42 results about "Acetylpyruvic acid" patented technology

The invention provides a method for preparing penicillanic acid sulfoxide diphenyl methyl ester. Penicillanic acid sulfoxide is prepared by the following four-step reaction. Hydrobromic acid is used as a brominating agent for substituting potassium bromide and bromine, and hydrogen peroxide is used as an oxidant for substituting peracetic acid and chloroperoxybenzoic acid, so the preparation method is safe and environment-friendly; in addition, the hydrogen peroxide is reacted with a compound (iii) under the catalysis action of acetyl molybdenum pyruvate so that the reaction mole yield can be obviously improved and reaches 90 percent; zinc powder which substitutes palladium and carbon is used as a reducing agent, so high-pressure equipment is not needed in the reaction; and the preparation method simplifies the process operation step, is easy for industrialized production, and reduces the production cost.

The invention discloses a preparation method of a Cu2ZnSnSxSe4-x nanocrystal with low cost and high quality, which comprises the steps of: adding reactant precursors of oleylamine, cupric acetylacetonate, zinc acetate, tin tetrachloride, sulfur powder and selenium powder into a reaction flask, then heating the reactant precursors for reacting to obtain the Cu2ZnSnSxSe4-x nanocrystal with high quality. The invention has the advantages that the preparation method of the nanocrystal is simple, the materials of the precursors have low cost and no toxicity, and the prepared nanocrystal particles have better dispersivity and crystallinity and the like. The nanocrystal prepared by the invention can be used as an absorption layer of a photovoltaic device.

The invention discloses a preparation method of low-cost and high-quality Cu2CdSnSe4 nano crystals. The method comprises the following steps of: adding oleamide, acetylacetone acid copper, cadmium acetate, tin acetate and selenium powder which are reactant precursors into a reaction flask; then raising the temperature for reacting; and finally obtaining the high-quality Cu2CdSnSe4 nano crystals. The invention has the advantages that the preparation method of the nano crystals is simple; the used precursor materials have low cost; and the prepared nano crystal granules have better dispersity and crystallinity, and the like. The nano crystals prepared by using the method can be used as materials of thermoelectric devices.

The invention discloses a linear Cu-Ni alloy nanocrystal and a synthesis method thereof. The nanocrystal is linear and has a face-centered cubic structure. According to the synthesis method, polyvinylpyrrolidone (PVP) is used as a coating agent, aniline is used as a reducing agent, and PVP, aniline, copper acetylacetonate and nickel acetylacetonate are dissolved in benzyl alcohol, and a solvothermal process is carried out so as to prepare the nanocrystal. Results show that nanoparticles can directionally form a linear nanostructure through addition of a proper amount of PVP and a small amountof aniline; certain special exposed crystal faces and a large amount of twinning dislocations exist and can provide more active sites for the nanocrystal; and when used as a catalyst, the nanocrystalcan effectively treat exhaust gas and realize degradation of organic matters in waste water. The success of the preparation method for the nanocrystal is of certain theoretical and practical significance to morphology-controllable synthesis of nanocrystals, controllable synthesis of transition-metal and double-metal nanocrystals and application of the catalysis performance of nanocrystals with special morphology.

The invention belongs to the field of catalysts, and in particular relates to a palladium-free, amine-free and ligand-free copper catalyst system. The catalyst system can catalyze a Sonogashira reaction to prepare alkyne compounds. The catalyst system comprises cupric salt, potassium carbonate and a solvent dimethyl sulfoxide, wherein the molar ratio of the cupric salt to the potassium carbonate is 1:20-40; and the cupric salt is one or the mixture of more than one of copper acetate, copper acetylacetonate, copper trifluoromethanesulfonate and copper sulfate. In the catalyst system, noble metal is replaced by the stable cupric salt, so that the catalyst system is economic, cheap and non-toxic; for a substrate with poor activity, the catalyst system is added with TBAB to promote the reaction remarkably; and the catalyst system is suitable for large-scale application and industrialized production.

