63results about How to "Catalytic conditions are mild" patented technology

The invention discloses a method for photocatalytic synthesis of sulfur sulfone compounds, and belongs to the technical field of catalysis. The invention provides a novel green environmentally-friendly method to efficiently synthesize the sulfur sulfone derivatives, and one thioether compound and an oxidizing agent are subjected to direct oxidization to form one corresponding sulfur sulfone compound under illumination by utilizing cercosporin as a catalyst. The method provided by the invention adopts the cercosporin as the catalyst, the catalytic conditions are milder, the reaction can be performed at room temperature under visible light irradiation, the catalyst has high catalytic activity and can be used for high-selectivity catalytic synthesis of the sulfur sulfone compounds, and the micro catalyst can make a yield higher, wherein the yield can reach 90% or more; and the photocatalyst and substrate raw materials used in the method are simple and easy to obtain, have low costs and can be produced on a large scale, and the method has very good application prospects.

The invention discloses a preparation method of a lithium-loaded silica gel catalyst. The lithium-loaded silica gel catalyst is prepared from silicic acid hydrosol and lithium chloride powder in a gelling manner. According to the preparation method of the lithium-loaded silica gel catalyst, lithium with catalytic action is dispersed and fixed to a silica gel carrier. Compared with the prior art, the method disclosed by the invention has the advantages that the catalytic efficiency is higher, the required catalytic conditions are milder, and the industrial production is facilitated.

The invention discloses an olefin isomerization catalyst and an application thereof. The catalyst is an organic liquid of transition metal salt and Lewis acid, the molar ratio of which is ranged from 1: 0.5 to 1: 10. The concentration of the transition metal salt is ranged from 1 mmol / L to 10 mmol / L. The catalyst disclosed by the invention is used for liquid phase catalysis of olefin isomerization and is mild in reaction condition, relatively high in yield, easy to implement and low in cost.

The invention discloses a preparation method of an aromatic thioether compound, belonging to the technical field of catalysis. The invention provides a novel environment-friendly method for efficiently synthesizing a thioether derivative; and under the action of a catalyst, thiophenol and an aryl diazonium salt compound are directly coupled under illumination to generate the aromatic thioether compound, wherein the catalyst is cephalosporin. According to the method disclosed by the invention, the cephalosporin is used as the catalyst; catalytic conditions are mild, and the method can be carried out at room temperature under visible light irradiation; the catalytic activity of the catalyst is high, and the thioether compound can be catalytically synthesized with high selectivity; and the yield of the thioether compound can reach 96% or above by virtue of a trace amount of the catalyst. The photocatalyst disclosed by the invention has the advantages of usage of simple and easily available substrate raw materials, environmental friendliness, low cost and very good application prospect, and can be produced on a large scale.

The invention discloses a preparation method of an amino-acid ester or deuterated amino-acid ester compound, which comprises the following steps of: adding a photosensitizer and an organic solvent into a reaction container by taking imidic ester, silane and water or heavy water as initial raw materials, carrying out stirring reaction under the irradiation of blue light, detecting that the reaction raw material imidic ester completely disappears by TLC thin-layer chromatography, and filtering to obtain the deuterated amino-acid ester compound. And stopping stirring, removing the volatile solvent, carrying out silica gel column chromatography or neutral alumina column chromatography, and carrying out vacuum concentration to obtain the target amino-acid ester or deuterated amino-acid ester compound. According to the method, blue light catalysis is used for replacing traditional precious metal catalysis, silane and water are used for replacing a traditional hydrogen source for the first time, transfer hydrogenation of the imidic ester compounds is achieved, cheap deuterium water is used as a deuterium source, a series of deuterated amino-acid ester compounds can be prepared, and therefore the production cost is greatly reduced; the method provided by the invention has the advantages of mild catalytic conditions, simple catalytic system, high reaction selectivity, high safety and high synthesis efficiency, and is worthy of popularization and application.

