280 results about "Palladium compound" patented technology

Described herein are platinum and palladium compounds with geometrically distorted charge transfer state, applications and methods for the preparation thereof. The platinum and/or palladium compounds described herein are capable of emitting light and can be used in light emitting devices.

A carbon-insertion-type palladium metal in which an amount of inserted carbon is 0.16 mol or more with respect to 1.0 mol of a palladium metal, and a carbon-insertion-type palladium metal in which a crystal face distance of a (111) face of a palladium metal is 2.270 Å or more are useful as raw materials of a palladium catalyst for use in an α,β-unsaturated carboxylic acid preparation reaction, and the like. The carbon-insertion-type palladium metal can preferably be prepared by reduction of palladium in a palladium compound having a chlorine content of 0 to 300 ppm.

The invention discloses a hydrogenation catalyst, characterized in that: active components are loaded on a carrier, the active components comprise 0.2-5 wt% of metallic palladium and 0.1-2.5 wt% of rare earth oxide. The catalyst is prepared by the following steps: preparing water-soluble palladium-containing compound, water-soluble rare earth compound and water into a palladium-rare earth aqueous solution, dipping a carrier in the palladium-rare earth aqueous solution to loading the palladium-containing compound and rare earth compound on the carrier to obtain a catalyst precursor; drying and roasting the catalyst precursor, then carrying out reduction processing at a temperature of 50-200 DEG C in the presence of hydrogen to reduce oxidative divalent palladium in the palladium compound to metallic palladium.

The present invention provides a method for producing a cyclic olefin addition copolymer wherein a monomer composition containing 5 to 80 mol % of a cyclic olefin having a substituent selected from alkyl groups, alkylsilyl group, and alkylsilylmethyl group represented by formula (1) below and 20 to 95 mol % of a cyclic olefin represented by formula (2) below is addition-copolymerized in the presence of a palladium-based multicomponent catalyst containing a specific palladium compound (i), a specific phosphorus compound (ii), and an ionic boron compound or an ionic aluminum compound (iii):

(one of A¹ to A⁴ is a C_4-5 alkyl group, trimethylsilyl group, or trimethylsilylmethyl group, and the others each independently are a hydrogen atom, halogen atom, or methyl group)

(B¹ to B⁴ are each independently a hydrogen atom, methyl group, or halogen atom.)

The invention provides a method for preparing beta-carotene. The method comprises the steps of subjecting a vitamin A derivative and triphenylphosphine to a reaction so as to obtain an organic phosphonium salt, and carrying out a coupling reaction in the presence of a palladium compound catalyst and a weak base compound by taking a cyclodextrin compound as a phase transfer catalyst and adopting molecular oxygen as an oxidant, thereby obtaining the beta-carotene. The reaction employs a series method to prepare beta-carotene and is high in reaction selectivity and yield, and the process is simple, so that the method facilitates industrial production.

A method of forming a supported oxidation catalyst includes providing a support comprising a metal oxide or a metal salt, and depositing first palladium compound particles and second precious metal group (PMG) metal particles on the support while in a liquid phase including at least one solvent to form mixed metal comprising particles on the support. The PMG metal is not palladium. The mixed metal particles on the support are separated from the liquid phase to provide the supported oxidation catalyst.

The invention discloses a method for reducing alkyne into cis-form olefin. The method comprises the following steps: in inert atmosphere, putting potassium hydroxide, a catalyst and alkyne in an organic solvent, and conducting reduction reaction on alkyne, and obtaining the cis-form alefin after the reaction. In the method, the catalyst is selected from at least one of Pd (OAc)2, PdCl2, Pd/C and Pdcl2 (PPh3). The organic solvent is N, N-dimethyl fomamide and/or at least one mixture in the following solvents: toluene, dioxane, dimethyl sulfoxide and water, and N,N-dimethyl fomamide is selectedpreferably. The alkyne is aliphatic alkyne or aromatic alkyne. The method adopts cheap and safe potassium hydroxide and DMF as the precursor of hydrogen, the catalyst is simple palladium compound which is cheap and easy to obtain, and the catalyst system shows the alkyne can be reduced into the cis-form olefin, with high efficiency and selectivity.

The invention discloses a preparation method of a palladium carbon catalyst for hydrorefining of terephthalic acid. The method is characterized by employing the following steps of: exposing pretreated particles or molding activated carbon to light hydrocarbon solvent of titanium-containing compounds; filtering and purging with nitrogen gas; drying and impregnating the mixture into a solution of palladium-containing compound; reducing and washing the mixture to neutral, so as to obtain the palladium carbon catalyst. Compared with the prior art, the invention is characterized in that, first, grafted titanium dioxide and its cluster are firmly connected with activated carbon carrier, thereby effectively eliminating a strong reduction center on the activated carbon surface; second, the palladium carbon catalyst has high microcrystal content of metal palladium, good dispersion and high activity of catalyst. and third, the preparation method of the catalyst is simple.

A process for manufacturing a cycloolefin addition polymer includes polymerizing monomers containing a cycloolefin compound using a catalyst containing a nickel compound or a palladium compound by addition polymerization in the presence of a molecular weight controlling agent in two steps, that is a step of a initiating the polymerization reaction using the monomers in an amount of not more than 80 wt % of the total monomers and a step of supplying the remaining monomers to the reaction system during the polymerization reaction. A cycloolefin addition polymer with a uniform quality, having a narrow molecular weight distribution and a controlled molecular weight, and excellently balanced processability and mechanical strength can be obtained at a high polymerization conversion rate using the process. The process can be operated at a highly controlled polymerization temperature, and is thus suitable for industrially manufacturing a cycloolefin addition polymer.

