amount of cocatalyst is chosen to reach below defined molar ratios. The molar ratio of Al from the aluminoxane to the metal ion (Mt) (preferably zirconium) of the metallocene Al / Mt may be in the range 10:1 to 2000:1 mol / mol, preferably 50:1 to 1000:1, and more preferably 100:1 to 600:1 mol / mol. When a boron cocatalyst is used, the molar ratio of boron (B) to the metal ion (Mt) (preferably zirconium) of the metallocene B / Mt may be in the range 0.1:1 to 10:1 mol / mol, preferably 0.3:1 to 7:1, especially 0.5:1 to 3:1 mol / mol. Even more preferably, the molar ratio of feed amounts of boron (B) to metal ion (Mt), preferably zirconium, of the metallocene B / Mt is from 0.5:1 to 2:1 Alumoxane cocatalyst The aluminoxane cocatalyst can be one of formula (A): where n is usually from 6 to 20 and R has the meaning below. Aluminoxanes are formed on partial hydrolysis of organoaluminum compounds, for example those of the formula AlR3, AlR2Y and Al2R3Y3 where R can be, for example, C1- C10-alkyl, preferably C1-C5-alkyl, or C3-C10-cycloalkyl, C7-C12-arylalkyl or -alkylaryl and / or phenyl or naphthyl, and where Y can be hydrogen, halogen, preferably chlorine or bromine, or C1-C10-alkoxy, preferably methoxy or ethoxy. The resulting oxygen-containing aluminoxanes are not in general pure compounds but mixtures of oligomers of the formula (A). The preferred aluminoxane is methylaluminoxane (MAO). Since the aluminoxanes used according to the invention as cocatalysts are not, owing to their mode of preparation, pure compounds, the molarity of aluminoxane solutions hereinafter is based on their aluminium content. Boron containing cocatalyst According to the present invention, the aluminoxane cocatalyst can be used in combination with a boron containing cocatalyst. It will be appreciated by the person skilled in the art that where boron based cocatalysts are employed, it is normal to pre-alkylate the complex by reaction thereof with an aluminium alkyl compound, such as TIBA. This procedure is well known and any suitable aluminium alkyl, e.g. Al(C1-C6alkyl)3can be used. Preferred aluminium alkyl compounds are triethylaluminium, tri-isobutylaluminium, tri-isohexylaluminium, tri-n-octylaluminium and tri-isooctylaluminium. Alternatively, when a borate cocatalyst is used, the metallocene complex is in its alkylated version, that is for example a dimethyl or dibenzyl metallocene complex can be used. Boron containing cocatalysts of interest include those of formula (B) BY3(B) wherein Y is the same or different and is a hydrogen atom, C1-10-haloalkyl, or C6-C20- haloaryl, or fluorine, chlorine, bromine or iodine. Preferred examples for Y are fluorine, trifluoromethyl, unsaturated groups such as haloaryl like p-fluorophenyl, 3,5-difluorophenyl, pentachlorophenyl, pentafluorophenyl, 3,4,5-trifluorophenyl and 3,5-di(trifluoromethyl)phenyl. Most preferably, Y are fluorine, trifluoromethyl, aromatic fluorinated groups such as p- fluorophenyl, 3,5-difluorophenyl, pentafluorophenyl, 3,4,5-trifluorophenyl and 3,5- di(trifluoromethyl)phenyl. Preferred boron containing cocatalysts of formula (B) are trifluoroborane, tris(4- fluorophenyl)borane, tris(3,5-difluorophenyl)borane, tris(2,4,6-trifluorophenyl)borane, tris(penta-fluorophenyl)borane, and / or tris(3,4,5-trifluorophenyl)borane. Particular preference is given to tris(pentafluorophenyl)borane. However it is preferred that borates are used, i.e. compounds containing a borate anion. These compounds have formula (C): Z4B–-W+(C) wherein Z is a substituted phenyl derivative, said substituent being halo-C1-C6-alkyl or halogen; and W+is a cationic counterion. Preferably the substituents of Z are are fluoro or trifluoromethyl. Most preferably, the phenyl group is perfluorinated. The borate anion Z4B–is preferably a weakly-coordinating anion such as tetrakis(pentafluorophenyl)borate. Suitable cationic counterions W+are triarylcarbenium such as triphenylcarbenium or protonated amine or aniline derivatives such as methylammonium, anilinium, dimethylammonium, diethylammonium, N- methylanilinium, diphenylammonium, N,N-dimethylanilinium, trimethylammonium, triethylammonium, tri-n- butylammonium, methyldiphenylammonium, pyridinium, p-bromo-N,N- dimethylanilinium or p-nitro-N,N-dimethylanilinium. Preferred ionic compounds which can be used according to the present invention include: tributylammoniumtetra(pentafluorophenyl)borate, tributylammoniumtetra(trifluoromethylphenyl)borate, tributylammoniumtetra(4-fluorophenyl)borate, N,N-dimethylcyclohexylammoniumtetrakis(pentafluorophenyl)borate, N,N-dimethylbenzylammoniumtetrakis(pentafluorophenyl)borate, N,N-dimethylaniliniumtetrakis(pentafluorophenyl)borate, N,N-di(propyl)ammoniumtetrakis(pentafluorophenyl)borate, di(cyclohexyl)ammoniumtetrakist(pentafluorophenyl)borate, triphenylcarbeniumtetrakis(pentafluorophenyl)borate, or ferroceniumtetrakis(pentafluorophenyl)borate. Preference is given to triphenylcarbeniumtetrakis(pentafluorophenyl) borate, N,N- dimethylcyclohexylammoniumtetrakis(pentafluorophenyl)borate or N,N- dimethylbenzylammoniumtetrakis(pentafluorophenyl)borate. Mostly preferred are triphenylcarbeniumtetrakis(pentafluorophenyl) borate, N,N-dimethylaniliniumtetrakis(pentafluorophenyl)borate, N,N- dimethylcyclohexylammoniumtetrakis(pentafluorophenyl)borate, or N,N- dimethylbenzylammoniumtetrakis(pentafluorophenyl)borate. Polymerization The catalysts according to the invention are suitable for the production of propylene homopolymers, propylene-ethylene copolymers or propylene C4-10 alpha olefin copolymers, in particular heterophasic polypropylene and propylene-ethylene copolymers. Accordingly, the present disclosure relates to a process for producing a propylene homopolymer, a propylene random copolymer or a heterophasic propylene copolymer using the specific catalyst system, as defined before. The ethylene content in such a propylene-ethylene polymer may vary depending on the desired properties of the polymer. Typically, ethylene content will range from 0.1 to 10 mol%. Especially, the catalysts of the present invention are used to manufacture propylene homopolymers or propylene copolymers with ethylene as comonomer and propylene copolymers with butene as a comonomer. Thus, the present invention relates to a process for the polymerization of propylene, propylene and ethylene, or propylene and a C4-10 alpha olefin in the presence of a polymerization catalyst as described herein. In an preferred aspect the present invention relates to a process for the preparation of a heterophasic polypropylene copolymer (hPP) comprising (I) polymerizing propylene in bulk in the presence of a polymerization catalyst as defined herein to form a polypropylene homopolymer matrix; (II) in the presence of said matrix and said polymerization catalyst and in the gas phase, polymerizing propylene and ethylene to form a heterophasic polypropylene copolymer comprising a homopolymer matrix and an ethylene propylene rubber. In a further aspect the present invention relates to a process for the preparation of a heterophasic polypropylene copolymer comprising (I) polymerizing propylene in bulk in the presence of polymerization catalyst as defined herein to form a polypropylene homopolymer; (II) in the presence of said homopolymer and said polymerization catalyst and in the gas phase, polymerizing propylene to form a polypropylene homopolymer matrix; (III) in the presence said matrix and said polymerization catalyst and in the gas phase, polymerizing propylene and ethylene to form a heterophasic polypropylene copolymer comprising a homopolymer matrix and an ethylene propylene rubber (EPR). Polymerization in the method of the invention may be effected in one or more, e.g.1, 2, or 3, polymerization reactors, using conventional polymerization techniques, e.g. gas phase, solution phase, slurry or bulk polymerization, or combinations thereof, like a combination of a slurry and at least one gas phase reactor. The process may also involve an in-line pre-polymerization step. This pre-polymerization step is a conventional step used routinely in polyolefin production plants and can be carried out in a continuously stirred tank reactor (CSTR) or a loop reactor, from which the prepolymerized catalyst is then transferred together with the liquid monomer(s) into the main loop reactor. Prepolymerization can be carried out at temperatures between -10 °C and 50 °C, preferably between 10 °C and 40 °C. In case of propylene polymerization in slurry reactors, like a liquid loop reactor, the reaction temperature will generally be in the range 60 to 110 °C (e.g. 60 to 90 °C), the reactor pressure will generally be in the range 5 to 80 bar -g(e.g.20 to 60 bar-g), and the residence time will generally be in the range 0.3 to 5 hours (e.g. 0.5 to 2 hours). The liquefied monomer is usually used as reaction medium. It is a particular feature of the invention that polymerization takes place at temperatures of at least 60 °C. For gas phase reactors, the reaction temperature used will generally be in the range 60 to 115 °C (e.g.70 to 110 °C), the reactor pressure will generally be in the range 10 to 30 bar- g (e.g.15 to 25 bar-g), and the residence time will generally be 0.5 to 8 hours (e.g.0.5 to 4 hours). The gas used will be the monomer optionally as mixture with a non-reactive gas such as nitrogen or propane. In addition to actual polymerization steps and reactors, the process can contain any additional polymerization steps, like a pre-polymerization step, and any further after reactor handling steps as known in the art. For solution polymerization, an aliphatic or aromatic solvent can be used to dissolve the monomer and the polymer, and the polymerization temperature will generally be in the range 80 to 200 °C (e.g.90 to 150 °C) Generally, the quantity of catalyst used will depend upon the nature of the catalyst, the reactor types and conditions and the properties desired for the polymer product. As is well known in the art hydrogen can be used for controlling the molecular weight of the polymer. The metallocene catalysts of the invention possess excellent catalyst activity and good comonomer response. The catalysts are also able to provide polymers of high weight average molecular weight Mw and narrow polydispersity Mw / Mn. Moreover, the random copolymerization behavior of metallocene catalysts of the invention shows a reduced tendency of chain transfer to ethylene. It is a feature of the invention that the claimed catalysts enable the formation of polypropylene with very high melting point. These features can be achieved at commercially interesting polymerization temperatures, e.g.60 °C or more, such as from 60 °C to 90 °C. The polydispersity index (Mw / Mn) of the polymers depend on the polymerization conditions in each reactor, and can be between 2.0 and 7.0. In a particular embodiment, the propylene polymers obtained using the catalysts of the invention have a narrow polydispersity index (Mw / Mn), between 2.0 and 4.0. Propylene homopolymers Propylene homopolymers made by catalyst system comprising the metallocenes of the invention can be made with Mw (weight average molecular weight) values in the range of 40 to 2000 kg / mol, preferably in the range of 50 to 1500 kg / mol depending on the use and amount of hydrogen used as Mw regulating agent. The catalysts of the invention enable the formation of polypropylene homopolymers with very high melting points. In a preferred embodiment the propylene homopolymer formed by the process of the invention has a melting point of more than 157 °C, preferably more than 158 °C. Propylene homopolymers having melting points up to 160 °C, or even up to 162 °C, are possible. Propylene copolymers Propylene copolymers with ethylene or with C4-C10 alpha olefin comonomers made by the metallocenes of the invention can be made with high productivity and low solubles. The polymers made by the catalysts of the description are useful in all kinds of end articles such as pipes, films (cast, blown or BOPP films, such as for example BOPP for capacitor film), fibers (such as spun-bond and melt-blown fibers), moulded articles (e.g. injection moulded, blow moulded, rotomoulded articles), extrusion coatings and so on. The invention will now be illustrated by reference to the following non-limiting Examples. EXAMPLES Measurement methods Al, B and Zr determination (ICP-method) In a glovebox, an aliquot of the catalyst (ca.40 mg) was weighed into glass weighting boat using analytical balance. The sample was then allowed to be exposed to air overnight while being placed in a steel secondary container equipped with an air intake. Then 5 mL of concentrated (65 %) nitric acid was used to rinse the content of the boat into the Xpress microwave oven vessel (20 mL). A sample was then subjected to a microwave-assisted digestion using MARS 6 laboratory microwave unit over 35 minutes at 150 °C. The digested sample was allowed to cool down for at least 4 h and then was transferred into a glass volumetric glass flask of 100 mL volume. Standard solutions containing 1000 mg / L Y and Rh (0.4 mL) were added. The flask was then filled up with distilled water and shaken well. The solution was filtered through 0.45 µm Nylon syringe filters and then subjected to analysis using Thermo iCAP 6300 ICP-OES and iTEVA software. The instrument was calibrated for Al, B, Hf, Mg, Ti