332results about "Metallocenes" patented technology

The invention provides a preparation method and application of an asymmetric dicyclopentadienyl dialkoxy zirconium compound, and the preparation method comprises the following steps: (1) mixing a solvent with ZrCl4 and sodium cyclopentadienyl CpNa, and carrying out a reaction to obtain CpZrCl3; (2) the CpZrCl3 obtained in the step (1) and R1 substituted sodium cyclopentadienyl R1CpNa are subjected to a mixed reaction, and (R1Cp) CpZrCl2 is obtained; and (3) mixing the (R1Cp) CpZrCl2 obtained in the step (2) with alkoxy sodium salt R2Na, and carrying out a reaction so as to obtain the asymmetric dicyclopentadiene dialkoxy zirconium compound. According to the method, the substitution reaction of three sodium salts is used for replacing the ligand replacement reaction in the prior art, so that the reaction steps are shortened, the use of unnecessary raw materials is avoided, the production cost is reduced, and the obtained target product is high in yield and high in purity.

The invention discloses a method for preparing a metal complex, the general structural formula of the metal complex is CpM (NR1R2) 3, R1 and R2 are Me or Et, and M is Zr or Hf; the preparation method comprises the following steps: S1, adding magnesium dicyclopentadienyl into a tetrahydrofuran solvent, and stirring to form a tetrahydrofuran solution of magnesium dicyclopentadienyl for later use; s2, adding a metal chloride, N, N-diisopropylethylamine and a tetrahydrofuran solvent into a reaction kettle, cooling to-10 to-5 DEG C, slowly introducing an amine compound, stirring for 2 hours after the amine compound is introduced, then slowly heating to 30-40 DEG C, stirring and reacting for 16 hours, and filtering to obtain filtrate; and S3, controlling the temperature of the filtrate at 20-30 DEG C, adding a tetrahydrofuran solution of magnesium dicyclopentadienyl, slowly heating to 50-60 DEG C, carrying out stirring reaction for 12 hours, filtering after stirring to obtain filtrate, and carrying out distillation and rectification separation to obtain the target product CpM (NR1R2) 3.

The invention provides a phosphorus-nitrogen coordinated metallocene compound and a preparation method and application thereof, the compound has a structure as shown in a formula I: in the formula I, M is selected from IVB group metals in the periodic table of elements; r1 is selected from hydrogen, halogen, C1-C10 direct or branched alkyl, and C1-C3 alkoxy; r2 is selected from hydrogen and C1-C6 straight chain or branched chain alkyl; y is selected from chlorine, C1-C3 alkyl substituted or unsubstituted by trimethylsilyl, and amino substituted by trimethylsilyl. The phosphorus-nitrogen coordinated metallocene compound provided by the invention has relatively high thermal stability, catalytic activity and comonomer insertion rate, and can realize high-temperature solution polymerization of ethylene and norbornene.

The present invention relates to the field of olefin polymerization, and discloses a metallocene compound, a catalyst composition, and a method for preparing an ethylene-cyclic olefin copolymer. The metallocene compound has a structureas shown in formula (1), and in formula (1) M is a tetravalent transition metal atom; and X1 and X2 are each independently a halogen atom, an alkyl having 1 to 10 carbon atoms, an aromatic group having 6 to 12 carbon atoms or an N,N-dialkylamine group having 2 to 8 carbon atoms. Using the catalyst composition of the present invention in the preparation of an ethylene-cyclic olefin copolymer has the advantages of high catalytic activity, good copolymerization performance, and high molecular weight of an obtained polymer.

The invention discloses a pre-transition metal compound containing nitrogen and phosphine as well as a preparation method and application of the pre-transition metal compound. The compound has a structure as shown in a formula (1). Wherein R1, R2 and R3 are each independently selected from a group consisting of H, a C1-20 alkyl group, a C1-20 alkoxy group and a halogen; r4 and R5 are each independently selected from a group consisting of H, a C1-4 hydrocarbyl group, a C6-12 aryl group, and a C7-16 aryl group substituted by a C1-4 hydrocarbyl group; mt is a group IVB metal element; m is equal to 1-3; r < 1 >, R < 2 >, R < 3 >, R < 4 > and R < 5 > are respectively and independently hydrogen, alkyl of C < 1-20 > or aryl of C < 6-30 >; e is O or S; x is an atom or group bonded to an Mt element, and X is at least one group selected from the group consisting of C1-10 hydrocarbon groups and halogens; and n is an integer and satisfies the valence of Mt bonding. The catalyst containing the compound has the advantages of high catalytic activity and low cost.

