86 results about "Imine ligands" patented technology

Disclosed herein is the use of manganese, iron, cobalt, or nickel complexes containing tridentate pyridine di-imine ligands as hydrosilylation catalysts. These complexes are effective for efficiently catalyzing hydrosilylation reactions, as well as offering improved selectivity and yield over existing catalyst systems.

The invention discloses a catalyst system for ethylene polymerization, comprising three components a, b and c. The component a is a pyridine diimine ligand with a structural formula (I) or a structural formula (II); the component b is an acetylacetone salt compound; the component c is an aid catalyst; a mol ratio of the component b to the component a is (0.01-100):1; and a mol ratio of the component c to the component b is (10-10,000):1. The invention also discloses the applications of the catalyst system in the preparation of single-peak distributed polyethylene, double-peak distributed polyethylene, polyethylene with super high molecular weight and an ethylene oligomer by the ethylene polymerization.

Disclosed herein are cobalt complexes containing terdentate pyridine di-imine ligands and their use as efficient and selective dehydrogenative silylation, hydrosilylation, and crosslinking catalysts.

The invention discloses a catalyst precursor and its preparation method, a catalyst and its application, and an ethylene polymerization method. The catalyst precursor is a bimetallic catalyst precursor which has an open structure shown as a formula I and is based on a salicylaldehyde imine ligand, the preparation method of the catalyst precursor is as follows: under complexation reaction conditions, contacting a compound having a structure shown as a formula IV with a compound with a molecular structure general formula of MCl4 (THF) 2 in an organic solvent; the catalyst provided by the invention comprises the catalyst precursor and alkyl aluminoxane; the invention also provides the application of the catalyst in olefin polymerization, the invention also provides the ethylene polymerization method which is as follows: under olefin polymerization conditions, in the presence of an organic solvent, contacting ethylene with the catalyst precursor and the alkyl aluminoxane for polymerization. The preparation method of the catalyst precursor is simple, and the catalyst is high in catalytic efficiency. The formula I and the formula IV are shown in the specification.

The invention relates to a preparation method of low-entanglement and ultrahigh-molecular-weight polyethylene powder and a plate material thereof. The preparation method comprises the following steps: loading an acetylacetone salt compound and a bis(imino)pyridyl ligand main catalyst on a mesoporous molecular sieve ZSM-41, and depositing a layer of polymer film on the ZSM-41 so as to obtain a low-entanglement and ultrahigh-molecular-weight polyethylene heterogeneous catalyst. Vinyl polymerization is carried out at 10-50 DEG C; in a process of polymerizing the catalyst, a grown polyethylene segment is low in possibility of being entangled, so that the obtained UHMWPE powder is low in entanglement; a UHMWPE plate material can be prepared by processing the UHMWPE powder at a temperature (50-120 DEG C) which is not greater than the melting temperature, and the plate material is relatively high in tensile strength and elongation at break.

Disclosed herein are cobalt complexes containing terdentate pyridine di-imine ligands and their use as efficient, reusable, and selective dehydrogenative silylation, crosslinking, and tandem dehydrogenative silylation-hydrogenation catalysts.

The invention discloses a beta-hydroxy imine titanium metal catalyst for polymerizing ethylene and a method for polymerizing ethylene. The catalyst can be prepared by the following steps: reacting an imide compound with lithium diisopropylamide; reacting the reacted imide compound with aldehyde or ketone to generate a beta-hydroxy imine ligand; and reacting the ligand with a titanium metal compound to generate the beta-hydroxy imine titanium metal catalyst. By adjusting the substituent group structure of the imide compound and the types of the aldehyde or ketone and the polymerization conditions, the controllability of the catalytic polymerization on the ethylene can be realized. The catalyst is a novel non-metallocene transition metal catalyst and has the characteristics of novel structure, high catalytic activity, easily-accessible raw materials, convenient preparation and the like.

The invention relates to a keto-imidazoline-2-imine [N,O] bidentate nickel and palladium complex as well as a preparation method and application thereof. The preparation method comprises the followingsteps: reacting a keto-imidazoline-2-imine ligand with a hydrogen withdrawing reagent and a metal precursor in sequence to prepare a keto-imidazoline-2-imine [N,O] bidentate nickel and palladium complex; and the structural formula of the prepared complex is one of formulas shown in the specification. The complex and a cocatalyst form a catalyst composition, the complex or the catalyst compositionis used for catalyzing homopolymerization or copolymerization of olefin monomers, and the specific process is as follows: under the protection of nitrogen, firstly dissolving the complex or the catalyst composition in a solvent, then adding an olefin monomer, and conducting reacting for a period of time at a certain temperature and under a certain pressure to prepare the olefin polymer. The complex and the catalyst composition provided by the invention have relatively high catalytic activity, high tolerance to polar monomers and relatively low application cost.