and Zr using a blank (a solution of 5 % HNO3) and six standards of 0.005 mg / L, 0.01 mg / L, 0.1 mg / L, 1 mg / L, 10 mg / L and 100 mg / L of Al, B, Hf, Mg, Ti and Zr in solutions of 5 % HNO3distilled water. However, not every calibration point was used for each wavelength. Each calibration solution contained 4 mg / L of Y and Rh standards. Al 394.401 nm was calibrated using the following calibration points: blank, 0.1 mg / L, 1 mg / L, 10 mg / L and 100 mg / L. Al 167.079 nm was calibrated as Al 394.401 nm excluding 100 mg / L and Zr 339.198 nm using the standards of blank, 0.01 mg / L, 0.1 mg / L, 1 mg / L, 10 mg / L and 100 mg / L. Curvilinear fitting and 1 / concentration weighting was used for the calibration curves. Immediately before analysis the calibration was verified and adjusted (instrument reslope function) using the blank and a 10 mg / L Al, B, Hf, Mg, Ti and Zr standard which had 4 mg / L Y and Rh. A quality control sample (QC: 1 mg / L Al, Au, Be, Hg & Se; 2 mg / L Hf & Zr, 2.5 mg / L As, B, Cd, Co, Cr, Mo, Ni, P, Sb, Sn & V; 4 mg / L Rh & Y; 5 mg / L Ca, K, Mg, Mn, Na & Ti; 10 mg / L Cu, Pb and Zn; 25 mg / L Fe and 37.5 mg / L Ca in a solution of 5 % HNO3 in distilled water) was run to confirm the reslope for Al, B, Hf, Mg, Ti and Zr. The QC sample was also run at the end of a scheduled analysis set. The content for Zr was monitored using Zr 339.198 nm {99} line. The content of aluminium was monitored via the 167.079 nm {502} line, when Al concentration in test portion was under 2 wt % and via the 394.401 nm {85} line for Al concentrations above 2 wt%. Y 371.030 nm {91} was used as internal standard for Zr 339.198 nm and Al 394.401 nm and Y 224.306 nm {450} for Al 167.079 nm. The content for B was monitored using B 249 nm line. The reported values were back calculated to the original catalyst sample using the original mass of the catalyst aliquot and the dilution volume. Catalyst Activity The catalyst activity is calculated on the basis of the following formula: amount of polymer produced (kg) Catalyst Activity (kg-PP / g-Cat / h) = catalyst loading (g) × polymerization time (h) The catalyst productivity is calculated on the basis of the following formula: amount of polymer produced (kg) Catalyst productivity (kg-PP / g-Cat) = catalyst loading (g) Polymer powder bulk density Instruments: Electronic balance: Range from 0,1g-11000g Graduated glass cylinder: Volume = max.250ml Plastic spoon: Volume=125ml Plastic funnel: D=105mm Execution: A glass cylinder is filled up to a volume of 250 ml by pouring in the unstabilised polymer powder, using a plastic spoon and a plastic funnel. Calculation: Mass of polymer (g) / measured volume (ml) XS The xylene soluble fraction (XS) as defined and described in the present invention is determined in line with ISO 16152 as follows: 2.5±0.1 g of the polymer were dissolved in 250 ml o-xylene under reflux conditions and continuous stirring, under nitrogen atmosphere. After 30 minutes, the solution was allowed to cool, first for 15 minutes at ambient temperature and then maintained for 30 minutes under controlled conditions at 25 ± 0.5 °C. The solution was filtered through filter paper. For determination of the xylene soluble content, an aliquot (100 ml) of the filtrate was taken. This aliquot was evaporated in nitrogen flow and the residue dried under vacuum at 100 °C until constant weight is reached. The xylene soluble fraction (weight percent) can then be determined as follows: XS% = (100 x m1x v0) / (m0x v1), wherein m0designates the initial polymer amount (grams), m1defines the weight of residue (grams), v0defines the initial volume (milliliter) and v1defines the volume of the analyzed sample (milliliter). To obtain the amorphous copolymer fraction for further characterization with GPC and NMR, the remaining xylene soluble filtrate was precipitated with acetone. The precipitated polymer was filtered and dried in the vacuum oven at 100 °C to constant weight. GPC: Molecular weight averages, molecular weight distribution, and polydispersity index (Mn, Mw, Mw / Mn) The MWD and the corresponded molecular weight averages Mn, Mw, Mv and Mz of the polymer sample were determined by using Gel Permeation Chromatography (GPC) at 160°C. All samples were integrated at the low Mw end up to the 3rdlast calibration point of the calibration curve (PS = 1820 g / mol ~ 1340 g / mol PP equivalent). A high temperature GPC equipped with a suitable concentration detector (like IR5 or IR4 from PolymerChar (Valencia, Spain), an online four capillary bridge viscometer (PL-BV 400-HT), and a dual light scattering detector (PL-LS 15 / 90 light scattering detector) with a 15° and 90° angle was used. 3x Olexis and 1x Olexis Guard columns from Agilent as stationary phase and 1,2,4-trichlorobenzene (TCB, stabilized with 250 mg / L 2,6-Di tert butyl-4-methyl-phenol) as mobile phase at 160 °C and at a constant flow rate of 1 mL / min was applied. 200 μL of sample solution were injected per analysis. All samples were prepared by dissolving 8.0 – 10.0 mg of polymer in 10 mL (at 160 °C) of stabilized TCB (same as mobile phase) for 2,5 hours at 160°C under continuous gentle shaking. The injected concentration of the polymer solution at 160 °C (c160°C) was determined in the following way. 0,8772 With: w25(polymer weight) and V25(Volume of TCB at 25°C). The column set was calibrated using universal calibration (according to ISO 16014-2:2019) with 19 narrow MWD polystyrene (PS) standards in the range of 0.5 kg / mol to 11500 kg / mol. The PS standards were dissolved at 160°C for 15 min or alternatively at room temperatures at a concentration of 0.2 mg / ml for molecular weight higher and equal 899 kg / mol and at a concentration of 1 mg / ml for molecular weight below 899 kg / mol. The conversion of the polystyrene peak molecular weight to polypropylene molecular weights is accomplished by using the Mark Houwink equation and the following Mark Houwink constants: KPS= 19 x 10-5ml / g, αPS= 0.655 KPP= 39 x 10-5ml / g, αPP= 0.725 A third order polynomial fit was used to fit the calibration data. All samples were prepared in the concentration range of 0.5 -1 mg / ml and dissolved at 160 °C for 3 hours under continuous gentle shaking Molecular weight averages (Mn, Mw, Mv and Mz), Molecular weight distribution (MWD) and its broadness, described by the polydispersity index PD= Mw / Mn (wherein Mn is the number average molecular weight and Mw is the weight average molecular weight) were determined using the following formulas: The DSC curves and data have been produced on a DSC Q200 TA Instrument, by placing a 5-7 mg sample cut from the polymer MFR string, into a closed DSC aluminum pan, heating the sample from -10 °C to 225 °C at 10 °C / min, holding for 10 min at 225 °C, cooling from 225 °C to –30 °C, holding for 5 min at –30 °C, heating from –30 °C to 225 °C at 10 °C / min. The reported Tmvalues are those of the peak of the endothermic heat flow determined from the second heating scan. Melt Flow Rate The melt flow rate (MFR) is determined according to ISO 1133 and is indicated in g / 10 min. The MFR is an indication of the flowability, and hence the processability, of the polymer. The higher the melt flow rate, the lower the molecular weight of the polymer. The MFR is determined at 230°C and may be determined at different loadings such as 2.16 kg (MFR2) or 21.6 kg (MFR21). Comonomer content by FTIR Quantitative infrared (IR) spectroscopy was used to estimate the C2 content of the copolymers through calibration to a primary method (NMR spectroscopy). Calibration was facilitated through the use of a set of in-house, non-commercial calibration standards of known C2 contents determined by quantitative13C solution-state nuclear magnetic resonance (NMR) spectroscopy. The calibration procedure was undertaken in the conventional manner well documented in the literature [Spectroscopy of Polymers, 2nd Edition, J.L. Koenig, Elsevier Science, 1999]. The calibration set consisted of 8 calibration standards with C2 contents ranging between 0.0-3.5 wt%. Quantitative FTIR spectra were recorded in the solid-state using a Bruker Vertex 70 FTIR spectrometer. Spectra were recorded on 25x25 mm square films of 300 µm thickness prepared by compression moulding at 180 - 210°C and 70 bar of pressure. Standard transmission FTIR spectroscopy was employed using a spectral range of 5000-400 cm-1, an aperture of 6 mm, a spectral resolution of 2 cm-1, 16 background scans, 16 spectrum scans, an interferogram zero filling factor of 32 and Norton Beer strong apodisation. Quantitative analysis was carried out by integration of (peak height) CH2rocking deformations at 732.5 cm-1(AQ) corresponding to isolated ethylene incorporation in PEP comonomer sequences (integration method K-OPUS, limits 759 and 702 cm-1). The quantitative band was normalized to the height of the CH combination band at 4323 cm-1(AR) corresponding to CH structural units (integration method K, limits 4480, 3950 cm-1). The C2 content in units of weight percent was then predicted from the normalized absorption (A0= AQ / AR) using a linear calibration curve. The calibration curve having previously been constructed by least square regression of the normalized absorptions and comonomer contents measured by the primary technique (NMR Spectroscopy). The typical linear calibration curve has the form: ^ = ^^× ^^+ ^^Equation 1 Here C1is the slope of the calibration curve with 0.96 > C1> 1, and the intercept of -0.02 > C0> 0.06. The quality of the calibration was assessed using the usual Confidence of Determination (COD) or R2. The COD was around 0.998. NMR Quantitative nuclear-magnetic resonance (NMR) spectroscopy was used to quantify the isotacticity and content of regio-defects of the polypropylene homopolymers. Quantitative13C{1H} NMR spectra recorded in the solution-state using a Bruker Avance III 400 NMR spectrometer operating at 400.15 and 100.62 MHz for1H and13C respectively. All spectra were recorded using a13C optimised 10 mm selective excitation probehead at 125°C using nitrogen gas for all pneumatics. Approximately 200 mg of material was dissolved in 1,2- tetrachloroethane-d2(TCE-d2). This setup was chosen primarily for the high resolution needed for tacticity distribution quantification (Busico, V., Cipullo, R., Prog. Polym. Sci.26 (2001) 443; Busico, V.; Cipullo, R., Monaco, G., Vacatello, M., Segre, A.L., Macromolecules 30 (1997) 6251). Standard single-pulse excitation was employed utilising the NOE and bi-level WALTZ16 decoupling scheme (Zhou, Z., Kuemmerle, R., Qiu, X., Redwine, D., Cong, R., Taha, A., Baugh, D. Winniford, B., J. Mag. Reson.187 (2007) 225; Busico, V., Carbonniere, P., Cipullo, R., Pellecchia, R., Severn, J., Talarico, G., Macromol. Rapid Commun. 2007, 28, 11289). A total of 6144 (6k) transients were acquired per spectra using a 3 s recycle delay. Quantitative13C{1H} NMR spectra were processed, integrated and relevant quantitative properties determined from the integrals using proprietary computer programs. All chemical shifts are internally referenced to the methyl signal of the isotactic pentad mmmm at 21.85 ppm. The tacticity distribution was quantified through integration of the methyl region between 23.6 and 19.7 ppm correcting for any sites not related to the stereo sequences of interest (Busico, V., Cipullo, R., Prog. Polym. Sci.26 (2001) 443; Busico, V., Cipullo, R., Monaco, G., Vacatello, M., Segre, A.L., Macromolecules 30 (1997) 6251). The pentad isotacticity was determined through direct integration of the methyl region and reported as either the mole fraction or percentage of isotactic pentad mmmm with respect to all steric pentads i.e. [mmmm] = mmmm / sum of all steric pentads. When appropriate integrals were corrected for the presence of sites not directly associated with steric pentads. Characteristic signals corresponding to regio irregular propene insertion were observed (Resconi, L., Cavallo, L., Fait, A., Piemontesi, F., Chem. Rev. 2000, 100, 1253). The presence of secondary inserted propene in the form of 2,1 erythro regio defects was indicated by the presence of the two methyl signals at 17.7 and 17.2 ppm and confirmed by the presence of other characteristic signals. The amount of 2,1 erythro regio defects was quantified using the average integral (e) of the e6 and e8 sites observed at 17.7 and 17.2 ppm respectively, i.e. e = 0.5 * (e6 + e8). Characteristic signals corresponding to other types of regio irregularity were not observed (Resconi, L., Cavallo, L., Fait, A., Piemontesi, F., Chem. Rev. 2000, 100, 1253). The amount of primary inserted propene (p) was quantified based on the integral of all signals in the methyl region (CH3) from 23.6 to 19.7 ppm paying attention to correct for other species included in the integral not related to primary insertion and for primary insertion signals excluded from this region such that p = CH3 + 2*e. The relative content of a specific type of regio defect was reported as the mole fraction or percentage of said regio defect with respect all observed forms of propene insertion i.e. sum of all primary (1,2), secondary (2,1) and tertiary (3,1) inserted propene units, e.g. [21e] = e / ( p + e + t + i ). The total amount of secondary inserted propene in the form of 2,1-erythro or 2,1-threo regio defects was quantified as sum of all said regio irregular units, i.e.