The present invention is a composition comprising a) a compound functionalized with at least one Si-H group; b) a compound functionalized with at least one olefin group; and c) compound of Formula 1: where x, R1, R2, and R3 are as defined herein. The composition provides a pre-catalyst that decomposes quickly to a platinum state that promotes hydrosilylation upon irradiation with light of the appropriate wavelength.

The invention relates to a method for preparing (cyclopentadienyl) tris (dimethylamino) hafnium by using nuclear magnetic control, which comprises the following steps: S1, carrying out heating reflux reaction on hafnium tetrachloride, cyclopentadiene and dimethylamine in the presence of n-butyllithium and n-hexane, and after reacting for a certain time, taking supernate to detect a nuclear magnetic hydrogen spectrum; s2, calculating the ratio a of the integral area of the characteristic peak A to the integral area of the characteristic peak B according to the nuclear magnetic hydrogen spectrum, judging whether a is in a target range or not, if a is in the target range, terminating the reaction, separating a liquid phase, distilling and collecting a crude product; and if a value is greater than the maximum value of the target range, adding cyclopentadiene into the reaction system to continue the reaction, and if a value is less than the minimum value of the target range, continuing the reaction until the ratio of the integral area of the characteristic peak A to the integral area of the characteristic peak B in the nuclear magnetic hydrogen spectrum of the reaction supernatant is within the target range, terminating the reaction, separating the liquid phase, distilling and collecting a crude product. The method can effectively improve the safety of the production process, the raw material conversion rate and the product purity.

The application relates to the chemical technology field and discloses a metallocene compound, a preparation method and a metallocene catalyst and application thereof. The metallocene compound provided by the application comprises a fluorenyl ligand, a metallocene ligand, a bridging structure and a metal part in a chemical structure. By introducing an adsorption group with a micropore effect into the fluorenyl ligand, the metallocene compound can exhibit strong saturated adsorption capacity when interacting with cocatalysts such as organic boron and organic aluminum, the cocatalyst concentration around the metal center can be improved, the activity and thermal stability of the catalyst can be significantly enhanced, the metallocene compound can catalyze alpha-olefin polymerization with high activity, the amount of the cocatalyst is reduced, and the production cost of polyolefin is reduced.

The invention relates to the field of magnetic resonance imaging. The invention relates to a nanovector comprising: - an external layer comprising a plurality of amphiphilic molecules, said amphiphilic molecules comprising at least one hydrophobic moiety linked to at least one hydrophilic moiety, and - a core comprising at least one organometallic complex having a paramagnetic property that can be activated by oxidation, said organometallic complex being functionalized by at least one hydrophobic moiety, the oxidation of the organometallic complex being controllable by light. The invention also relates to a method of magnetic resonance imaging.

The invention discloses a high-purity column chromatography purification method of a burning rate catalyst Cartosin, and aims to solve the problems of low purity and high HPLC (High Performance Liquid Chromatography) cost in the traditional method. According to the method, 200-300-mesh silica gel is used as a stationary phase for wet column packing, a Cartosin crude product is dissolved in a low-polarity solvent for sample loading, and a silica gel column is obtained; a mixed solvent composed of a non-polar solvent and a polar solvent is adopted as an eluent for gradient elution, a target fraction is monitored and collected through TLC, and then a product is obtained through rotary evaporation and vacuum drying; according to the method, the purity of cartosin can be increased from about 60% to 93.0% or above, equipment is simple, the cost is low, the process is stable, large-scale amplification from a laboratory to industrial production is easy, and the method is suitable for the requirement of a high-performance propellant.

According to the present disclosure, a catalyst composition that can not only exhibit high activity in an olefin polymerization reaction and thus contribute to reducing catalyst costs, but also exhibit high copolymerizability which can secure excellent processability and long-term physical properties, and thus, is suitable for providing polymers for pipes, and a method for preparing an olefin polymer using the catalyst composition is provided.

The invention discloses a benzoxphosphine ligand and a complex and application thereof. The structure of the benzoxphosphine ligand is shown as a formula (I), in the formula (I), R1 is alkyl or aryl substituted oxazolidinyl or imidazoline, R2 is alkyl and / or aryl, and R3 is at least one of fluorine, carbazolyl and 2, 6-dimethoxyphenyl. According to the benzoxphosphine ligand disclosed by the invention, the metal iridium complex can be used as a catalyst to be applied to an asymmetric hydrogenation reaction of alpha-phenyl vinyl diethyl phosphate, and has excellent activity and relatively high enantioselectivity; moreover, the benzoxphosphine ligand disclosed by the invention can be directly synthesized from simple and easily available chiral aldehyde, and the preparation method is simple and easy to operate.