Dental material which contains an antimicrobial active ingredient according to general formula (I),

in which R¹=H, C₁ to C₃ alkylene residue; R²=a linear or branched C₄ to C₂₀ alkylene residue; R³=a C₆ to C₂₀ alkylene residue; and A⁻=Cl⁻, Br⁻, I⁻, F⁻, OH⁻, alkyl and aryl alcoholate, thiolate, NO₃⁻, BO₃³⁻, PO₄³⁻, HPO₄²⁻, H₂PO₄⁻, alkyl and aryl phosphate, alkyl and aryl phosphonate, PF₆⁻, TiF₆²⁻, BF₄⁻, acetylacetonate, β-diketonate or anion of a β-keto ester. The dental material is suitable in particular as tooth filling material, material for inlays or onlays, tooth cement, enamel/dentine adhesive, veneering material for crowns and bridges, or as material for false teeth.

The invention relates to a preparation method of a Pt-Cu linear nano-catalyst. The method comprises the following steps of adding acetyl acetone platinum and potassium iodide into oleylamine, then adding copper acetylacetonate, reacting for 3 to 24 hours at the temperature of 160 to 180 DEG C; finally washing through absolute ethyl alcohol to obtain the Pt-Cu linear nano-catalyst. The method for preparing the Pt-Cu linear nano-catalyst, provided by the invention, is simple and convenient without using a template, simple to operate, and easy for production.

This invention comprises a process for hydrogenation of aldehydes to alcohols using novel homogeneous catalysts. The catalysts are generated in situ under hydrogen and carbon monoxide gases in a suitable solvent, by mixing a rhodium catalyst precursor, such as Rh(CO)₂ acetoacetonate and a defined ligand.

The invention discloses one-component silane-modified polyether sealant for ALC (autoclaved lightweight concrete) plates, made from, by mass, 100 parts of silane-modified polyether resin, 90 to 150 parts of a plasticizer, 100 to 300 parts of a filler, 0 to 25 parts of a pigment, 0 to 20 parts of a thixotropic agent, 0.5 to 5 parts of an ultra-violet absorbent, 0.5 to 5 parts of a light stabilizer,0.5 to 5 parts of a water remover, 2 to 3 parts of a first adhesion promoter, 0.5 to 1 part of a second adhesion promoter, and 0.05 to 2 parts of a catalyst. Silane-modified polyether resin of whichthe number-average molecular weight is 16000 to 28000 g/mol and which is of linear structure is chosen to serve with the reaction product of dibutyltin bis(2,4-pentanedionate) and/or tetraethyl orthosilicate and dibutyltin bis(acetoxy) in cooperation with the first adhesion promoter, the second adhesion promoter and other components to prepare the one-component silane-modified polyether sealant for ALC plates. The one-component silane-modified polyether sealant for ALC plates has the advantages of ultra-low modulus, high extension rate, rapid solidification, good adhesion with ALC plates, good security and greenness, good stability and outstanding painting property.

The invention relates to a method for synthesizing a water phase of Mn<2+> doped CdS fluorescent quantum dots by stable acetopyruvic acid. The method comprises the following steps: (1), adding acetopyruvic acid into redistilled water and heating to the temperature of 80 DEG C with magnetically stirring to sufficiently dissolve the acetopyruvic acid so as to form homogeneous solution; (2), adding inorganic cadmium salt and thiocarbamide into aqueous solution of the acetopyruvic acid to form homogeneous reaction solution; (3), adding aqueous solution of the inorganic cadmium into the reaction solution and performing the reflux reaction on the mixed solution for hours; and (4), cooling to the room temperature, carrying out high speed centrifugation, washing precipitates with water and then dispersing the precipitates in water by ultrasound to prepare aqueous solution of the Mn<2+> doped CdS fluorescent quantum dots. Compared with the prior art, the method disclosed by the invention is simple, rapid and convenient to operate and is low in cost; and the prepared product has a fluorescent property capable of being reversibly regulated by redox reaction and can be developed into a potential fluorescence indicator, is used for biochemical analysis, living imaging of cells and tissues and fluorescent detection of redox reaction and provides a novel development direction for research in the fields of biological detection, chemical analysis and the like.

The invention discloses a copper salt catalyzing system. The copper salt catalyzing system is used for catalyzing esterification reaction to prepare a methyl benzoate compound. The copper salt catalyzing system is composed of a copper salt, an oxidant and an alkali, wherein the mol ratio of the copper salt to the oxidant is 1: 15 to 40; the copper salt is selected from one or a mixture of more than one of 8-hydroxyquinoline copper, cupric acetate monohydrate, copper acetylacetonate, cuprous bromide, anhydrous cupric sulfate, copper fluoride dihydrate and pure copper; and the oxidant is one of tert-butyl hydroperoxide, di-tert-butyl oxide or dicumyl peroxide. The newly developed copper salt catalyzing system for benzyl alcohol esterification reaction greatly reduces the reaction cost, the raw materials are simple and easy to gain, the system is in a wide applicable scope of substrates, the yield is up to 99%, the reaction is carried out in the air atmosphere, the operation is simple, and the chemoselectivity is high; and the copper salt catalyzing system is environmentally friendly, has no three-waste discharge, meets green chemistry requirements, and is also beneficial for industrial application.