[0021] = [21e] + [21t]. Quantitative nuclear-magnetic resonance (NMR) spectroscopy was used to quantify the ethylene content and the isotacticity of the copolymers. Quantitative13C{1H} NMR spectra were recorded in the solution-state using a Bruker Avance III 400 NMR spectrometer operating at 400.15 and 100.62 MHz for1H and13C respectively. All spectra were recorded using a13C optimised 10 mm extended temperature probehead at 125°C using nitrogen gas for all pneumatics. Approximately 200 mg of material was dissolved in 3 ml of 1,2-tetrachloroethane-d2 (TCE-d2) along with chromium-(III)-acetylacetonate (Cr(acac)3) resulting in a 65 mM solution of relaxation agent in solvent as described in G. Singh, A. Kothari, V. Gupta, Polymer Testing 2009, 28(5), 475. To ensure a homogenous solution, after initial sample preparation in a heat block, the NMR tube was further heated in a rotatory oven for at least 1 hour. Upon insertion into the magnet the tube was spun at 10 Hz. This setup was chosen primarily for the high resolution and quantitatively needed for accurate ethylene content quantification. Standard single- pulse excitation was employed without NOE, using an optimised tip angle, 1 s recycle delay and a bi-level WALTZ16 decoupling scheme as described in Z. Zhou, R. Kuemmerle, X. Qiu, D. Redwine, R. Cong, A. Taha, D. Baugh, B. Winniford, J. Mag. Reson.187 (2007) 225 and V. Busico, P. Carbonniere, R. Cipullo, C. Pellecchia, J. Severn, G. Talarico, Macromol. Rapid Commun.2007, 28, 1128. A total of 6144 (6k) transients were acquired per spectra. Quantitative13C{1H} NMR spectra were processed, integrated and relevant quantitative properties determined from the integrals. All chemical shifts were indirectly referenced to the central methylene group of the ethylene block (EEE) at 30.00 ppm using the chemical shift of the solvent. This approach allowed comparable referencing even when this structural unit was not present. With characteristic signals corresponding to 2,1 erythro regiodefects observed (as described in L. Resconi, L. Cavallo, A. Fait, F. Piemontesi, Chem. Rev. 2000, 100 (4), 1253, in Cheng, H. N., Macromolecules 1984, 17, 1950, and in W-J. Wang and S. Zhu, Macromolecules 2000, 33, 1157) the correction for the influence of the regiodefects on determined properties was required. Characteristic signals corresponding to other types of regiodefects were not observed. Characteristic signals corresponding to the incorporation of ethylene were observed (as described in Cheng, H. N., Macromolecules 1984, 17, 1950) and the comonomer fraction calculated as the fraction of ethylene in the polymer with respect to all monomer in the polymer: fE = ( E / ( P + E ) The comonomer fraction was quantified using the method of W-J. Wang and S. Zhu, Macromolecules 2000, 33, 1157, through integration of multiple signals across the whole spectral region in the13C{1H} spectra. This method was chosen for its robust nature and ability to account for the presence of regio-defects when needed. Integral regions were slightly adjusted to increase applicability across the whole range of encountered comonomer contents. The mole percent comonomer incorporation was calculated from the mole fraction: E [mol%] = 100 * fE The weight percent comonomer incorporation was calculated from the mole fraction: E [wt%] = 100 * ( fE * 28.06 ) / ( (fE * 28.06) + ((1-fE) * 42.08) ) The isotacticity of the copolymer was determined according to known methods, for example as described in Macromolecules 2005, vol.38, pp.3054-3059. Crystex The crystalline (CF) and soluble fractions (SF) of the heterophasic propylene resins as well as the comonomer content and intrinsic viscosities of the respective fractions were analysed by the Crystex method. The crystalline and amorphous fractions are separated through temperature cycles of dissolution at 160°C, crystallization at 40°C and re- dissolution in 1,2,4-trichlorobenzene (1,2,4-TCB) at 160°C. Quantification of SF and CF and determination of ethylene content (C2) are achieved by means of an infrared detector (IR4) and an online 2-capillary viscometer is used for determination of the intrinsic viscosity (iV). IR4 detector is multiple wavelength detector detecting IR absorbance at two different bands (CH3 and CH2) for the determination of the concentration and the ethylene content in ethylene-propylene copolymers. IR4 detector is calibrated with series of EP copolymers with known ethylene content in the range of 2 wt.-% to 69 wt.-% (determined by 13C- NMR). Amount of Soluble fraction (SF) and Crystalline Fraction (CF) are correlated through the XS calibration to the “Xylene Soluble” (XS) quantity and respectively Xylene Insoluble (XI) fractions, determined according to standard gravimetric method as per ISO16152 (2005). XS calibration is achieved by testing various EP copolymers with XS content in the range 2-31 wt%. Intrinsic viscosity (iV) of the parent EP copolymer and its soluble and crystalline fractions are determined with a use of an online 2-capillary viscometer and are correlated to corresponding iV determined in decalin according to ISO 1628-3 (2010). Calibration is achieved with several commercial EP PP copolymers with iV = 2-4 dL / g. A sample of the PP composition to be analysed is weighed out in concentrations of 10mg / ml to 20mg / ml. After automated filling of the vial with 1,2,4-TCB containing 250 mg / l 2,6-tert-butyl-4-methylphenol (BHT) as antioxidant, the sample is dissolved at 160°C until complete dissolution is achieved, usually for 60 min, with constant stirring of 800rpm. A defined volume of the sample solution is injected into the column filled with inert support where the crystallization of the sample and separation of the soluble fraction from the crystalline part is taking place. This process is repeated two times. During the first injection the whole sample is measured at elevated temperature, determining the iV[dl / g] and the C2[wt%] of the PP composition. During the second injection the soluble fraction (at low temperature) and the crystalline fraction (at elevated temperature) with the crystallization cycle are determined (wt% SF, wt% C2, iV). Metallocene synthesis Synthesis of MC-CE1 Synthesis of this metallocene has been carried out as described in WO2018091684 MC- IE1. Synthesis of MC-IE1, IE2, IE3, IE4 Synthesis of the common intermediate 2-bromo-5-tert-butyl-7-(3,5-dimethylphenyl)-6- methoxy-1H-indene. 4-(Bromomethyl)-1-tert-butyl-2-methoxybenzene A mixture of 155.5 g (0.872 mol) of 1-tert-butyl-2-methoxy-4-methylbenzene, 1.0 g of benzoyl peroxide, 800 ml of CCl4, and 155.5 g (0.873 mol) of NBS was refluxed for 2 h. The resulting mixture was cooled to room temperature, filtered through glass frit (G3), and the filtrate was evaporated to dryness. Fractional rectification of the residue gave 159.2 g (71.0%, purity ca.80%) of 4-(bromomethyl)-1-tert-butyl-2-methoxybenzene as a colorless liquid, b.p.105-120 °C / 3 mm Hg.1H NMR (CDCl3): δ 7.22 (d, J = 7.8 Hz, 1H), 6.93-6.87 (m, 2H), 4.47 (s, 2H), 3.84 (s, 3H), 1.35 (s, 9H). 13C NMR (CDCl3): δ 158.62, 138.73, 136.40, 126.85, 120.73, 111.99, 54.96, 34.78, 33.76, 29.59. Dimethyl (4-tert-butyl-3-methoxybenzyl)malonate Diethyl malonate (335 g, 2.09 mol, 2.01 equiv.) was added to a solution of sodium methoxide obtained from 25.2 g (1.1 mol, 1.05 equiv.) of sodium and 1000 ml of dry methanol. This mixture was stirred for 10 min, then 4-(bromomethyl)-1-tert-butyl-2- methoxybenzene (268.1 g, 1.04 mol) was added dropwise in 1 h. The resulting mixture was refluxed for 4 h, then most of the methanol was distilled off. Water (1000 ml) was added to this residue, then the obtained orange mixture was extracted with 3 ^300 ml of dichloromethane. The combined extract was dried over Na2SO4and then evaporated to dryness. The crude product was distilled under reduced pressure to give 239.4 g (74.7%) of dimethyl (4-tert-butyl-3-methoxybenzyl)malonate as a colorless oil, b.p. 145–195°C / 3 mm Hg.1H NMR (CDCl3): δ 7.16 (d, J = 8.4 Hz, 1H), 6.74-6.68 (m, 2H), 3.80 (s, 3H), 3.71 (s, 6H), 3.69 (t, J = 7.7 Hz, 1H), 3.19 (d, J = 7.7 Hz, 2H), 1.34 (s, 9H). 3-(4-tert-Butyl-3-methoxyphenyl)propanoic acid A solution of 140 g (2.5 mol) of KOH in 200 ml of water was added dropwise to a rapidly stirred mixture of 239.4 g (776.3 mol) of dimethyl (4-tert-butyl-3-methoxybenzyl)malonate and 200 ml of ethanol. The obtained mixture was refluxed for 6 h to saponificate the ester. Ethanol, methanol and water were distilled off until distillation temperature reached 95 °C, and then 2000 ml of water and 12 M HCl (to pH 1) were added to the residue. The formed substituted malonic acid was extracted with 1000 ml of ether, the organic extract was evaporated to dryness, and the residue was decarboxylated at 200 °C. This procedure gave 182.5 g (ca. 100%) of 3-(4-tert-butyl-3-methoxyphenyl)propanoic acid as a light- brown oil which completely crystallized upon standing at room temperature.1H NMR (CDCl3): δ 11.5 (very br.s, 1H), 7.19 (d, J = 7.7 Hz, 1H), 6.76-6.70 (m, 2H), 3.82 (s, 3H), 2.93 (t, J = 7.8 Hz, 2H), 2.69 (t, J = 7.8 Hz, 2H), 1.35 (s, 9H).13C NMR (CDCl3): δ 179.54, 158.51, 138.99, 136.28, 126.64, 119.74, 111.65, 54.93, 35.57, 34.53, 30.25, 29.70. 6-tert-Butyl-5-methoxyindan-1-one 3-(4-tert-butyl-3-methoxyphenyl)propanoic acid (143.5 g, 607.3 mmol) was added in several portions to Eaton’s reagent obtained from 135 g of P4O10and 680 ml of MeSO3H, cooled to 5 °C. This mixture was stirred overnight at room temperature. The dark red solution was poured into a mixture of 2 kg of ice and 1 L of water, and the resulting mixture was extracted with 3 ^400 ml of dichloromethane. The combined organic extract was washed with aqueous K2CO3, dried over K2CO3, and then evaporated to dryness. The resulting dark mass was triturated with 250 ml of n-hexane overnight, then the formed precipitate was filtered off (G3). This precipitate is a mixture of 6-tert-butyl-5- methoxyindan-1-one and 5-methoxyindan-1-one. The title product was isolated by flash chromatography on silica gel 60 (40-63 µm; eluent: hexanes-dichloromethane = 1:10, then pure dichloromethane). This procedure gave 59.7 g (45.0%) of 6-tert-butyl-5- methoxyindan-1-one.1H NMR (CDCl3): δ 7.69 (s, 1H), 6.90 (s, 1H), 3.93 (s, 3H), 3.09-3.02 (m, 2H), 2.68-2.63 (m, 2H), 1.37 (s, 9H).13C NMR (CDCl3): δ 205.74, 164.46, 156.13, 138.63, 129.48, 121.69, 107.81, 55.17, 36.40, 34.98, 29.50, 25.40. 4-Bromo-6-tert-butyl-5-methoxyindan-1-one A mixture of 75.5 g (345.9 mmol) of 6-tert-butyl-5-methoxyindan-1-one, 82.0 g of NaOAc, 2.5 g of Bu4NBr, 600 ml of dichloromethane, and 575 ml of water was cooled to 5 °C, then 55.2 g (345.4 mmol) of bromine was added dropwise for 5 min at this temperature. The resulting mixture was stirred 1 h at 5 °C, then 41.0 g of NaOAc and 27.6 g (172.7 mmol) of bromine were added. This mixture was stirred for 30 min at 5 °C, then the resulting mixture was washed with aqueous Na2SO3. The organic layer was separated, and the aqueous phase was additionally extracted with 2 ^200 ml of dichloromethane. The combined organic extract was evaporated to dryness. The product was isolated using flash chromatography on silica gel 60 (40-63 µm; eluent: hexanes-dichloromethane = 1:10, vol.). This procedure gave 94.07 g (89.2%) of 4-bromo-6-tert-butyl-5-methoxyindan-1-one as a dark-red oil.1H NMR (CDCl3): δ 7.71 (s, 1H), 4.03 (s, 3H), 3.05-3.00 (m, 2H), 2.73-2.67 (m, 2H), 1.41 (s, 9H).13C NMR (CDCl3): δ 205.29, 162.65, 155.41, 145.30, 133.36, 121.10, 116.58, 61.56, 36.31, 35.54, 30.51, 26.93. 