30 results about "Palladium(II) acetate" patented technology

A continuous process is provided for selective formation of a vinyl ester by reactive distillation from a corresponding carboxylic acid. Carboxylic acid, vinyl acetate, and a palladium acetate—bidentate ligand catalyst complex are provided and reacted in a typical embodiment. Acetic acid and vinyl acetate are continuously removed from the reaction mixture and vinyl acetate is recycled to the reaction mixture. The vinyl ester product is separated from the vinyl acetate, residual carboxylic acid, residual acetic acid, and catalyst.

The present invention relates to a process for preparing polyketone with improved catalytic activity and intrinsic viscosity, and specifically a process for preparing polyketone wherein an organometallic complex comprising acetate-palladium and 1,3-bis[bis(2-methoxy-5-methylphenyl)phosphino]propane is used as a catalyst component, and a mixed solvent of 70 to 90 vol% of acetic acid and 10 to 30 vol% of water is used as a liquid medium.

The invention belongs to the technical field of fine chemical industry. A heterogeneous catalyst technology is adopted, a complex catalyst is of a chelate structure and is formed by diphosphine ligandand transition metal compounds, the complex catalyst is used for catalyzing heterogeneous rearrangement of 3-methyl-3-butene-1-alcohol, production of by-products such as isoamyl alcohol and isopreneare inhibited at the same time, the conversion rate of raw materials is increased, and the product selectivity is improved. The invention provides a preparation method of the catalyst. The invention relates to a preparation method of allylic alcohol. Preparation is carried out by adopting a 3-methyl-3-butene-1-alcohol heterogeneous rearrangement technology. The preparation method is characterizedin that heterogeneous rearrangement is completed with the 1,3-bi(diphenylphosphine)propane-palladium-acetate chelate complex as the catalyst and on the conditions that hydrogen exists, the temperatureranges from 50 DEG C to 80 DEG C, and the time ranges from 20 minutes to 2 hours. According to the preparation method, the raw materials are easy to get, the cost is low, the repeated usage time number of catalysts is large, no three wastes are produced, and the energy consumption is low; and because of energy saving, consumption reduction and environmental protection, and the high conversion rate of the raw materials and the high product selectivity, the preparation method is suitable for preparing allylic alcohol and is especially suitable for preparing high-quality allylic alcohol.

A method for preparing a sensitizing material and an organic light emitting diode are provided, the method including: adding C24H16Br2P2 and dichloromethane to a hydrogen peroxide solution to react therewith, dissolving a reactant in a dichloromethane solution and subjecting the solution to a purification with a first silica gel column; adding a purified product, a predetermined electron donor material, palladium acetate, and tri-tert-butylphosphine tetrafluoroborate in sodium tert-butoxide and toluene to react; extracting with dichloromethane and purified by a second silica gel column.

The invention discloses an activated carbon-supported nitrile group ionic liquid-palladium (Pd) catalyst for synthesizing polyketone and a preparation method thereof, wherein the homogeneous membrane of palladium acetate and N-valeronitrile-N'-methylimidazolium hexafluorophosphate ionic liquid are supported on pretreated activated carbon. The preparation method comprises the following steps: dissolving palladium acetate and N-valeronitrile-N'-methylimidazolium hexafluorophosphate ionic liquid in solvent acetone to stir, then adding pretreated activated carbon in the solution, continuously stirring, distilling, and drying to obtain the activated carbon-supported nitrile group ionic liquid-Pd catalyst. The invention has the advantages that polar group nitrile groups can increase the bindingforce between ionic liquid and activated carbon, the nitrile group ionic liquid membrane coating activated carbon can increase the dispersivity of Pd<2+>, reduce the loss of Pd<2+>, prevent the product polyketone from blocking the pores of activated carbon, prevent Pd<2+> from being embedded and increase the reactivity of the copolymerization of carbon monoxide and styrene for preparing polyketone.