The invention discloses a novel lubricating oil which comprises the following components in parts by weight: 50-70 parts of rose oil, 60-70 parts of grape seed oil, 10-15 parts of ethyl acetopyruvate, 8-12 parts of 2-oxocyclopentanecarboxylate, 7-10 parts of guaiazulene, 9-13 parts of sebacic acid, 6-10 parts of cinnamic acid, 5-9 parts of 4-fluoroacetanilide, 4-8 parts of dichorodimethyl pyridol, 8-15 parts of dilinoleic phosphite ester, 12-16 parts of vanillyl butyl ether, 3-7 parts of 2,3,4-trihydroxybenzophenone and 9-13 parts of difenidol hydrochloride. Various chemical reagents are added into the vegetable oil, so that the permeability of the lubricating oil is increased and the lubricating oil can adapt to different environments under low temperature and high temperature.

The present invention provides a method for preparing an antiulcer agent, 2-(2-pyridylmethylsulphinyl)benzimidazoles, such as Omeprazole, Lansoprazole and Pantoprazole, which includes oxidizing an intermediate having a linkage of methylthio group (—CH₂S—) to methylsulfinyl (—CH₂S(O)—) in the presence of an oxidation catalyst of acetyl acetonate of molybdenium (II) [(CH₃C(O)CH₂C(O)CH₂)₂Mo].

The invention relates to the technical field of attractants, in particular to a termite attractant which comprises ethyl acetylacetonate. The attractant provided by the invention is derived from biological control fungus metabolites. The monomer pure compound adopted by the invention is stable in property, environment-friendly and good in termite attraction effect, and plays a key role in killing termites.

The invention relates to polyvinyl chloride cable materials, and particularly relates to an environmentally-friendly 90-DEG C polyvinyl chloride cable insulating material. The environmentally-friendly 90-DEG C polyvinyl chloride cable insulating material is prepared from raw materials such as 2-phenyl-2, 3-diazaspiro [4. 5] decane-1, 4-diketone, 2-(phosphonooxy)acrylic acid-cyclohexanamine (1:1), 1, 3-ketoamine, 1-acetyl-2- imidazolone and ethyl acetopyruvate. The environmentally-friendly 90-DEG C polyvinyl chloride cable insulating material does not contain heavy metals such as lead, cadmium, chromium and mercury greatly damaging peoples and environments and other prohibited substances; the performances of the environmentally-friendly 90-DEG C polyvinyl chloride cable insulating material completely satisfy the requirements of standards on the environmentally-friendly 90-DEG C polyvinyl chloride cable insulating material; and the environmentally-friendly 90-DEG C polyvinyl chloride cable insulating material is suitable for wide popularization and application in polyvinyl chloride cable insulating materials.

The invention discloses a making method of 2-alkoxy-4-oxo-peta-2-alkylene acid ester compound in the organic chemical technical domain, which is characterized by the following: shortening reacting time; improving receiving rate; avoiding three-slag pollution; condensing acetylacetonate and orthoformate in the aliphatic alcohol catalyzed by acid to obtain the product.

Disclosed is a method for providing an anti-corrosion protective coating to a metal substrate that uses a coating composition comprising a resin and a polyfunctional bridging molecule to both bind to the resin and to chelate the bound polymeric resin directly to the metal substrate. One category of polyfunctional bridging molecules preferably includes at least one amine function to bind to a resin and at least one carboxylate, thiol, silane, phenolate, acetoacetonate, imine, phosphate, or phosphonate function to chelate to a metal substrate. It is theorized that the amine function can bind to certain pendent chains in coating resins through a Michael addition reaction while the carboxylate, thiol, silane, phenolate, acetoacetonate, imine, phosphate, or phosphonate functions chelate to the metal substrate. These polyfunctional bridging molecules provide an organic binding of the resin to the metal substrates.