6-tert-Butyl-4-(3,5-dimethylphenyl)-5-methoxyindan-1-one A mixture of 94.07 g (316.5 mmol) of 4-bromo-6-tert-butyl-5-methoxyindan-1-one, 60.0 g (400.0 mmol, 1.26 equiv.) of 3,5-dimethylphenylboronic acid, 1.7 g (3.33 mmol, 1 mol.%) of Pd(PtBu3)2, 102 g of Na2CO3, 525 ml of 2-methyltetrahydrofurane, and 470 ml of water was refluxed for 6 h. Then 100 ml of water was added, the organic layer was separated, and the aqueous layer was extracted with 500 ml of dichloromethane. The combined organic extract was dried over K2CO3and then evaporated to dryness to give a black oil. The product was isolated by flash-chromatography on silica gel 60 (40-63 µm, eluent: hexanes-dichloromethane = 1:10, vol.). Yield 102.35 g (ca.100%) of 6-tert-butyl-4-(3,5- dimethylphenyl)-5-methoxyindan-1-one as a white solid mass.1H NMR (CDCl3): δ 7.74 (s, 1H), 7.04-7.00 (m, 3H), 3.33 (s, 3H), 2.89-2.83 (m, 2H), 2.63-2.57 (m, 2H), 2.38 (s, 6H), 1.42 (s, 9H).13C NMR (CDCl3): δ 206.48, 163.39, 154.60, 143.19, 138.06, 136.11, 132.81, 131.55, 129.08, 127.11, 120.95, 60.50, 36.45, 35.32, 30.45, 25.12, 21.34. 5-tert-Butyl-7-(3,5-dimethylphenyl)-6-methoxy-1H-indene NaBH4 (18.0 g, 475.8 mmol, 1.5 equiv.) was added to a solution of 6-tert-butyl-4-(3,5- dimethylphenyl)-5-methoxyindan-1-one (102.34 g, 317.4 mmol) in 800 ml of THF cooled to 5 °C. To this mixture 250 ml of MeOH was added dropwise over ca.5 h at 5 °C, and the resulting mixture was stirred overnight at room temperature. Further on, this mixture was evaporated to dryness, 1000 ml of dichloromethane and 500 ml water were added to the residue, and thus obtained mixture was acidified with 2 M HCl to pH~6.5. The organic layer was separated, the aqueous layer was additionally extracted with 250 ml of dichloromethane. The combined organic extract was passed through a pad (~30 ml) of silica gel 60 (40-63 µm; eluent: dichloromethane) to get rid of most of the palladium black. The obtained elute was evaporated to dryness to give a reddish oil. To a solution of this oil in 1000 ml of toluene, preheated to ca.60 °C, 1.0 g of TsOH was added. This mixture was refluxed for 3 min with Dean-Stark head. Then, the reaction mixture was quickly cooled to room temperature using an ice-water bath. The formed solution was washed with 10% Na2CO3, the organic layer was separated, the aqueous layer was extracted with 200 ml of dichloromethane. The combined organic extract was dried over K2CO3and then evaporated to dryness. The crude product was purified by flash chromatography on silica gel 60 (40-63 µm, hexanes-dichloromethane = 10:1) followed by crystallization from n- hexane. This procedure gave 87.18 g (89.6%) of 5-tert-butyl-7-(3,5-dimethylphenyl)-6- methoxy-1H-indene as a colorless crystalline material.1H NMR (CDCl3): δ 7.36 (s, 1H), 7.10 (s, 2H), 6.99 (s, 1H), 6.84 (dt, J = 5.5 Hz, J = 1.9 Hz, 1H), 6.42 (dt, J = 5.5 Hz, J = 2.0 Hz, 1H), 3.27 (s, 3H), 3.21 (t, J = 2.0 Hz, 2H), 2.36 (s, 6H), 1.45 (s, 9H).13C NMR (CDCl3): δ 155.10, 142.28, 141.03, 139.57, 138.16, 137.70, 133.36, 132.00, 131.94, 128.53, 127.18, 118.14, 60.66, 39.17, 35.17, 30.97, 21.41. 2-Bromo-6-tert-butyl-4-(3,5-dimethylphenyl)-5-methoxyindan-1-ol Water (20 ml) was added to a solution of 5-tert-butyl-7-(3,5-dimethylphenyl)-6-methoxy- 1H-indene (61.29 g, 0.2 mol) in a mixture of 550 ml of DMSO and 300 ml of THF. Then, 37.38 g (210 mmol, 1.05 equiv.) of N-bromosuccinimide was added in aliquots over 90 min. After that, the obtained mixture was stirred overnight at room temperature. Then, 1200 ml of water and 600 ml of dichloromethane were added. The organic layer was separated, and the aqueous layer was additionally extracted with 2 ^150 ml of dichloromethane. The combined organic extract was washed with 6 ^1000 ml of water, dried over Na2SO4, and evaporated to dryness. The residue was dissolved in 300 ml of hexane and left for crystallization for 30 min at 5 °C. The obtained white crystals were filtered off (G3), washed with n-hexane and dried under vacuum. This procedure gave 64.89 g of the title product. The combined filtrate was evaporated to dryness, and the residue was recrystallized in the same way from 35 ml of n-hexane. This procedure gave additional 8.07 g of the title product. Thus, the total yield of 2-bromo-6-tert-butyl-4-(3,5-dimethylphenyl)-5- methoxyindan-1-ol isolated in this synthesis was 72.96 g (90.4%).1H NMR (CDCl3): δ 7.34 (s, 1H), 6.99-6.94 (2s, sum 3H), 5.29 (dd, J = 6.2 Hz, J = 6.0 Hz, 1H), 4.17 (ddd, J = 7.7 Hz, J = 7.4 Hz, J = 6.0 Hz, 1H), 3.30 (dd, J = 16.4 Hz, J = 7.4 Hz, 1H), 3.24 (s, 3H), 3.06 (dd, J = 16.4 Hz, J = 7.7 Hz, 1H), 2.40 (d, J = 6.2 Hz, 1H), 2.35 (s, 6H), 1.42 (s, 9H).13C NMR (CDCl3): δ 158.21, 142.68, 137.99, 137.83, 136.83, 135.68, 131.99, 128.82, 127.14, 121.07, 83.74, 60.37, 54.83, 39.88, 35.30, 30.73, 21.38. 2-Bromo-5-tert-butyl-7-(3,5-dimethylphenyl)-6-methoxy-1H-indene TsOH (2.0 g) was added to a solution of 2-bromo-6-tert-butyl-4-(3,5-dimethylphenyl)-5- methoxyindan-1-ol (72.96 g, 180.88 mmol) in 600 ml of toluene, preheated to ca.60 °C. This mixture was refluxed with Dean-Stark head for 7 min. Then, the reaction mixture was quickly cooled to room temperature using an ice-water bath. The formed solution was washed with 10% Na2CO3, the organic layer was separated, and the aqueous layer was extracted with 200 ml of dichloromethane. The combined organic extract was dried over K2CO3and then evaporated to dryness. The crude product was purified by flash chromatography on silica gel 60 (40-63 µm, hexanes-dichloromethane = 2:1) to give 70.51 g (ca. 100%) of 2-bromo-5-tert-butyl-7-(3,5-dimethylphenyl)-6-methoxy-1H-indene as a light-yellow glassy solid.1H NMR (CDCl3): δ 7.24 (s, 1H), 7.05 (s, 2H), 6.99 (s, 1H), 6.87 (t, J = 1.6 Hz, 1H), 3.41 (d, J = 1.6 Hz, 2H), 3.26 (s, 3H), 2.36 (s, 6H), 1.43 (s, 9H).13C NMR (CDCl3): δ 155.18, 141.55, 141.19, 138.79, 137.91, 137.46, 132.79, 131.78, 128.82, 126.95, 123.25, 117.55, 60.65, 45.50, 35.19, 30.88, 21.40. Synthesis of MC-IE1 5-tert-Butyl-2,7-bis(3,5-dimethylphenyl)-6-methoxy-1H-indene A mixture of 24.87 g (64.54 mmol) of 2-bromo-5-tert-butyl-7-(3,5-dimethylphenyl)-6- methoxy-1H-indene, 12.2 g (81.34 mmol, 1.26 equiv.) of 3,5-dimethylphenylboronic acid, 350 mg (0.685 mmol, 1 mol.%) of Pd(PtBu3)2, 20.8 g of Na2CO3, 110 ml of 2- methyltetrahydrofurane, and 100 ml of water was refluxed for 3.5 h. Then, 300 ml of water was added, the organic layer was separated, and the aqueous layer was extracted with 200 ml of dichloromethane. The combined organic extract was dried over K2CO3 and then evaporated to dryness to give a brownish solid mass. The product was isolated by flash- chromatography on silica gel 60 (40-63 µm, eluent: hexanes-dichloromethane = 10:1, then 5:1, vol.). Yield 26.19 g (98.8%) of the title product as a yellowish glass.1H NMR (CDCl3): δ 7.35 (s, 1H), 7.17 (2s, sum 3H), 7.13 (s, 2H), 7.04 (s, 1H), 6.86 (s, 1H), 3.57 (d, J = 1.4 Hz, 2H), 3.27 (s, 3H), 2.40 (s, 6H), 2.31 (s, 6H), 1.46 (s, 9H).13C NMR (CDCl3): δ 155.20, 145.93, 141.71, 141.38, 140.26, 138.09, 137.96, 137.86, 136.03, 132.08, 128.89, 128.66, 127.25, 126.21, 123.29, 118.20, 60.68, 39.02, 35.19, 30.96, 21.47, 21.32. Synthesis of [6-tert-butyl-4-(3,5-dimethylphenyl)-5-methoxy-2-methyl-1H-inden-1-yl] chlorodimethylsilane nBuLi in hexanes (2.43 M, 14.6 ml, 35.5 mmol) was added in one portion to a solution of 5-tert-butyl-7-(3,5-dimethylphenyl)-6-methoxy-2-methyl-1H-indene (11.3 g, 35.3 mmol) in 200 ml of ether cooled to –50 °C. The resulting orange solution was stirred overnight at room temperature, then the obtained orange solution containing a yellowish precipitate was cooled to –78 °C (the precipitate almost completely disappeared), and dichlorodimethylsilane (22.8 g, 177 mmol, 5 equiv) was added in one portion. The formed solution was warmed to room temperature and stirred overnight at room temperature. The resulting mixture was filtered through glass frit (G4). The precipitate was additionally washed by 2×10 ml of ether. The combined filtrate was evaporated to dryness to give the title material as slightly orange oil which was used without further purification. [6-tert-Butyl-2,4-bis(3,5-dimethylphenyl)-5-methoxy-1H-inden-1-yl][6-tert-butyl-4-(3,5- dimethylphenyl)-5-methoxy-2-methyl-1H-inden-1-yl]dimethylsilane nBuLi in hexane (2.5 M, 8.0 ml, 20.0 mmol) was added in one portion to a solution of 5- tert-butyl-2,7-bis(3,5-dimethylphenyl)-6-methoxy-1H-indene (8.15 g, 19.85 mmol) in 100 ml of ether cooled to –50 °C. The resulting mixture was stirred overnight at room temperature, then the so obtained yellow suspension was cooled to –50 °C and 150 mg of CuCN was added. The obtained mixture was stirred for 0.5 h at –25 °C, then a solution of 8.3 g (20.09 mmol) of [6-tert-butyl-4-(3,5-dimethylphenyl)-5-methoxy-2-methyl-1H-inden- 1-yl]chlorodimethylsilane in a mixture of 125 ml of ether and 25 ml of THF was added in one portion. This mixture was stirred 2 h at room temperature, then filtered through a pad of silica gel 60 (40-63 µm) which was additionally washed with 2 ^50 ml of hexane. The combined organic elute was evaporated to dryness, and the residue was dried under vacuum at elevated temperature to give 15.81 g (20.08 mmol, ca.100%, purity ca.90%) of the title product (a ca. 80:20 mixture of the stereoisomers) as a slightly orange solid glass which was used without further purification. Anti-dimethylsilanediyl[2,4-bis(3,5-dimethylphenyl)-5-methoxy-6-tert-butylinden-1-yl][2- methyl-4-(3,5-dimethylphenyl)-5-methoxy-6-tert-butylinden-1-yl]zirconium dichloride (MC- IE1) nBuLi in hexanes (2.5 M, 15.0 ml, 37.5 mmol) was added in one portion at room temperature to a solution of [6-tert-butyl-2,4-bis(3,5-dimethylphenyl)-5-methoxy-1H-inden- 1-yl][6-tert-butyl-4-(3,5-dimethylphenyl)-5-methoxy-2-methyl-1H-inden-1-yl]dimethylsilane (14.78 g, ca.18.78 mmol) in 100 ml of di-n-butyl ether. This mixture was stirred for 4.5 h at room temperature, then the resulting red solution was cooled to 0 °C in an ice-bath, then ZrCl4 (4.38 g, 18.8 mmol) was added. The reaction mixture was stirred for 24 h at room temperature to give a red suspension. This suspension was evaporated to dryness. On the evidence of NMR spectroscopy, the resulting solid included a ca.40 / 60 mixture of anti- and syn-zirconocene dichlorides. This solid was extracted with 100 ml of boiling toluene. The obtained extract was evaporated to ca.5 ml, and 50 ml of hexane was added. The orange precipitate formed in this warm solution was collected and dried under vacuum. This procedure gave 2.7 g of anti-zirconocene contaminated with ca.3% of syn-isomer. The mother liquor was evaporated to dryness, and the residue was dissolved in 50 ml of hexane. The orange precipitate formed in this solution overnight at room temperature was collected and dried under vacuum. This procedure gave 1.5 g of anti-zirconocene, contaminated with ca.5% of syn-isomer. Thus, the total yield of anti-complex isolated in this synthesis was 4.2 g (23%). 