528results about "Metallocenes" patented technology

The invention provides a novel chiral ferrocene bridged binaphthyl skeleton phosphine ligand and application thereof. The ligand has the advantages of low cost, simplicity in synthesis, air stability and the like. The ligands have good catalytic activity and enantioselectivity in the asymmetric hydrogenation reaction of ketone, and have certain industrial application prospects in the synthesis of pharmaceutical molecules.

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 dicarbonyl cyclopentadienyl cobalt complex as well as a preparation method and application thereof, and belongs to the technical field of organic metal synthesis. The preparation method of the dicarbonyl cyclopentadienyl cobalt complex specifically comprises the following steps: (1) dissolving cobalt octacarbonyl in carbon monoxide pre-saturated dichloromethane, and continuously introducing carbon monoxide gas for protection to obtain a reaction system; (2) dissolving cyclopentadiene in dichloromethane, and continuously introducing carbon monoxide gas for protection to obtain a cyclopentadiene solution; (3) adding a cyclopentadiene solution into the reaction system, heating and stirring for reaction; and (4) carrying out pressurized distillation and rectification on the reaction system. According to the invention, the carbon monoxide protective gas is introduced and the cyclopentadiene solution is prepared in the whole process to reduce the decomposition of the raw materials and reduce the generation of byproducts, so that the subsequent purification difficulty is reduced, and the reaction yield and the economic benefit of the product are improved.

Yttrium complexes and related methods are provided. A method of making an yttrium complex comprising contacting a metal alkyl cyclopentadienyl compound with an yttrium trihalide compound in a non-coordinating solvent to obtain a tris (alkyl cyclopentadienyl) yttrium complex. A composition includes a tris (alkylcyclopentadienyl) yttrium complex.

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 ferrocenyl carboxylic acid anthracene methyl ester for photosensitive resin, and relates to the field of photopolymerization. The invention also comprises a photosensitive resin composition containing the ferrocenyl carboxylic acid anthracene methyl ester, a photosensitive dry film containing the ferrocenyl carboxylic acid anthracene methyl ester, and applications of the photosensitive resin composition and the photosensitive dry film. The ferrocenyl carboxylic acid anthracene methyl ester disclosed by the invention has the characteristics of photosensitivity and low migration, can improve the adhesive force of a photosensitive resin composition on various metal surfaces, and can be widely applied to the photocuring fields of dry films, paints, coatings, printing inks, molding materials and the like.

The invention relates to a preparation method of trimethoxy pentamethyl cyclopentadienyl titanium, which comprises the following steps: (1) vacuumizing a reactor for replacement, detecting the content of moisture and oxygen in gas in a reaction kettle by an instrument, and stopping vacuum replacement when the content is lower than 50ppm; (2) pentamethyl cyclopentadienyl titanium trichloride, ammonia and a solvent are added into a reactor, methanol is dropwise added into the reactor, a crude product trimethoxy pentamethyl cyclopentadienyl titanium is obtained through a reaction, the reaction temperature ranges from-30 DEG C to 50 DEG C, and the pressure ranges from-0.05 MPa to 0.05 MPa; (3) filtering and desalting the crude product trimethoxy pentamethyl cyclopentadienyl titanium obtained in the step (2) in an inert environment; and (4) the filtrate obtained in the step (3) is refined, pure trimethoxy pentamethyl cyclopentadienyl titanium is obtained, and the metal purity reaches 5N. Methanol is used as a raw material, the synthesis route can be shortened, the cost is reduced, and meanwhile, the material is relatively safe.

The invention relates to the technical field of concrete, and discloses mirror concrete and a preparation method thereof. Comprising the following components in parts by weight: 360 to 400 parts by weight of cement, 60 to 100 parts by weight of fly ash, 250 to 320 parts by weight of fine aggregate, 300 to 500 parts by weight of coarse aggregate, 1 to 3 parts by weight of a polycarboxylic acid water reducer, 4 to 6 parts by weight of an additive, 2 to 3 parts by weight of modified ferrocene, 80 to 100 parts by weight of water, 15 to 20 parts by weight of water-soluble acrylic resin and 2 to 3 parts by weight of carboxyl modified silane. The mirror concrete provided by the invention has good gloss and mechanical properties.