The invention discloses a preparation method of a lithium-loaded silica gel catalyst, which is prepared by gelling silicic acid hydrosol and lithium chloride powder. The invention disperses and fixes the catalytic lithium on the silica gel carrier, and compared with the prior art, the catalytic efficiency is higher, the required catalytic conditions are milder, and it is beneficial to industrial production.

The invention discloses a dechlorination catalyst. The dechlorination catalyst is prepared by a reaction of sodium metasilicate and a metal source in an organic phase environment. Compared with the existing dechlorination catalyst, the dechlorination catalyst provided by the invention can dispersedly fix palladium and aluminum with catalysis effects to a silica gel carrier so that a contact area of the catalysis ingredients and a reaction substrate is increased. Compared with the existing dechlorination catalyst, the dechlorination catalyst provided by the invention has higher catalysis efficiency, needs mild catalysis conditions and is conducive to industrial production. The catalysis method utilizing the dechlorination catalyst is finished under the pure organic phase condition. Compared with the common water-containing condition, the pure organic phase condition improves dechlorination catalyst catalysis efficiency.

The invention discloses a controllable free radical polymerization method based on C-N bond breaking, comprising the following steps: dissolving polymerized monomers, halogenated hydrocarbons and tertiary amines in an organic solvent, and dissolving the obtained solution under a protective atmosphere react under light conditions to obtain a polymer; wherein, the polymerized monomer is a methacrylate monomer or an acrylamide monomer, and the halogenated hydrocarbon is selected from methyl α-bromophenylacetate, iso A kind of in hydroxyethyl bromobutyrate, methyl 2-bromoisobutyrate, the tertiary amine is selected from triethylamine, pentamethyldiethylenetriamine, three (2-dimethylaminoethyl) A sort of. The invention proposes a brand-new reversible deactivation free radical polymerization method, and the catalytic system has the advantages of no metal ion participation, mild catalytic conditions, high catalytic activity and the like.

The invention relates to a method for synthesizing poly(oxy-1,2-ethanediyl)methylphosphonate through catalysis by virtue of a metallic oxide and belongs to the technical field of preparation of flameretardants. The method comprises the following steps: uniformly mixing the metallic oxide, dimethyl methylphosphorate and ethylene glycol to obtain a heterogeneous mixture, adding the mixture into a three-necked flask, adding stirrers into the three-necked flask, placing the three-necked flask on an electromagnetic heating jacket at the temperature of 160-170 DEG C, stirring at constant temperature, distilling for 2-4 hours, and filtering, so that the poly(oxy-1,2-ethanediyl)methylphosphonate is obtained. The method provided by the invention has the advantages that reaction time is greatly shortened, reaction can be finished within 2-4 hours, the reaction time is almost the same compared with an equivalent excellent ionic liquid catalyst, but cost is lower, and catalytic conditions are milder. In the industry, the ionic liquid catalyst needs to carry out intermittent operation by adopting a kettle type reaction system, and the metallic oxide can carry out continuous operation, so thatproduction efficiency of industrial production of poly(oxy-1,2-ethanediyl)methylphosphonate is improved, and economic benefit is further improved.

The invention discloses a composition containing seed extractives, and aims to provide a composition with the effects of moisturizing and hydrating, resisting inflammation and relieving and resisting aging. The composition is mainly prepared from the following components: 10 to 20 parts of millet seeds, 10 to 20 parts of quince seeds, 8 to 15 parts of abelmosk seeds and 5 to 12 parts of wild soybean seeds. The composition belongs to the technical field of cosmetics.

This invention relates to a method for producing adenosine coenzyme vitamin B12 by enzyme catalyzation which utilizes the triphosphate adenosine: vitamin B12 adenosine transferring enzyme to produce the adenosine coenzyme vitamin B12, in which, the final concentration used by hydroxocobalt vitamin B12 is 0.001-0.05mol / l.

The invention discloses a preparation method of beta, gamma-unsaturated ester. A structural formula of the beta, gamma-unsaturated ester is shown in the description. The preparation method of the beta, gamma-unsaturated ester comprises the following steps: adding 1,1-diphenylethlene and 2-bromopropionate into a reaction system containing a silver catalyst, an oxidant, alkali and a solvent for reacting.