1.5 g of anti-isomer, contaminated with ca. 5% of syn- isomer was dissolved in 100 ml of a hot mixture n-hexane:toluene = 10:1. The resulting solution was evaporated to ca.5 ml, and then 15 ml of n-hexane was added. The orange solid precipitated from this mixture was filtered off (G4) and dried under vacuum. This procedure gave 0.9 g of pure anti-dimethylsilanediyl[2,4-bis(3,5-dimethylphenyl)-5- methoxy-6-tert-butylinden-1-yl][2-methyl-4-(3,5-dimethylphenyl)-5-methoxy-6-tert- butylinden-1-yl]zirconium dichloride (MC-IE1). Anal. calc. for C55H64Cl2O2SiZr.: C, 69.73; H, 6.81. Found: C, 69.90; H, 7.01. MC-IE1:1H NMR (CDCl3): δ 7.66 (s, 1H), 7.60-6.90 (very br.s, 4H), 7.05 (s, 2H), 6.97 (s,1H), 6.95 (s,1H), 6.85 (s,1H), 6.68 (s,1H), 6.62 (s,1H), 6.59 (s,1H), 3.46 (s, 3H), 3.43 (s, 3H), 2.36 (s, 12H), 2.26 (s, 6H), 2.21 (s, 3H), 1.41 (s, 9H), 1.35 (s, 3H), 1.07 (s, 3H), 1.03 (s, 9H).13C NMR (CDCl3): δ 159.80, 159.50, 144.18, 143.69, 141.63, 137.82 (br.s), 136.89, 136.76, 135.80, 135.20, 134.64, 134.22, 129.55, 128.86, 128.80, 127.62, 127.40 (br.s), 126.80, 124.82, 121.88, 121.53, 121.43, 120.47, 118.88, 82.01, 80.15, 62.67, 62.51, 35.85, 35.17, 30.36, 29.86, 21.49, 18.56, 5.28, 2.83. Synthesis of MC-IE2 Bis[6-tert-butyl-2,4-bis(3,5-dimethylphenyl)-5-methoxy-1H-inden-1-yl]dimethylsilane nBuLi in hexanes (2.5 M, 10.15 ml, 25.4 mmol) was added in one portion to a solution of 5-tert-butyl-2,7-bis(3,5-dimethylphenyl)-6-methoxy-1H-indene (10.43 g, 25.4 mmol) in a mixture of 150 ml of ether and 50 ml of THF at -50 °C. This mixture was stirred overnight at room temperature, then the resulting orange-yellow solution was cooled to -50 °C, and 100 mg of CuCN was added. The obtained mixture was stirred for 15 min at -25 °C, and then 1.64 g (12.7 mmol) of dichlorodimethylsilane was added in one portion. This mixture was stirred for 5 h at room temperature, then filtered through a pad of silica gel 60 (40-63 µm) which was additionally washed with 20 ml of ether. The combined organic elute was evaporated to dryness. The crude product was purified by flash chromatography on silica gel 60 (40-63 µm, 600 ml, eluent: hexanes: dichloromethane = 5:1, vol.). This procedure gave 8.4 g (75%) of a ca.2:3 mixture of the diastereomers. Anti-dimethylsilanediylbis[2,4-bis(3,5-dimethylphenyl)-5-methoxy-6-tert-butylinden-1-yl] zirconium dichloride nBuLi in hexanes (2.5 M, 7.2 ml, 18.0 mmol) was added in one portion to a solution of bis[6-tert-butyl-2,4-bis(3,5-dimethylphenyl)-5-methoxy-1H-inden-1-yl]dimethylsilane (7.9 g, 9.0 mmol) in 110 ml of di-n-butyl ether at room temperature. This mixture was stirred for 15 h at room temperature, then the resulting yellow solution was cooled to 0 °C in an ice- bath, and ZrCl4 (2.1 g, 9.0 mmol) was added. The reaction mixture was stirred for 24 h at room temperature to give a red suspension. This suspension was evaporated to dryness. The formed solid was extracted with 50 ml of hot toluene. On the evidence of NMR spectroscopy, the obtained extract included a ca.7:3 mixture of anti- and syn-MC-IE2. This extract was evaporated to the state of oil, the residue was dissolved in 30 ml of n-hexane. The orange solid precipitated from this solution was collected and dried under vacuum. This procedure gave 4.20 g (45%) of rac-MC-IE2. Rac-MC-IE2: Anal. calc. for C62H70Cl2O2SiZr: C, 71.78; H, 6.80. Found: C, 72.04; H, 7.04.1H NMR (CDCl3): δ 7.48 (very br. s, 2H), 7.10 (br. s, 6H), 6.96 (s, 2H), 6.87 (s, 2H), 6.85 (s, 2H), 6.65 (s, 2H), 3.44 (s, 6H), 2.35 (br. s, 12H), 2.28 (s, 12H), 1.18 (s, 6H), 1.05 (s, 18H).13C NMR (CDCl3): δ 159.50, 143.92, 142.17, 137.85 (br. s), 137.20 (br. s), 136.85, 135.40, 134.80, 129.58, 128.82, 127.43, 123.59, 120.99, 119.56, 79.86, 62.55, 35.28, 29.84, 21.49, 5.81. Synthesis of MC-IE3 2-[5-tert-Butyl-7-(3,5-dimethylphenyl)-6-methoxy-1H-inden-2-yl]-5-methylthiophene A mixture of 45.64 g (118.44 mmol) of 2-bromo-5-tert-butyl-7-(3,5-dimethylphenyl)-6- methoxy-1H-indene, 33.5 g (149.47 mmol, 1.26 equiv.) of 5-(4,4,5,5-tetramethyl-1,3,2- dioxaborolan-2-yl)-2-methylthiophene, 650 mg (1.27 mmol, 1.07 mol.%) of Pd(PtBu3)2, 38.2 g of Na2CO3, 200 ml of 2-methyltetrahydrofurane, and 175 ml of water was refluxed for 6.5 h. Then, 500 ml of water was added, the organic layer was separated, and the aqueous layer was extracted with 300 ml of dichloromethane. The combined organic extract was dried over K2CO3 and then evaporated to dryness to give a black oil. The product was isolated by flash-chromatography on silica gel 60 (40-63 µm, eluent: hexanes- dichloromethane = 10:1, vol.). Yield 17.48 g (36.7%) of 2-[5-tert-butyl-7-(3,5- dimethylphenyl)-6-methoxy-1H-inden-2-yl]-5-methylthiophene as a reddish glass.1H NMR (CDCl3): δ 7.28 (s, 1H), 7.11 (s, 2H), 7.02 (s, 1H), 6.87 (s, 1H), 6.82 (d, J = 3.5 Hz, 1H), 6.60 (dd, J = 3.5 Hz, J = 1.3 Hz, 1H), 3.54 (d, J = 1.3 Hz, 2H), 3.26 (s, 3H), 2.45 (s, 3H), 2.38 (s, 6H), 1.44 (s, 9H).13C NMR (CDCl3): δ 155.14, 141.45, 140.80, 140.09, 140.04, 138.84, 138.72, 137.97, 137.83, 132.01, 128.66, 127.17, 125.72, 125.08, 123.49, 117.99, 60.65, 39.66, 35.17, 30.93, 21.44, 15.46. [6-tert-Butyl-4-(3,5-dimethylphenyl)-5-methoxy-2-methyl-1H-inden-1-yl][6-tert-butyl-4- (3,5-dimethylphenyl)-5-methoxy-2-(5-methyl-2-thienyl)-1H-inden-1-yl]dimethylsilane nBuLi in hexanes (2.5 M, 5.6 ml, 14.0 mmol) was added in one portion to a suspension of 2-[5-tert-butyl-7-(3,5-dimethylphenyl)-6-methoxy-1H-inden-2-yl]-5-methylthiophene (5.65 g, 14.03 mmol) in 100 ml of ether cooled to –50 °C. The resulting mixture was stirred overnight at room temperature, then the so obtained red solution was cooled to –50 °C, and 100 mg of CuCN was added. The obtained mixture was stirred for 15 min at –25 °C, then a solution of 5.8 g (14.04 mmol) of [6-tert-butyl-4-(3,5-dimethylphenyl)-5-methoxy-2- methyl-1H-inden-1-yl]chlorodimethyl silane in 100 ml of ether was added in one portion. This mixture was stirred for 4 h at room temperature, then filtered through a pad of silica gel 60 (40-63 µm) which was additionally washed with 2 ^50 ml of ether. The combined organic elute was evaporated to dryness, and the residue was dried under vacuum at elevated temperature to give 11.03 g (ca.100%, purity ca.90%) of the title product (a ca. 80:20 mixture of the stereoisomers) as a red solid glass that was used without further purification. Anti-dimethylsilanediyl[2-methyl-4-(3,5-dimethylphenyl)-5-methoxy-6-tert-butylinden-1- yl][2-(5-methyl-2-thienyl)4-(3,5-dimethylphenyl)-5-methoxy-6-tert-butyl-inden-1- yl]zirconium dichloride (MC-IE3) nBuLi in hexanes (2.5 M, 10.4 ml, 26.0 mmol) was added in one portion at room temperature to a solution of [6-tert-butyl-4-(3,5-dimethylphenyl)-5-methoxy-2-methyl-1H- inden-1-yl][6-tert-butyl-4-(3,5-dimethylphenyl)-5-methoxy-2-(5-methyl-2-thienyl)-1H- inden-1-yl]dimethylsilane (10.12 g, ca. 12.99 mmol) in 75 ml of di-n-butyl ether. This mixture was stirred for 4.5 h at room temperature, then the resulting red solution was cooled to 0 °C in an ice-bath, and ZrCl4 (3.03 g, 13.0 mmol) was added. The reaction mixture was stirred for 24 h at room temperature to give an orange suspension. This suspension was evaporated to dryness. On the evidence of NMR spectroscopy, the resulting solid included a ca.70 / 30 mixture of anti- and syn-zirconocene dichlorides. This solid was extracted with 200 ml of boiling toluene, the obtained extract was evaporated to ca.80 ml. The orange solid precipitated from this solution overnight at room temperature was collected and dried under vacuum. This procedure gave 1.25 g of anti-zirconocene dichloride. The mother liquor was evaporated to 30 ml, and 20 ml of hexane was added. The orange solid precipitated from this solution over 0.5 h was collected and dried under vacuum. This procedure gave 3.5 g of anti-zirconocene dichloride. The mother liquor was evaporated to 5 ml, and 35 ml of hexane was added. The orange solid precipitated from this solution overnight was collected and dried under vacuum. This procedure gave 1.8 g of anti-zirconocene dichloride. Anal. calc. for C52H60Cl2O2SSiZr.: C, 66.49; H, 6.44. Found: C, 66.67; H, 6.59.1H NMR (CDCl3): δ 7.61 (s, 1H), 7.57-6.96 (very br. s, 4H), 6.97 (s, 1H), 6.94 (s, 1H), 6.88 (s, 1H), 6.76 (d, J = 3.5 Hz, 1H), 6.60 (s, 1H), 6.57 (dd, J = 3.5 Hz, J = 1.1 Hz, 1H), 6.56 (s, 1H), 3.47 (s, 3H), 3.46 (s, 3H), 2.41 (d, J = 0.5 Hz, 3H), 2.38 (s, 6H), 2.34 (s, 6H), 2.18 (s, 3H), 1.40 (s, 9H), 1.31 (s, 3H), 1.19 (s, 9H), 1.10 (s, 3H).13C NMR (CDCl3): δ 159.99, 159.72, 144.53, 143.58, 142.01, 137.85 (br.s), 136.82, 136.61, 135.78, 135.16, 134.57, 133.83, 133.36, 129.91, 128.90, 128.81, 127.44, 127.37, 127.34 (br.s), 126.80, 124.89, 123.60, 122.04, 121.88, 121.28, 121.12, 119.65, 82.13, 81.91, 62.79, 62.56, 35.86, 35.48, 30.35, 29.71, 21.51, 21.46, 18.53, 15.24, 5.11, 2.70. Synthesis of MC-IE4 Bis[6-tert-butyl-4-(3,5-dimethylphenyl)-5-methoxy-2-(5-methyl-2-thienyl)-1H-inden-1- yl]dimethylsilane nBuLi in hexanes (2.5 M, 9.8 ml, 24.5 mmol) was added in one portion to a solution of 2- [5-tert-butyl-7-(3,5-dimethylphenyl)-6-methoxy-1H-inden-2-yl]-5-methylthiophene (9.9 g, 24.59 mmol) in 150 ml of ether at –50 °C. This mixture was stirred overnight at room temperature, then the resulting red solution was cooled to –50 °C, then 100 mg of CuCN was added. The obtained mixture was stirred for 15 min at –25 °C, and then 1.59 g (12.32 mmol) of dichlorodimethylsilane was added in one portion. This mixture was stirred for 4 h at room temperature, then filtered through a pad of silica gel 60 (40-63 µm) which was additionally washed with 4 ^15 ml of dichloromethane. The combined filtrate was evaporated under a reduced pressure, 15 ml of hexane was added, and the formed suspension was filtered through glass frit (G4).The resulting white powder was dried under vacuum to give 5.61 g (53%) of pure rac-isomer. Rac-isomer.1H NMR (CDCl3): δ 7.73 (s, 2H), 7.13 (s, 4H), 7.01 (s, 2H), 6.76 (s, 2H), 6.62 (d, J = 3.5 Hz, 2H), 6.53 (dd, J = 3.5 Hz, J = 1.1 Hz, 2H), 4.51 (s, 2H), 3.29 (s, 6H), 2.39 (s, 18H), 1.52 (s, 18H), -0.86 (s, 6H).13C NMR (CDCl3): δ 155.67, 143.12, 143.04, 141.17, 139.39, 139.16, 138.62, 137.83, 137.69, 128.57, 128.46, 127.89, 125.52, 124.69, 124.07, 119.75, 60.65, 45.08, 35.37, 31.24, 21.45, 15.41, -6.55. Anti-dimethylsilanediylbis[2-(5-methyl-2-thienyl)-4-(3,5-dimethylphenyl)-5-methoxy-6-tert- butyl inden-1-yl]]zirconium dichloride (MC-IE4) nBuLi in hexanes (2.5 M, 8.5 ml, 21.25 mmol) was added in one portion to a solution of bis[6-tert-butyl-4-(3,5-dimethylphenyl)-5-methoxy-2-(5-methyl-2-thienyl)-1H-inden-1-yl] dimethylsilane (9.1 g, 10.57 mmol) in 75 ml of di-n-butyl ether at room temperature. This mixture was stirred for 4.5 h at room temperature, then the resulting red solution was cooled to 0 °C in an ice-bath, and ZrCl4 (2.46 g, 10.56 mmol) was added. The reaction mixture was stirred for 24 h at room temperature to give a red suspension. This suspension was evaporated to dryness. On the evidence of NMR spectroscopy, the resulting solid included a ca. 45 / 55 mixture of rac- and meso-zirconocene dichlorides. This solid was extracted with 150 ml of boiling toluene. The obtained extract was evaporated to ca.35 ml, and 35 ml of hexane was added. The red crystalline precipitate formed in this solution overnight at room temperature was collected and then dried under vacuum. This procedure gave 3.9 g of meso-zirconocene dichloride contaminated with 2% of rac-isomer and containing 0.75 mol of n-hexane per mol of meso-complex, so the adjusted net weight of the isolated complexes was 3.67 g. The mother liquor was evaporated to ca.15 ml, and 35 ml of hexane was added. The orange precipitate formed in this solution over 0.5 h at room temperature was collected and dried under vacuum. This procedure gave 2.1 g of rac-zirconocene dichloride. MC-IE4: Anal. calc. for C56H62Cl2O2S2SiZr.: C, 65.85; H, 6.12. Found: C, 66.04; H, 6.30.1H NMR (CDCl3): δ 7.65-7.25 (very br.s, 2H), 7.25-6.95 (very br.s, 2H), 6.99 (s, 2H), 6.95 (s, 2H), 6.77 (d, J = 3.5 Hz, 2H), 6.60 (s, 2H), 6.58 (dd, J = 3.5 Hz, J = 1.1 Hz, 2H), 3.48 (s, 6H), 2.41 (d, J = 0.7 Hz, 6H), 2.35 (br.s, 12H), 1.21 (s, 18H), 1.14 (s, 6H).13C NMR (CDCl3): δ 159.90, 144.13, 142.08, 137.85 (br.s), 136.62, 135.24, 134.49, 134.13, 130.01, 128.86, 127.40 (br.s), 127.19, 124.81, 122.76, 121.56, 120.41, 81.94, 62.70, 35.60, 29.70, 21.47, 15.24, 5.45. Catalyst synthesis, used chemicals All catalysts have been prepared using silica Sunspera AGC DM-L-303, calcined at 600 °C. MAO Axion CA1330 was used as received and stored at –20 °C for not longer than 6 months. Catalyst preparations The catalysts were prepared by following a two-step preparation method. First step is the preparation of SiO2 / MAO (activated carrier), followed by a second step where a toluene solution of the metallocene complex is impregnated on the dry support from the first step. Preparation of SiO2 / MAO activated carrier A steel reactor equipped with a mechanical stirrer and a filter net was flushed with nitrogen. 