The invention discloses a ferrocene-based D-A type multi-system conjugated small molecule synthesis method, which comprises: carrying out a heating reaction in an organic solvent by using a ferrocenyl compound and a bromophenyl compound as raw materials and using a palladium complex as a catalyst, and after the reaction is completed, carrying out extraction, column chromatography and recrystallization to prepare an intermediate; the obtained intermediate and a 4-pyridine boric acid compound are used as raw materials, a palladium complex is used as a catalyst, a heating reaction is conducted in an organic solvent, and after the reaction is finished, cooling, extraction, column chromatography and recrystallization are conducted to prepare the D-A type multi-system conjugated small molecules. The invention also discloses a memory device with a sandwich structure and application of the memory device to ultra-high density information storage. The small molecular material prepared by the invention not only can realize ternary information storage performance, but also greatly improves the stability of the device through stable redox cycle of the ferrocene group, and realizes long-time stable ultrahigh-density information storage.

This invention relates to the field of olefin polymerization, and discloses a metallocene compound, a catalyst composition using the metallocene compound, an olefin polymerization method using the catalyst composition, and the application of the metallocene compound or the catalyst composition in olefin polymerization. The metallocene compound has the structure shown in formula (1), where M is a tetravalent transition metal atom; X 1 and X 2 Each group is independently a halogen atom, an alkyl group with 1-10 carbon atoms, an aromatic group with 6-12 carbon atoms, or an N,N-dialkylamine group with 2-8 carbon atoms. Using the catalyst composition of the present invention provides advantages such as high catalytic activity, good copolymerization performance, and high molecular weight of the obtained polymer.

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.

Compounds derived from celecoxib and valdecoxib, and methods of use thereof, are disclosed. The compounds are useful for, inter alia, identifying and localizing the site of pathology and / or inflammation responsible for the sensation of pain in a patient; for identifying the sites of primary, secondary, benign, or malignant tumors; and for diagnosing infection or confirming or ruling out suspected infection. The compounds contain a radioactive agent which permits imaging. The compounds concentrate at sites of increased cyclooxygenase expression, such as areas of increased COX-2 expression, thus revealing the sites of increased prostaglandin production, which is correlated with pain and inflammation, and correlated with tumor presence and / or location. Identifying areas of increased COX expressing can also aid in screening for infections, assessing efficacy of diagnosis and treatment of rheumatoid arthritis, and assessing the need for treatment with opioid drugs.

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.

This invention discloses an ethylene copolymer containing ethylene structural units derived from ethylene and conjugated diene structures derived from conjugated dienes. This ethylene copolymer is formed by contacting ethylene and the conjugated diene with a transition metal complex of Formula I. In the ethylene copolymer according to this invention, the content of ethylene structural units can vary over a relatively wide range while maintaining a high content of cis-1,4-structural units.

This invention relates to the field of olefin polymerization, and discloses a metallocene compound, a catalyst composition using the metallocene compound, an olefin polymerization method using the catalyst composition, and the application of the metallocene compound or the catalyst composition in olefin polymerization. The metallocene compound has the structure shown in formula (1), where M is a tetravalent transition metal atom; X 1 and X 2 Each group is independently a halogen atom, an alkyl group with 1-10 carbon atoms, an aromatic group with 6-12 carbon atoms, or an N,N-dialkylamine group with 2-8 carbon atoms. Using the catalyst composition of the present invention provides advantages such as high catalytic activity, good copolymerization performance, and high molecular weight of the 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.

Embodiments of the present disclosure are directed towards polyolefin compositions, useful for films, made with asymmetrical hafnium metallocenes having an n-propyl cyclopentadienyl ligand, processes utilizing the polyolefin compositions, and products made with the compositions.

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.

An apparatus includes a distillation container configured to receive a mixture. The apparatus includes a column fluidly connected to the distillation container. A mesh is disposed in the column. The apparatus includes a plurality of conduits fluidly connected to respective vacuums. A fractionating head is fluidly connected to the column. The column is fluidly connected between the distillation container and the fractionating head.

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.

Disclosed herein are synthetic methods for increasing the solubility of metallocenes, such as metallocenes containing perfluorobenzyl (indene) groups. These methods can include alkylating a perfluoroaromatic ring of a metallocene precursor using a lithium alkylate reagent in a one-pot reaction. In addition, these processes may be employed without changing reaction equipment or conditions, without separating new intermediates, and at the same time, generally retaining the desired catalyst characteristics.

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.