The invention relates to a method for reducing aromatic nitro to arylamine. The method comprises the following steps: (1) taking an aromatic nitro compound as a raw material, water as a hydrogen source, a palladium compound, cheap and easy to obtain, as a catalyst and tetrahydroxydiboron as an additive to reduce nitro to obtain a product; (2) taking the aromatic nitro compound as the raw material, a copper salt, cheap and easy to obtain, as the catalyst, the tetrahydroxydiboron as the additive to reduce the nitro to obtain a product; and (3) taking the aromatic nitro compound as the raw material, water as the hydrogen source, and the tetrahydroxydiboron as the additive, without needing a metal catalyst, to reduce the nitro to obtain a product. A preparation method for the arylamine, which is provided by the invention, is mild in reaction condition, low in costs, environment-friendly, high in yield, and suitable for industrial production.

The invention relates to a platinum and palladium containing bimetallic catalyst, a preparation method therefor and an application of the platinum and palladium containing bimetallic catalyst. The preparation method for the catalyst comprises the following steps: (1) impregnating a carrier with a solution containing a palladium compound, and then, subjecting the impregnated carrier to baking, roasting and reduction sequentially, so as to obtain a palladic monometallic catalyst precursor; and (2) impregnating the palladic monometallic catalyst precursor obtained in the step (1) with a solution containing a platinum compound in a reducing atmosphere, and then, carrying out drying so as to remove the solvent. Compared with catalysts which are prepared in the prior art and have the same noble-metal content, the catalyst provided by the invention has better aromatic-hydrocarbon saturation activity.

The invention relates to a vinyl acetate catalyst, and aims to solve the problem that a current vinyl acetate catalyst has low activity and selectivity. According to the preparing method, the vinyl acetate catalyst is adopted, SiO2, Al2O3 or the mixture of the SiO2 and the Al2O3 is used as a carrier, and a loading activity component comprises metal palladium, metal gold, alkali metal acetate and at least one kind of dendritic macromolecular compound in compound 1 and compound 2 specified in the following formula, wherein the catalyst comprises 1-12g/L of palladium, 0.1-10g/L of gold, 10-100g/L of alkali metal acetate and 0.1-2.0 g/L of dendritic macromolecular compound and E t1-E t 16 are independently chosen from a technical scheme of C1-C3 alkyl group. During the preparing process of the vinyl acetate catalyst, the dendritic macromolecular compound is added after dipping palladium compound and gold compound and before a reduction step during the preparing of the catalyst.

The invention relates to a polyether-loaded N-heterocyclic carbene-palladium compound and a preparation method and application thereof, belonging to the field of organic synthesis. For the polyether-loaded N-heterocyclic carbene-palladium compound, polyether molecular chains contain chain links (I): n in the chain links (I) is equal to 1-10, R is aryl or alkyl, and X is Cl-, Br-, I-, BF4- or PF6-. Compared with polyvinyl benzene, the polyether compound has good main chain flexibility and adjustable branched chain length, and can be used for loading a catalyst to enable the catalyst to maintain higher catalytic activity and enable polymers containing polyepichlorohydin chain links, N-hydroxyl-substituted imidazolium, alkali and palladium salts to react to prepare the compound. The invention also provides the application of the compound: the compound is used for catalyzing substituting reaction of aromatic compounds Aryl-X' and alpha-H contained carboxylic ester to synthesize alpha-aryl carboxylic ester by one-step catalysis, and has mild reaction condition, high yield, good economic benefit and important application value.

The invention discloses application of a metallide/palladium compound catalytic reduction system in reaction of removing allyl groups of a compound containing the allyl groups and deuteration reaction. The reaction comprises the following steps: under protection of nitrogen gas, suspending a palladium compound and a metallide in a solvent, stirring for 5 minutes, adding the compound containing theallyl groups, reacting for 0.5-36 hours at the temperature of minus 50-120 DEG C, adding ice water to stop reaction, regulating a pH value to 3.5 by using diluted hydrochloric acid, and carrying outsolvent extraction, drying by steaming and column-chromatography purification on reaction liquid to finish the reaction.

The invention relates to an organic compound synthetic method and provides a method for preparing a benzfluorenone compound by palladium as a catalyst. The method solves the problem that the existing benzfluorenone compound synthesis method utilizes difficultly prepared raw materials and has a high reaction temperature, a lot of reaction processes, a low yield and long reaction time. The method comprises that o-alkynylchalcone as a raw material and a fluoride reagent as an oxidizing agent undergo a reaction in the presence of a palladium compound as a catalyst to produce the benzfluorenone compound shown in the structural formula (II). The method utilizes a base metal to replace an expensive precious metal and realizes a reaction under mild conditions. The reaction formula is shown in the following description.

The invention discloses a catalyst containing palladium compound, a preparation method and an application thereof. According to a compounding method of the palladium compound PdBr2(PPh3)2, o-chloro pyridine is taken as an initial raw material, reacts with methyl iodide and then reacts with tetra (triphenylphosphine) palladium. According to the compounding method of the palladium compound PdI2(PPh3)2, o-bromopyridine is taken as the initial raw material, reacts with iodoacetic acid and then reacts with tetra (triphenylphosphine) palladium. The method for compounding the target product provided by the invention is simple, easy to operate and control and also has the advantages of high product purity and high yield. Such a compound can be applied to the Heck coupling reaction of aryl halogen and ethyl acrylate and has ultrahigh catalytic activity.