The invention relates to a catalyst for synthesizing dimethyl oxalate through CO gas phase coupling and a preparation method thereof. Alumina is first modified with additives to prepare modified α-Al2O3, and then impregnated with palladium acetate / acetone solution that has been treated with ultrasonic waves and light irradiation to prepare a catalyst with modified α-Al2O3 as the carrier and noble metal Pd as the active component. The Pd / α-Al2O3 catalyst prepared by modifying the α-Al2O3 carrier in the present invention not only has a low palladium load, but also can improve the utilization rate of methyl nitrite, efficiently synthesize dimethyl oxalate and the like.

The present invention relates to a process for the preparation of a compound of formula (I) said process comprising the steps of: a) reacting a compound of formula (II), with an acylating or a silylating agent to produce a compound of formula (III), wherein P1 and P2 are each independently a protecting group selected from R2—Si—R3R4, or R1CO—, wherein R1 is a group selected from C1-6alkyl or C3-6cycloalkyl, each group being optionally substituted by one or more substituents independently selected from fluoro or C1-4alkyl; R2, R3 and R4 are each independently a group selected from C1-6alkyl or phenyl, each group being optionally substituted by one or more substituents independently selected from fluoro or C1-4alkyl; b) reacting the compound of formula (III) in the presence of palladium acetate or a derivative thereof to produce compound of formula (IV); and c) reacting the compound of formula (IV) with a reducing agent to produce compound of formula (I).

The invention relates to a preparation method of idebenone. The method comprises the following steps: adding an oxidant hydrogen peroxide to coenzyme Q0 and 11-hydroxyundecanoic acid used as raw materials and copper chloride, copper sulfate, copper acetate, silver carbonate, silver oxide, palladium chloride or palladium acetate used as a catalyst under the protection of oxygen, and carrying out a free radical alkylation reaction; and carrying out extraction, water washing, drying, reduced pressure distillation and column chromatography on the obtained reaction system to obtain a yellow needle-like crystal 6-(10-hydroxydecyl)-2,3-dimethoxy-5-methyl-1,4-benzoquinone, that is idebenone. The preparation method has the advantages of simplicity in operation, low cost and high yield, and is suitable for the large-scale industrial production of idebenone.

The invention discloses a catalyst for preparing polyketone via copolymerization of carbon monoxide and styrene, belonging to the preparation technique of polyketone; wherein, the catalyst comprises palladium acetate, benzoquinone and p-toluene sulfonic acid, sulfamic acid, fluoboric acid or the mixture with Pka less than three; and 4, 4'-dimethyl-2, 2'-bipyridine and rare earth salt of praseodymium phosphate, neodymium phosphate, europium phosphate, dysprosium phosphate, holmium phosphate or the mixture with different proportions are adopted as the ligand of the catalyst. The catalyst for preparing polyketone via copolymerization of carbon monoxide and styrene has the advantages that catalytic activity of the catalyst is improved by one to three times when the 4, 4'-dimethyl-2, 2'-bipyridine and a certain amount of rare earth phosphate salts are added under the condition of the same amount of palladium acetate as the main catalyst; and catalyst cost is effectively reduced.

The invention relates to a catalyst used for synthesizing polyketone by copolymerization of carbon monoxide and cinnamene and a method for synthesizing the same. The catalyst comprises palladium acetate, para-benzoquinone, paratoluenesulfonic acid, fluoboric acid or a mixture of the palladium acetate, the para-benzoquinone, the paratoluenesulfonic acid and the fluoboric acid and 4, 4'-dicarboxylic acid carbethoxyl group-2,2'- dipyridyl. In the invention, carbon monoxide and cinnamene are taken as materials, and absolute methanol is taken as a solvent, and under the conditions of a temperatureof between 20 and 80 DEG C and a pressure of between 0.1 and 10Mpa and in the presence of the catalyst, the materials undergo the polymerization reaction for 1 to 3 hours. The catalyst provided by the invention has the advantages of good activity, high yield of the polyketone and high relative molecular mass of the synthesized polyketone; under the condition of the same use level of the main catalyst palladium acetate, the addition of the 4, 4'-dicarboxylic acid carbethoxyl group-2, 2'- dipyridyl can not only improve the activity of the catalyst by 1 to 3 times, but also improve the relative molecular mass of the polyketone by 1 to 2 times.