10 kg of SiO2 carrier was first added from a feeding drum into the reactor, followed by careful pressurizing and depressurizing with nitrogen. Then, toluene (43.5 kg) was added. The SiO2 / toluene slurry was stirred for 25 min at 22 °C. Then, 18 kg of 30 wt% MAO in toluene (Axion CA 1330) was added slowly (140 min) through a 12 mm line on the top of the reactor keeping the temperature around 22 °C. After MAO addition, the reactor temperature was quickly increased to 90 °C and the mixture was stirred at this temperature for 120 min. Then the hot toluene was filtered out and the solid cake was washed twice with hot toluene while stirring (43.5 kg, 90 °C, 30 min, 40 rpm). Each time the hot toluene was filtered out. Finally the solid cake was dried with slow stirring (5 rpm) under vacuum for 9 h at 80 °C. Synthesis of SiO2 / MAO / MC-CE1 catalyst = Comparison catalyst 1 In a nitrogen filled glovebox, dry toluene (2.5 mL) was added to 27 mg of metallocene rac- dimethylsilanediylbis(2-methyl-4-(3’,5’-di-methylphenyl)-5-methoxy-6-tert-butylinden-1-yl) zirconium dichloride. The solution was stirred for 30 minutes at room temperature. Next, 2.0 g of SiO2 / MAO was placed in a septum bottle. The solution of metallocene in toluene was added dropwise by means of a syringe to the SiO2 / MAO carrier over the course of 5 minutes with gentle mixing. The resulting powder was allowed to rest for 1 hour, then it was transferred into a Schlenk flask and dried under vacuum for 1 hour at 60 °C to yield the catalyst as a red free-flowing powder. Synthesis of SiO2 / MAO / MC-IE1 catalyst = inventive catalyst 1 (IE1) In a nitrogen filled glovebox, dry toluene (2.5 mL) added to 28.2 mg of metallocene rac- anti-dimethylsilanediyl[2,4-bis(3,5-dimethylphenyl)-5-methoxy-6-tert-butylinden-1-yl][2- methyl-4-(3,5-dimethylphenyl)-5-methoxy-6-tert-butylinden-1-yl]zirconium dichloride. The mixture was stirred for 30 minutes at room temperature. Next, 2.0 g of SiO2 / MAO was placed in a septum bottle. The solution of metallocene in toluene was added dropwise by means of a syringe to the SiO2 / MAO carrier over the course of 5 minutes with gentle mixing. The resulting powder was allowed to rest for 1 hour and then it was transferred into a Schlenk flask and dried under vacuum for 1 hour at 60 °C to yield the catalyst as a peach colour free-flowing powder. Synthesis of SiO2 / MAO / MC-IE2 catalyst = inventive catalyst 2 (IE2) In a nitrogen filled glovebox, dry toluene (2.5 mL) added to 31.2 mg of metallocene rac- anti-dimethylsilanediylbis[2,4-bis(3,5-dimethylphenyl)-5-methoxy-6-tert-butylinden-1-yl] zirconium dichloride. The mixture was stirred for 30 minutes at room temperature. Next, 2.0 g of SiO2 / MAO was placed in a septum bottle. The solution of metallocene in toluene was added dropwise by means of a syringe to the SiO2 / MAO carrier over the course of 5 minutes with gentle mixing. The resulting powder was allowed to rest for 1 hour and then it was transferred into a Schlenk flask and dried under vacuum for 1 hour at 60 °C to yield the catalyst as a peach colour free-flowing powder. Synthesis of SiO2 / MAO / MC-IE3 catalyst = inventive catalyst 3 (IE3) In a nitrogen filled glovebox, dry toluene (2.5 mL) added to 27.9 mg of metallocene rac- anti-dimethylsilanediyl[2-(5-methylthiophen-2-yl)-4-(3,5-dimethylphenyl)-5-methoxy-6- tert-butylinden-1-yl][2-methyl-4-(3,5-dimethylphenyl)-5-methoxy-6-tert-butylinden-1- yl]zirconium dichloride. The mixture was stirred for 30 minutes at room temperature. Next, 2.0 g of SiO2 / MAO was placed in a septum bottle. The solution of metallocene in toluene was added dropwise by means of a syringe to the SiO2 / MAO carrier over the course of 5 minutes with gentle mixing. The resulting powder was allowed to rest for 1 hour and then it was transferred into a Schlenk flask and dried under vacuum for 1 hour at 60 °C to yield the catalyst as a beige free-flowing powder. Synthesis of SiO2 / MAO / MC-IE4 catalyst = Inventive catalyst 4 (IE4) In a nitrogen filled glovebox, dry toluene (2.5 mL) added to 31.1 mg of metallocene rac- dimethysilanediylbis[2-(5-methylthiophen-2-yl)-4-(3,5-dimethylphenyl)-5-methoxy-6-tert- butylinden-1-yl]zirconium dichloride. The mixture was stirred for 30 minutes at room temperature. Next, 2.0 g of SiO2 / MAO was placed in a septum bottle. The solution of metallocene in toluene was added dropwise by means of a syringe to the SiO2 / MAO carrier over the course of 5 minutes with gentle mixing. The resulting powder was allowed to rest for 1 hour, and then it was transferred into a Schlenk flask and dried under vacuum for 1 hour at 60 °C to yield the catalyst as a beige free-flowing powder. The metallocene content in each catalyst is calculated by mass balance. The values are listed in Table 1: Table 1: catalysts tested and their metallocene content Catalyst MC Al MC in catalyst * type wt% wt% Comparative CE1 MC-CE1 13,2 1,33 1 IE1 Inventive 1 MC-IE1 12,8 1,39 IE2 Inventive 2 MC-IE2 12,3 1,54 IE3 Inventive 3 MC-IE3 12,7 1,38 IE4 Inventive 4 MC-IE4 12,7 1,53 * metallocene content in the dry catalyst calculated from mass balance Polymerization examples Propylene homopolymerization procedure in bulk (liquid propylene, 20-L reactor) A stainless-steel reactor equipped with a ribbon stirrer, with a total volume of 20.9 dm³ containing 0.2 bar-g propylene, was filled with additional 3.95 kg propylene. Triethylaluminium (0.8 ml of 0.62 molar solution in n-heptane) was added using a stream of 250 g propylene, then 0.5 NL of H2 was added via mass flow controller in one minute. The reactor temperature was stabilized at 25 °C (HB-Therm) and the solution is stirred and 250 rpm for at least 20 min. Then the catalyst was injected as described in the following. The desired amount of solid catalyst was loaded into a 5 ml stainless steel vial. This feeder system was mounted on a port on the lid of the autoclave. Then the catalyst was flushed into the reactor with 350 g propylene. Stirring speed was kept at 250 rpm and pre- polymerization was run for 10 minutes at the temperature indicated in table 2. Then the polymerization temperature was increased to 75 °C (in one example at 85°C, see table 2). The second aliquot of H2 was added at 60 °C during 1 min. The reactor temperature was kept constant throughout the polymerization. The polymerization time was measured starting when the temperature is 2 °C below the set polymerization temperature. After 60 min, the reaction was stopped by injecting 5 ml ethanol, cooling the reactor and simultaneously flashing the volatile components. After purging the reactor 3 times with N2 and one vacuum / N2 cycle, the reactor was opened, the polymer powder was taken out and dried overnight in a fume hood.100 g of the polymer were additivated with 0.5 wt% Irganox B225 (dissolved in acetone) and then dried overnight in a fume hood and additionally one hour in a vacuum drying oven at 60 °C. Propylene / ethylene copolymerization procedure in bulk (liquid propylene, 20 L reactor) A stainless-steel reactor equipped with a ribbon stirrer, with a total volume of 20.9 dm³ containing 0.4 bar-g propylene, was filled with 3.95 kg propylene. Triethylaluminum (0.80 ml of a 0.62 mol / l solution in heptane) was injected into the reactor by additional 240 g propylene, then 0.5 NL of H2 is dosed in via mass flow controller. The solution was stirred at 25 °C and 250 rpm for at least 20 min. The catalyst was injected as described in the following. The desired amount of solid catalyst was loaded into a 5 ml stainless steel vial. The feeder system is mounted on a port on the lid of the autoclave. Then the catalyst is flushed into the reactor with 350 g propylene. The prepolymerization was run for 10 min. at the temperature indicated in table 3. At the end of the prepolymerization step, the temperature was raised to 70 or 75 °C (see table 3) and kept constant throughout the polymerisation. As the reactor temperature reached 60 °C, 108 g of ethylene were added in two minutes via mass flow controller and, at the same time, an additional amount of H2 was dosed in 1 min via mass flow controller. The polymerization time was measured starting when the internal reactor temperature was 2°C below the set temperature of the bulk step. When the polymerization time of 60 min has lapsed, the reaction was stopped by injecting 5 ml ethanol from a steel cylinder filled with 5 ml ethanol and pressurized with 70 bar N2, cooling the reactor down to 30 °C and simultaneously flashing the volatile components. After purging the reactor 3 times with N2 and one vacuum / N2 cycle, the reactor was opened, the polymer powder was taken out and dried overnight in a fume hood.100 g of the polymer was additivated with 0.5 wt% Irganox B225 (dissolved in acetone) and then dried overnight in a fume hood and additionally one hour in a vacuum drying oven at 60 °C. 2-step heterophasic copolymerization procedure (hPP in bulk + EPR in gas phase, 20-L reactor) Step 1 corresponds to the bulk experiment run at 75 °C with the H2 split between prepoly (0.5 NL) and transition to the bulk step (0.5 NL). Step 2 was performed as follows. After the bulk homopolymerization step was completed, the stirrer speed was reduced to 50 rpm and the pressure was reduced to 0.4 bar-g by venting the monomers. The stirrer speed was set to 180 rpm and the reactor temperature was set to 70 °C. Then the reactor pressure was increased to 20 bar-g by feeding a C3 / C2 gas mixture of 0,937 g / g. The C3 / C2 ratio is defined by where C2 / C3 is the weight ratio of the two monomers and R is their relative reactivity ratio, determined experimentally. In the present experiments, the value of R was set at 0.35. The temperature was held constant by thermostat and the pressure was kept constant by feeding via mass flow controller a C2 / C3 gas mixture of 0.333 g / g, a composition corresponding to the target polymer composition and by thermostat, until the set time of 120 min had expired. Then the reactor was cooled down (to about 30 °C) and the volatile components flashed out. After purging the reactor 3 times with N2 and one vacuum / N2 cycle, the product was taken out and dried overnight in a fume hood.100 g of the polymer was additivated with 0.5 wt% Irganox B225 (solution in acetone) and dried overnight in a hood followed by 2 hours in a vacuum drying oven at 60°C. Propylene polymerization results We have compared the performance in liquid propylene polymerization of the five different catalysts IE1, IE2, IE3, IE4 and CE1 based on the five different metallocenes. The results for hPP are listed in Table 2. The four inventive catalysts have been also tested in propylene / ethylene random copolymerization in liquid propylene, the results are listed in Table 3.