The invention discloses a high-temperature-resistant high-activity metallocene catalyst and application thereof, and belongs to the technical field of olefin polymerization catalysts. The catalyst provided by the invention is formed by taking a fused ring structure with a rigid framework as a ligand framework and coordinating with transition metal titanium, zirconium or hafnium, so that the catalyst has excellent thermal stability and high catalytic activity, and is suitable for copolymerization reaction of ethylene and alpha-olefin. In the high-temperature polymerization reaction, the catalyst provided by the invention realizes efficient copolymerization of ethylene and alpha-olefin, and the obtained copolymer not only has higher molecular weight, but also has higher comonomer insertion amount, so that the structure and performance of the product are effectively regulated and controlled.

Specific organometallic compounds of Formula I: Qx-Sn-(A1R1′z)4-x or Formula II: Sn(NR2(CH2)nA2)2 useful for the deposition of high purity tin oxide, as well as methods of using such compounds are disclosed. Also disclosed are compositions of organometallic compounds useful for the deposition of high purity tin oxide that in combination improve stability. Also disclosed are processes for dry etching tin oxide with a particular etchant gas and / or a process for dry etching a substrate using a particular etchant gas with a specific additive.

The invention discloses a phosphorus-containing oxynitride compound based on a cycloarane skeleton and a ferrocene skeleton and a preparation method and application thereof, the phosphorus-containing oxynitride compound based on the cycloarane skeleton and the ferrocene skeleton is selected from at least one of compounds with structural formulas as shown in a formula I and a formula II, wherein Ar is independently selected from phenyl and C7-C15 substituted aryl; the substituent group of the substituted aryl group is selected from one of C1-C4 alkyl groups and methoxyl groups. According to the invention, a class of novel phosphorus-nitrogen-oxygen-containing compounds which have two planar chirality and are based on the cycloarane skeleton and the ferrocene skeleton can be effectively synthesized; as a ligand, the compound shows excellent catalytic activity and enantioselective control ability in asymmetric hydrogenation of an iridium-catalyzed N-aryl indolone compound or a heterobiaryl ketone compound.

The application relates to a method for synthesizing ferrocene phosphine oxide compounds. Specifically, a ferrocene-substituted compound, diaryl phosphine oxide is used as raw material to realize C-H phosphine oxide reaction of ferrocene under the promotion of electricity. The application has the following advantages: the ferrocene-substituted compound is directly used as a C-H donor without guidance, no additional oxidant and metal catalyst are needed, the condition is mild, the substrate range is wide, and the yield is good.

The present disclosure relates to catalysts, polyethylene polymers, polymerization processes for making such polyethylene polymers, and films made therefrom. In some embodiments, the catalyst system includes a first catalyst compound. The first catalyst compound is represented by formula (I). At least one pair of R4 and R5, R5 and R6 or R6 and R7 of formula (I) is linked to form a first substituted or unsubstituted fully saturated ring fused to the indenyl ring, and at least one pair of R11 and R12, R12 and R13 or R13 and R14 is linked to form a second substituted or unsubstituted fully saturated ring fused to the indenyl ring. The catalyst system further includes a second catalyst represented by formula (III). At least one pair of R7 and R8, R8 and R9, or R9 and R10 of formula (III) is linked to form a substituted or unsubstituted fully saturated ring fused to the indenyl ring.

The application relates to the technical field of metal catalysts, in particular to a cyclic bridged metallocene catalyst and a preparation method and application thereof, wherein the cyclic bridged metallocene catalyst has a structure shown in formula I. The cyclic bridged metallocene catalyst provided by the application has high catalytic activity, good high-temperature resistance and good copolymerization activity. Compared with the prior art, the structure is convenient to modify, and when the cyclic bridged metallocene catalyst is used to catalyze the copolymerization reaction of ethylene and alpha-olefins such as 1-butene, 1-hexene and 1-octene, a polymer product with high molecular weight and high comonomer insertion rate can be obtained, which helps to enhance the competitive ability of the polyolefin polymer material technology market in China.

Compounds suitable for use in the polymerization of olefins, such as ethylene, are described. Further described are processes for polymerizing olefins using the described compounds. The compounds exhibit high polymerization activity and provide polyolefins with commercially desirable properties, including high molecular weight and low polydispersity.

The invention provides a mono-titanocene metal complex, a catalyst composition, a propylene and 5-vinyl-2-norbornene copolymer and a preparation method, and the mono-titanocene metal complex has a structure as shown in a formula (I). The mono-titanocene metal catalytic system provided by the invention has the characteristic of high catalytic activity; and the propylene and 5-vinyl-2-norbornene copolymer with high molecular weight, narrow molecular weight distribution and high glass transition temperature can be prepared.