The present invention relates to a process for the preparation of di- or tricarboxylic acid esters by alkoxycarbonylation of dienes having conjugated double bonds. In particular, the invention relates to a process comprising the following process steps: a) prefeeding a diene with two conjugated double bonds; b) adding a phosphine ligand and a catalyst precursor selected from the group consisting of palladium dichloride, Palladium dibromide, palladium diiodide, palladium(II) acetylacetonate, palladium(II) acetate, bis(dibenzylideneacetone)palladium, bis(acetonitrile)palladium(II) dichloride, (cinnamyl) dichloride palladium chloride; c) addition of alcohol; d) input of CO; e) heating of the reaction mixture wherein the diene is converted to di- or tricarboxylate.

The present invention relates to new compound diethyl 4-(4-oxobutyl) benzoyl-L-glutamate and its preparation process and application. The compound diethyl 4-(4-oxobutyl) benzoyl-L-glutamate in the chemical expression as shown is prepared through the reaction of compound diethyl 4-bromo benzoyl-L-glutamate and 3-butene-1-alcohol inside N,N-dimethyl formamide solvent under the action of palladium acetate catalyst, weak alkali reagent, lithium halide and phase transfer catalyst in the protection of inert gas at 50-70 deg.c. The compound diethyl 4-(4-oxobutyl) benzoyl-L-glutamate is used in synthesizing diethyl 4-[(4-oxo-3-bromo) butyl] benzoyl-L-glutamate as the intermediate of Pemetrexed disodium. The present invention results in shortened Pemetrexed disodium synthesizing path and lowered production cost.

The invention provides a nano core-shell combustion catalyst and a preparation method thereof. The preparation method comprises the following steps: taking cis-5-norbornene-exo-2, 3-dicarboxylic anhydride, hexanediol, p-toluenesulfonic acid and dichloromethane to prepare a dibromide monomer sample; taking pure triamine, cis-5-norbornene-exo-2, 3-dicarboxylic anhydride and a toluene solvent to prepare a cross-linking agent; and taking a dibromide monomer, a catalyst, copper sulfate or palladium acetate to prepare a nano core-shell combustion catalyst. The method has the advantages and positive effects that: the two problems of agglomeration of metal active molecules and incapability of accurately controlling the shell thickness are solved. A dibromide monomer with an active center at the tail end is synthesized through a ring-opening metathesis polymerization reaction, then a cross-linking agent is added for further cross-linking so as to form a combustion catalyst with a compact shell structure composed of linear macromolecular arms and a core containing a ligand structure, the particle size of the combustion catalyst is in the nanometer size, the activity is high, the catalytic combustion efficiency is high, and the preparation method is beneficial to large-scale production.

The present application relates to the technical field of catalysts, in particular to a palladium-copper catalyst and its preparation method and application. The preparation method of the palladium-copper catalyst comprises the following steps: preparing palladium nanoparticles: dissolving palladium acetate in absolute ethanol, and performing constant temperature treatment at 0-20° C. for 24-48 hours to obtain an absolute ethanol solution containing palladium nanoparticles; Preparation of palladium-modified copper-based metal-organic framework: dissolving trimesic acid in the absolute ethanol solution containing palladium nanoparticles, adding copper nitrate aqueous solution, mixing evenly, and performing solvothermal reaction to obtain palladium-modified copper-based metal Organic framework; calcining: calcining the palladium-modified copper-based metal-organic framework in an inert gas atmosphere to obtain the palladium-copper catalyst supported by porous carbon. The preparation method can obtain a palladium-copper catalyst with good catalytic activity to furfural, and the preparation method has simple steps, does not need additional reducing agents, and has good industrial application prospects.