[0002] 14 13 12 11 1 T 0 9 8 7 6 5 4 3 2 1 a Example b leIEIEIEIEIEIEIEI I I IC C C C24 4 3 3 2 2 2E2E2E1E1 E E E 1 1 1 Catalyst a ta9 7 90 60 66 8 1ly0 7 6 m s4 2 3 9 5 5 5 5 7 1 9 0 4 0 1 3 g t catalyst amount 25 25 25 25 30 30 30 30 30 25 25 30 30 30 °C temperature P rep 1 1 1 1 1 1 1 1 1 1 1 1 1 1 m nio0 0 0 0 0 0 0 0 0 0 0 0 0 0 timely0,50 ,50 , 0 , 1 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 0,0s0,Nte1 15151015050505051515 5 50 L H2 fed before p prepoly 0,52 1,50 2,52 1,50 2,00 0,50 1,51 1,02 1,00 2,52 1,52 2,01 0,51 0,0N T 0 L H2 fed in transitionrans 60 60 60 60 n / 6 6 6 6 6 6 6 6 6 °itia0 0 0 0 0 0 0 0 0 C Temp. of H2on feeding in transition 75 75 75 75 75 75 85 75 75 75 75 75 75 75 °C Temperature s B u 60 60 60 60 60 60 60 60 60 60 60 6 mtep 0 60 60nliktime 20 6 4 5 5 5 9 7 6 4 5 7 7 80 06 45 24 10 97 47 75 38 90 25 85 70 08 g Yield 2 1 g,18 ,44 ,98 ,77 ,77 ,56 ,90 ,99 ,25 ,49 1 ,75 1 ,75 1 ,15 c k ,2a g t / Productivity 64 1 5 1 1 1 g k 3 5 35 63 50 48 44 70 60 39 69 1 1 1 M g Metallocene9 0 9 5 2 5 9 9 0 2 9 80 35 46 C / productivity 0,40 ,40 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , g Powder bulk9 8484747484846454442484849 / ml density R 1 1 e 2 2 3 3 4 5 13 13 0m M s 0 0 2 9 8 1 6 2 FR2 powder u,985,366,3,1,19 ,199,863,8,60 ,5 nig / lts16 16 15 1 1 1 1 1 1 1 1 1 1 14 2 8 57 6 6 6 6 6 6 5 5 5 5 °C T,2,0,7,83 ,33 ,42 ,32 ,40 ,50 ,59 ,00 ,21 ,10 ,6m 14 3 20 3 6 6 5 4 2 12 1 g 40 5 0 4 5 2 7 2 1 8 21 50 92 5 M0 50 00 7 0 0 8 0 0 7 0 0 7 0 0 6 0 5 5 0 7 7 1 55 / mo n0 0 0 00 00 50 00 00 00 l 37 8 56 9 14 14 13 9 5 32 5 23 31 49 g 5 7 1 2 9 2 2 7 M0 5 2 6 5 1 8 / m0 95 50 7 5 0 0 4 1 5 9 0 0 5 o w0 0 0 00 00 00 00 50 50 00 00 00 00 00 l 2,62 ,52 ,82 ,72 ,32 ,32 ,32 ,32 ,62 ,52 ,64 ,63 ,43 ,2Mw / MnIEIEIEIEIEIEIEIEC T4 4 3 3 2 2 1 1 Catalyst a t a a b 72 94 66 9 m 0 74 80 62 90lyleg catalyst amount st32 P 5 25 25 25 30 30 25 25 °C temperature re 1 m p 0 10 10 10 10 10 10 10ino timely0,0 0 0 0 0s51,51,51,51,50,0 5 0,0 5 1,5N Ht1 L 2ep 0,051,0 5 1,0 5 1,0 5 1,0 0 0 5 N H 1,51,51,51 L 2 T 1 r 0 0 10 0 1 1 a8 8 09 0 08 0 g C2 ns 5 n 1 m ai4 / 5 n / n 4a0 5 n 9 / a4 / aing / tiC2 dosing rateon 6 n 6 n 3 n 6 n 0 / a0 / a0 / a0 / a°C temperature of C2 7 ad B 5 75 75 75 70 75 75 75 °C dition u Temperaturelk6 6 6 6 6 6 6 6 ms0 0 0 0 0 0 0 0intimetep 22 20 64 4 1 4 1 59 87 4 0 0 1 5 3 7 9 g 0 3 0 Yield 3,21,9 4 1 1,7,95 7 1 , 4 5 3,5,1,4c g k a g t / Productivity 2 1 1 0 3 70 35 99 48 0 39 M g k 0 9 6 9 2 5 1 g Metallocene 3 2 C / 0 0 0 0 productivity R,4,0 0 0 0 4,4,4,4,4,4,4g / me9 9 9 8 9 8 8 4 l Powder bulk density su 1l1 0 0 0 5 3 1 0ts,1,9,3,31 , 9 1 0,1,5,8m g in / MFR2 powder 0 w ,2t%X S 61 1 1 1 54 6 4 5 1 1 1 1 7 4 2 8 44 63 44 60 °C m T,3,2,5,7,3,4,0,536 37 51 56 12 14 33 3 g 3 5 9 2 6 2 2 M0 0 0 0 6 2 / m0 0 0 0 0 0 o w0 0 00 00 00 00 00 00 l M 2,2 2 2 2 2 2 23,6,5,8,2,3,4,5w / Mn 1.1 2 w60.60.10 1 .70t%C 2 FT 0 n RIR.7 / 0 a.n 7 / 1 a.n 0 / 0 a.n 7 / aC2 / C3 1,1 1 15n w / ,6n,9n,6n t%C6a4 / a7 / a8 / a2 0 0 0 R,6n 7 / a,7n 1 / a,9n 0 8 / a,7n C 3 / a2 / C3 0 m m,0n 0 , n 0 , n 0 , n o N M 0 / a 00 / a 00 / a 00 / al%rrmR 0,0n 0 n 0 n 0 n m E o 0 / a,07 / a,00 / a,04 / al%-2,10,0 0 0 m 20n 0 / a,2n 7 / a,0n 0 / a,2n o 3 / al%,1e 0 m,0n 0 ,0n 0 ,0n 0 , n o 30 / a0 / a0 / a 00 / al%,1 In terms of polymerization performance, all four inventive catalysts were significantly more isoselective in propylene polymerization upon MAO activation compared to CE1, producing, under standard liquid monomer polymerization conditions, hPP having higher Tm. The hPP melting points obtained with the five catalysts CE1, IE1, IE2, IE3, IE4 as a function of the MFR of the homopolymer are compared in Figure 1. The results of propylene / ethylene copolymerization in liquid propylene show that ethylene has a strong activating effect, and this effect is stronger for the 2-aryl substituted complexes (catalysts IE1 and IE2), as shown in Figure 2. Heterophasic copolymers with very high rubber molecular weight can also be obtained with the catalysts of the present invention, as shown for example by ethylene / propylene copolymerization experiments in gas phase with MC-IE1 and MC-IE3 (Table 4). Table 4: catalyst performance in gas phase EPR production (iV and C2 measured by Crystex on the soluble fraction) iV EPR C2(EPR) GP prod. GP split dL / g wt% kg / gcat / h % MC-IE1 5.0 22,96 0.38 13 MC-IE3 4.1 21,81 0.34 14