The invention discloses a metal miscellaneous ligand catalyst precursor based on a salicylaldehyde imine ligand, as well as a synthesis method of the catalyst precursor and an application of the catalyst precursor in olefin polymerization. The catalyst precursor comprises two different salicylaldehyde imine ligands and transition metal of the IV group and can be rapidly synthesized by raw materials including the salicylaldehyde imine ligands, titanium tetrachloride and potassium hydride at normal temperature, the operation is simple and time-saving, and the yield is doubled compared with that of a conventional method. When a catalyst formed of the precursor and alkylaluminoxane catalyzes olefin homopolymerization or copolymerization, the activity is in the magnitude order of 106g.mol<-1>(Ti).h<-1>, the molecular weight of the obtained copolymer is about 150,000, and the dispersity is between 1.2 and 3.5. Compared with a single ligand metal catalyst, a miscellaneous ligand catalyst shows the advantages of both parent bodies or even exceeds a parent catalyst.

Disclosed herein are cobalt complexes containing pyridine di-imine ligands and chelating alkenyl-modified silyl ligands, and their use as hydrosilylation and/or dehydrogenative silylation and crosslinking catalysts. The cobalt complexes also exhibit adequate air stability for handling and manipulation.

Disclosed herein are dialkyi cobalt complexes containing pyridine di-imine ligands and their use as catalysts for hydrosilylation, dehydrogenative silytation, and/or crosslinking processes. The present invention provides dialkyi cobalt complexes. More specifically, the invention provides dialkyt cobalt pyridine diimine complexes substituted with alkyl or alkoxy groups on the imine nitrogen atoms. The cobalt complexes can be used as catalysts for hydrosilylation and/or dehydrogenative silylation processes.

The invention belongs to the technical field of chemical catalyst, particularly relates to a metal olefin polymerization catalyst containing 8-hydroxyquinoline imine ligand and a preparation method thereof. The expression formula of the catalyst is MLCl3 or CP'MLCl2, wherein L represents tridentate anionic ligand which contains N and O atoms and is capable of coordinating with metals. The catalyst has a peculiar and novel structure and has high catalysis activity on catalytic vinyl polymerization, and is simple to prepare; a component A and a component B methylaluminoxane or modified methylaluminoxane of the catalyst are matched to be used for the catalyticvinyl polymerization reaction so as to prepare high molecular weight polyethylene product.

The invention provides a bimetallic complex of a phenoxy imine ligand skeleton, and a preparation method and application thereof. The bimetallic complex has a structural expression shown in the specification. The phenoxy imine bimetal complex provided by the invention shows very good catalytic activity and thermal stability when being used for catalyzing olefin polymerization and ethylene/alpha-olefin copolymerization reaction. The olefin homopolymer has the characteristics of high linearity and high melting point, the copolymerization product contains a certain amount of alkyl branched chains, the melting point is low, the olefin homopolymer has the performance of a polyolefin elastomer, and the potential application range of the olefin homopolymer is widened.

The invention discloses an amino imine ligand, which has a structure represented by a formula I, wherein R5 is selected from H and C1-C20 saturated or unsaturated alkyl, R1-R10 are respectively and independently selected from H, halogen, C1-C24 saturated or unsaturated hydrocarbyl and C1-C24 saturated or unsaturated alkoxy, R1-R3, R9 and R10 are optionally cyclized with each other, and R4-R8 are optionally cyclized with each other. The coordination compound formed by the amino imine ligand has high catalytic activity when applied to olefin polymerization, and a polymer with narrow molecular weight distribution is obtained.

The invention discloses a synthesis method of cinnamate, cinnamonitrile, cinnamamide and derivative thereof. According to the synthesis method, the cheap and easily-available, non-toxic or low-toxicity and high-stability sulfoxide compound replaces the traditional toxic phosphine ligand or imine ligand sensitive to air and difficult to synthesize, tetra-aryl tin is used as an arylation reagent which reacts with alkene to generate corresponding cinnamate, cinnamonitrile, cinnamamide and derivative thereof. The synthesis method disclosed by the invention has the advantages of easiness in operation, mild reaction conditions, high atom utilization rate, low production cost and high yield, and is suitable for industrial production.