The present invention relates to an asymmetric catalytic hydrogenation synthesis method for a brivaracetam intermediate. The synthesis method comprises the step of: in a hydrogen atmosphere, in a solvent, a compound represented by formula I is subjected to asymmetric hydrogenation reduction in the presence of an alkali and a catalyst which is formed by a planar chiral metallocene ligand and a ruthenium salt to form a compound as represented by formula II, wherein the reaction formula is shown below. In the present invention, the catalyst used in the asymmetric catalytic hydrogenation synthesis method has low cost, the conversion rate of raw materials is high, and the DR value of the obtained final product can reach 99: 1 or above; and the present invention is suitable for industrial production

The invention provides a preparation method of a bridged metallocene compound capable of improving the utilization rate of a ligand. According to the method, the utilization rate of the bridged double-metallocene ligand is increased through the ether complex, so that the total yield of the bridged metallocene catalyst with two configurations of rac and meso is high.

Yttrium complexes and related methods are provided. The method for preparing the yttrium complexes includes contacting a metal alkylcyclopentadienyl compound with a yttrium trihalide compound in a non-coordinating solvent to obtain a tris(alkylcyclopentadienyl)yttrium complex. The composition includes the tris(alkylcyclopentadienyl)yttrium complex.

The brand new metallocene catalyst is synthesized, the preparation method is simple, the raw material source is wide, the yield is high, the catalyst has high catalytic activity on styrene polymerization, the synthesis bottleneck of syndiotactic polystyrene with side chains symmetrically distributed on the two sides of a main chain at intervals is easily broken through, and the metallocene catalyst has wide application prospects. The metallocene catalyst prepared by the invention belongs to the technical field of organic catalysis.

The application discloses a ferrocenyl diamine monomer, a polyimide and a preparation method and application thereof, the ferrocenyl diamine monomer is prepared by reacting a ferrocene carbonyl compound with aniline, so as to introduce a ferrocene structural unit into the diamine monomer, and form a novel ferrocenyl diamine monomer for preparing the polyimide; the ferrocenyl diamine monomer is polymerized with a tetracarboxylic dianhydride and is subjected to an imidization reaction to prepare the polyimide, and the polyimide is used as a burning rate catalyst; the polyimide can not only effectively ensure the ferrocene content, has good thermal stability, greatly reduce the high-temperature decomposition temperature of an oxidant, has a smaller influence on the low-temperature decomposition temperature, and can significantly reduce the migration rate, effectively improve the performance of the ferrocene polymer burning rate catalyst, and is beneficial to the use safety.

An organometallic compound having a structure represented by formula (I) and a method for manufacturing a metal ruthenium film are provided.wherein R is C1-C6 alkyl; and n is an integer of 1 to 4.

The present invention provides a metallocene complex and a method for producing the same, a catalyst composition, an olefin polymerization method, and an olefin polymer. The metallocene complex has a structure represented by formula I. The catalyst composition containing the metallocene complex of the present invention exhibits improved catalytic activity, has a high ability to control the structural regularity of the conjugated diolefin structural unit, and has a high ability to copolymerize ethylene with a conjugated diolefin. In addition, the metallocene complex of the present invention has a simple production process and low cost. [Formula 1] JPEG2025515221000023.jpg86169

The present invention provides a starting material coordination compound for forming a metal thin film, the starting material coordination compound having a central metal and a ligand coordinated to the central metal, (i) the atomic polarizability of the central metal being 45-51, and the starting material coordination compound for forming a metal thin film satisfying the following conditions: a polarization volume < = 200 and a relative dielectric constant < = 2.20; or (ii) the atomic polarizability of the central metal is 52-90, and the raw material coordination compound for forming a metal thin film satisfies the following conditions: polarization volume < = 240 and relative permittivity < = 2.50.

The application provides a preparation method and application of a novel ferrocene pyridine hydrazine manganese complex. The manganese complex has multiple advantages such as low cost, simple synthesis and air stability. Meanwhile, the provided manganese complex can be applied to an asymmetric hydrogenation reaction and has certain industrial application prospect.

The present application relates to the technical fields of organic metal compound synthesis, and discloses a production process method for synthesizing ferrocene based on one-pot method, which takes sodium, anhydrous ferrous chloride and dicyclopentadiene as raw materials, and completes the whole process of dicyclopentadiene depolymerization, sodium cyclopentadiene generation and ferrocene coordination synthesis in a non-protic solvent through gradient temperature control in one-pot method.The present application discards the disadvantages of multi-step reaction in traditional process, and does not need to prepare cyclopentadiene by pre-depolymerizing dicyclopentadiene, thus greatly simplifying the production process, reducing energy consumption and raw material loss, and achieving the product conversion rate of up to 85%, the purity of up to 99%, simple and controllable operation, adaptation to industrialized continuous production, and good economic and environmental benefits.