Claims

CLAIMS 1. A metallocene complex of formula (I)wherein Mt is Zr or Hf; L is O or S; X is a sigma ligand; R1are each independently, same or different from each other, C1-C20-hydrocarbyl, optionally containing up to two heteroatoms of Group 14-16 of the Periodic Table, or form together with the Si atom they are attached to a C4-C8-ring; R2is heteroaryl, C6-C10-aryl, or linear or branched C1-C10-hydrocarbyl, whereby said C6- C10-aryl and heteroaryl are optionally substituted with 1 to 3 R21’; with R21’being C1-C10- hydrocarbyl; R2’ is heteroaryl or C6-C10-aryl, R2’being optionally substituted with 1 to 3 R21’; with R21’ being C1-C10-hydrocarbyl; n are each independently, same or different from each other, an integer from 1 to 5; R3and R4are each independently, H or C1-C20-hydrocarbyl or –OR31, wherein R31is C1- C10-hydrocarbyl, whereby at least one R3and at least one R4is not hydrogen; R51and R51’ are each independently, same or different from each other, C1-C10- hydrocarbyl; andR6and R6’ are each independently, same or different from each other, C(R61)3, with R61 being linear or branched C1-C6-alkyl.

2. A metallocene complex of formula (I) as claimed in claim 1 having formula (I-a)(I-a) wherein Mt is Zr or Hf; X is a sigma ligand; R1are each independently, same or different from each other, C1-C20-hydrocarbyl, optionally containing up to two heteroatoms of Group 14-16 of the Periodic Table, or form together with the Si atom they are attached to a C4-C8-ring; R2is heteroaryl, C6-C10-aryl or linear or branched C1-C10-hydrocarbyl, whereby said C6- C10-aryl and heteroaryl are optionally substituted with 1 to 3 R21’; with R21’being C1-C10- hydrocarbyl; R2’ is heteroaryl or C6-C10-aryl, R2’being optionally substituted with one to three R21’; with R21’ being C1-C10-hydrocarbyl; n are each independently, an integer from 1 to 5; R3and R4are each independently, H, C1-C20-hydrocarbyl or –OR31, wherein R31is C1-C10- hydrocarbyl, whereby at least one R3and at least one R4is not hydrogen; R51and R51’ are each independently, same of different from each other, C1-C10- hydrocarbyl; and R6and R6’ are each independently, same or different from each other, C(R61) 61 3, with R being linear or branched C1-C6-alkyl.

3. A metallocene complex of formula (I) as claimed in claim 1 or 2 having formula (I-b) (I-b)wherein Mt is Zr or Hf; X is a sigma ligand; R1are each independently, same or different from each other, C1-C20-hydrocarbyl, optionally containing up to two heteroatoms of Group 14-16 of the Periodic Table, or form together with the Si atom they are attached to a C4-C8-ring; R2is linear or branched C1-C10-hydrocarbyl; R2’ is heteroaryl or C6-C10-aryl, R2’being optionally substituted with 1 to 3 R21’; with R21’ being C1-C10-hydrocarbyl; R3and R4are each independently, H, C1-C20-hydrocarbyl, or –OR31, wherein R31is C1-C10- hydrocarbyl, whereby at least one R3and at least one R4is not H; R51and R51’ are each independently, same or different from each other, C1-C10- hydrocarbyl; and R6and R6’ are each independently, same or different from each other, C(R61)3, with R61 being linear or branched C1-C6-alkyl.

4. A metallocene complex of formula (I) as claimed in any one of claims 1 to 3 having formula (I-c)wherein Mt is Zr or Hf; X is a sigma ligand; R1are each independently, same or different from each other, C1-C20-hydrocarbyl, optionally containing up to two heteroatoms of Group 14-16 of the Periodic Table, or form together with the Si atom they are attached to a C4-C8-ring; R2is linear or branched C1-C10-hydrocarbyl; R2’ is heteroaryl or C6-C10-aryl, R2’being optionally substituted with 1 to 3 R21’; with R21’ being C1-C10-hydrocarbyl; R3and R4are each independently C1-C20-hydrocarbyl; R51and R51’ are each independently, same or different from each other, C1-C10- hydrocarbyl; and R6and R6’ are each independently, same or different from each other, C(R61)3, with R61 being linear or branched C1-C6-alkyl.

5. A metallocene complex of formula (I) as claimed in any one of claims 1 to 4 having formula (I-d)(I-d) wherein Mt is Zr or Hf; X is a sigma ligand; R1are each independently, same or different from each other, C1-C20-hydrocarbyl, optionally containing up to two heteroatoms of Group 14-16 of the Periodic Table, or form together with the Si atom they are attached to a C4-C8-ring; R2is linear or branched C1-C10-hydrocarbyl; R2’ is heteroaryl or C6-C10-aryl , R2’being optionally substituted with one to three R21’; with R21’ being C1-C10-hydrocarbyl; R3and R4are each independently C1-C10-hydrocarbyl.

6. A metallocene complex as claimed in any one of claims 1 to 5, wherein one or two R3are not H and the R3are the same, and two R4on the phenyl group are not H and these two R4are the same.

7. A polymerization catalyst, comprising, preferably consisting of (i) a metallocene complex of formula (I) as claimed in any one of claim 1 to 6; (ii) a cocatalyst comprising a group 13 element; and (iii) optionally a support.

8. The polymerization catalyst according to claim 7, wherein cocatalyst (ii) is an alumoxane cocatalyst, preferably in the absence of any further cocatalysts.

9. The polymerization catalyst as claimed in claim 7 or 8, supported on silica.

10. A process for the polymerization of propylene, comprising polymerizing propylene and optionally at least one of comonomer selected from ethylene or C4-C10-alpha olefin comonomers in the presence of the polymerization catalyst claimed in any one of claim 7 to 9.

11. A process for the preparation of a heterophasic polypropylene copolymer comprising (I) polymerizing propylene in bulk in the presence of a polymerization catalyst as claimed in any one of claims 7 to 9 to form a polypropylene homopolymer matrix; (II) in the presence of said matrix and said polymerization catalyst and in the gas phase, polymerizing propylene and ethylene to form a heterophasic polypropylene copolymer comprising a homopolymer matrix and an ethylene propylene rubber.

12. A process for the preparation of a heterophasic polypropylene copolymer comprising (I) polymerizing propylene in bulk in the presence of polymerization catalyst as claimed in any one of claims 7 to 9 to form a polypropylene homopolymer; (II) in the presence of said homopolymer and said polymerization catalyst and in the gas phase, polymerizing propylene to form a polypropylene homopolymer matrix; (III) in the presence of said matrix and said polymerization catalyst and in the gas phase, polymerizing propylene and ethylene to form a heterophasic polypropylene copolymer comprising a homopolymer matrix and an ethylene propylene rubber (EPR).

13. A ligand of formula (II)wherein the dotted lines represent a double bond present in between carbons 1 and 2 or 2 and 3 of the indenyl ring;R2’ is C6-C10-aryl or heteroaryl, R2’being optionally substituted with one to three R21’; with R21’ being C1-C10-hydrocarbyl; R4are each independently, H or C1-C10-hydrocarbyl, whereby at least one R4is not H; R51’ is linear or branched C1-C10-hydrocarbyl; and R6’ is C(R61)3, with R61being linear or branched C1-C6-alkyl.

14. A ligand as claimed in claim 13, wherein R2’ is phenyl or thienyl, R2’being substituted with 1 or 2 R21’, with R21’ being methyl.

Images