The invention relates to aromatic amine based on a rigid terphenyl structure, an alpha-diimine ligand, a nickel catalyst and a preparation method and application of the aromatic amine, the alpha-diimine ligand and the nickel catalyst, and belongs to the technical field of catalysts. The structural formula of the nickel catalyst is shown as a formula (III) or a formula (IV), and the nickel catalyst has excellent performance in preparation of polyethylene by catalyzing ethylene polymerization: under the ethylene pressure condition of 8bar, the polymerization time is 10 minutes, and ultrahigh molecular weight polyethylene can be obtained; under the ethylene pressure condition of 1 bar, the ultra-high molecular weight polyethylene can still be obtained after the polymerization time is 30 minutes; and the catalyst has the advantage of high activity, can still maintain the high activity of 2.1 * 10 < 6 > g mol <-1 > h <-1 > even at 150 DEG C, and shows extremely excellent thermal stability.

The invention discloses a fluorine-containing pyridine imine ligand, a transition metal complex thereof and an application of the ligand to polyisoprene synthesis, and belongs to the field of new compounds and metal organic synthesis. The complex is used for polyisoprene synthesis including the steps: dissolving cocatalysts, a pyridine imine transition metal complex and an isoprene monomer in a solvent; performing stirring reaction for 2-4 hours under the condition of the temperature of 25 DEG C; performing separation and purification to obtain a polyisoprene product. The polyisoprene synthesis method is efficient and environmentally friendly, has quite high activity and selectivity, and provides guidance for preparation of novel iron and cobalt catalysts and catalytic isoprene polymerization reaction mechanisms.

Disclosed herein are novel platinum-based analogs with a single substituted imine ligand: R₇RC═NR₈, wherein the R₇RC═NR₈ functional group is covalently bonded to the platinum through nitrogen. The analogs also have nitrogen donor ligands capable of forming hydrogen bonds with the bases in DNA or RNA, and one or more leaving groups which can be displaced by water, hydroxide ions or other nucleophiles, which is thought to form active species in vivo, and then, form cross-linked complexes between nucleic acid strands, principally between purines in DNA (or RNA), i.e., at the Guanine or Adenine bases, thereof. These platinum analogs may also be more easily transported into tumor cells, due to their increased lipophilicity and are likely to be useful as anti-neoplastic agents, and in modulating or interfering with the synthesis or replication or transcription of DNA or translation or function of RNA in vitro or in vivo, as they are potentially capable of forming a platinum coordinate complex with a intact or nascent DNA or RNA and thereby interfering with cellular synthesis, transcription or replication of nucleic acid polynucleotides.

The invention discloses pyridine imine ligands, pyridine imine palladium complexes based on the pyridine imine ligands and catalytic application of the pyridine imine palladium complexes. A series ofpyridine imine palladium catalysts with steric hindrance effects are obtained through the pyridine imine ligands with aryl substituents of different structures. The obtained catalysts have high activity, can catalyze alpha-olefin polymerization to obtain highly branched polyolefin and can catalyze alpha-olefin and polar monomers to be copolymerized to obtain polyolefin copolymers with a high insertion ratio, and the catalysts can regulate and control the molecular weight of polyolefins and polyolefin copolymers by changing the structure of aryl substituent groups.

The invention relates to a bisphenol oxygen-imine ligand zirconium compound, as well as a preparation method and application thereof. The method comprises the steps of after reacting a bisphenol imineligand compound and alkyl lithium, reacting with a zirconium halide compound in an organic medium according to the molar ratio being 1:(1.0 to 1.5), controlling the reaction temperature to be -78 to110 DEG C, reacting for 2 to 96 hours, filtering, concentrating, and recrystallizing to obtain the bisphenol oxygen-imine ligand zirconium compound; the bisphenol oxygen-imine ligand zirconium compound is applied to olefin homopolymerization and copolymerization in the presence of alkylaluminoxane. Compared with the prior art, according to the bisphenol oxygen-imine ligand zirconium compound, as well as the preparation method and the application thereof provided by the invention, the raw materials are easy to get, a synthetic route is simple, the product yield is high, the bisphenol oxygen-imine ligand zirconium compound has a stable property and higher catalytic activity at the same time, polyethylene, polypropylene, a copolymer of ethylene and propylene, a copolymer of ethylene and 1-hexene, and a copolymer of ethylene and 1-octylene with high molecular weight and narrow molecular weight distribution can be obtained, and the demands of an industrial department can be met.

The invention relates to a lithium compound and application thereof in the field of organic synthesis, in particular to application of a lithium complex in a hydroboration reaction of nitrile. Compared with the research of the beta-diimine anion ligand on organometallic chemistry, the application research of the beta-ketimine anion ligand is less, and the compound (complex) of the double-anion beta-ketimine ligand and the application thereof and the hydroboration reaction are not reported so far. The compound is applied to the hydroboration reaction of nitrile, and efficient reduction of nitrile and pinacol borane can be achieved.