66results about How to "Increase electrophilicity" patented technology

The invention discloses a Fe-doped Ni3Se4 nanorod / nanosheet grading array structure material, a preparation method and application of the material. The preparation method comprises the following steps that Se powder and a reducing agent are dissolved into a mixed solution of ammonia water and deionized water, foam nickel is obliquely put into the mixed solution, and foam nickel with a precursor is obtained through a hydrothermal reaction; iron salt is dissolved into a mixed solution of ethanol and NaClO, and the foam nickel with the precursor is put in, and a product is obtained through a solvothermal reaction. Compared with the prior art, by means of a low-temperature liquid phase synthesis method, Fe<3+> ions are doped into a lattice of a Ni3Se4 grading nano-structure, the method is simple, and the cost is low; the material serving as an electrocatalyst of an oxygen evolution reaction (OER), a hydrogen evolution reaction (HER) and a whole water decomposition reaction has the advantages of being large in active area, good in electrical conductivity and the like; the Fe-doped Ni3Se4 nanorod / nanosheet grading array structure material can achieve high-efficiency whole water decomposition at high electric current density, and the excellent stability is shown at the low electric current density and the high electric current density.

The invention discloses a method for preparing acetyenic ketone by coupling carboxylate triazinyl ester with terminal alkyne. According to the method, palladium acetate is taken as a catalyst, and a carboxylate triazinyl ester compound is taken as an electrophilic reagent to react with an electrophilic reagent terminal alkyne so as to generate an acetyenic ketone compound under a mild condition. The method disclosed by the invention is simple to operate; the used carboxylate triazinyl ester compound is simple to synthesize; the reaction needs no ligand or alkali; the amount of used catalyst is small; the cost is relatively low; substrates are wide in applicability; and product yield is high.

A palladium(II) complex of formula (1) or a palladium(II) complex of formula (3).Also, processes for the preparation of the complexes, and their use in carbon-carbon and carbon-heteroatom coupling reactions.

Whilst methodologies for the Kinetic Resolution of alcohols are well established, no analogous direct methods exist for the highly selective, direct catalytic Kinetic Resolution of thiols (i.e., R—SH). The present invention relates to a method for resolving stereoisomeric mixtures of thiols. In particular, the present invention relates to purely organocatalytic mediated resolution of enantiomeric mixtures of thiols without the need for enzymes. Also disclosed are some novel catalysts. Such catalysts may comprise a cinchona alkaloid-derived moiety.

While methodologies for the Kinetic Resolution of alcohols are well established, no analogous direct methods exist for the highly selective, direct catalytic Kinetic Resolution of thiols (i.e., R—SH). The present invention relates to a method for resolving stereoisomeric mixtures of thiols. In particular, the present invention relates to purely organocatalytic mediated resolution of enantiomeric mixtures of thiols without the need for enzymes. Also disclosed are some novel catalysts. Such catalysts may comprise a cinchona alkaloid-derived moiety.

The invention provides an organometallic iridium complex and a simple synthesis method and uses thereof, the method comprising: step (a): subjecting a t-Bu-Ar1-MgX and a nitrogen-containing heterocyclic aromatic salt to a nucleophilic reaction to obtain an intermediate product, wherein Ar1 is an arylene group having 5 to 16 carbon atoms or a sulfur-containing heteroarylene group having 4 to 14 carbon atoms; X is a halogen atom; the nitrogen-containing heterocyclic aromatic salt is a salt that contains a t-Bu-Ar2 group, and Ar2 is a nitrogen-containing heteroarylene group having 5 to 14 carbonatoms; t-Bu is a tertiary butyl group; step (b): subjecting the intermediate product and an oxidizing agent to an aromatic cyclization reaction to obtain a coordination compound; and step (c): reacting the coordination compound with iridium acetylacetonate to obtain an organometallic iridium complex. The organometallic iridium complex has a structure represented as formula (I).

The invention provides a preparation method of a novel high-efficiency cleaning agent, wherein the formula of the cleaning agent is: 8-15% of alkyl glycoside, 2-8% of fatty alcohol polyoxyethylene ether, 10-15% of nonylphenol polyoxyethylene ether %, coconut oil fatty acid diethanolamide 10‑15%, antifoam agent 2‑5%, polyether modified silicone type defoamer 5%‑8%, water balance; of which polyether modified silicone type defoamer The preparation method of the foaming agent is as follows: preparing hydrogen-containing silicone oil; preparing mixed solution A; synthetic reaction; obtaining viscous solid B which is the polyether modified silicone type defoamer. The object of the present invention is to provide a preparation method of a cleaning agent with low foam height and good cleaning effect.

The invention discloses an allopurinol impurity C and its preparation method, which belongs to the field of compound synthesis. The key point of the technical scheme is that S1: 3-aminopyrazole-4-formamide hemisulfate is dissolved in formamide, and 80wt% Hydrazine hydrate and 98wt% concentrated sulfuric acid are heated up to react; S2: After the reaction of S1 is completed, cool to room temperature, add sodium hydroxide solution to adjust the pH value of the solution to alkaline, add water and ethyl acetate, extract and separate the liquid, and collect the water phase; S3: Add n-butanol to the water phase in S2, extract and separate the liquids, collect the n-butanol phase, concentrate the n-butanol phase until solids are precipitated, filter with suction, and dry to obtain the product. The invention has mild reaction conditions, is easy to operate, has high product purity, can replace the official reference substance, and the obtained product has great significance for the quality research of allopurinol.

The invention discloses a method for modifying a grid-shaped lithium-ion battery diaphragm with high wettability, and belongs to the technical field of modification of the lithium-ion battery diaphragm. The key points of the technical scheme of the present invention are: soak the lithium-ion battery diaphragm in the mixed solution formed by nitric acid and potassium permanganate, seal it and place it in a constant temperature water bath at 20-60°C for 6-72h, and then use hydrogen peroxide or hydrochloric acid solution After cleaning, decompression and suction filtration, air dry naturally, trim the edges and vacuum dry at 30-60°C for 12-72 hours to obtain a highly wettable grid-shaped lithium-ion battery separator with a thickness of 25-32 μm and a porosity of 40%-70%. . The highly wettable lithium-ion battery diaphragm prepared by the invention has uniform pore size, good wettability and high ion conductivity, which improves the hydrophilicity and electrophilicity of the lithium-ion battery diaphragm, and also improves the charge-discharge capacity of the lithium-ion battery , the prepared highly wettable lithium-ion battery separator is resistant to electrolyte corrosion, has a simple process, strong stability and is easy for industrial application.

The invention provides a heterogeneous metal-free fenton catalyst and a preparation method and a purpose thereof. The catalyst is a carbon base material bonded with halogenated quinine on the surface; the carbon base material and the halogenated quinine have a synergistic effect; the catalyst is prepared through grafting the halogenated quinine on carbon base materials or introducing chlorine gas for oxidization in the carbon base material carbonization process. The catalyst has the advantages that the cost of generating hydroxyl radicals is low; the process is safe, simple and convenient; the conditions for generating hydroxyl radicals is mild; no secondary pollution exists; the free radical yield is high; the yield is continuous and stable; the hydroxyl radicals can be effectively generated under the condition of not using chemical products with harmful effects on the human body; no byproduct exists; in addition, the additional addition of difficult-to-separate substances is not needed; important application values are realized in the fields of organic contaminant degradation and the like.

The invention provides a preparation method of a polyether modified organic silicon defoamer containing low-foaming cleaner. The polyether modified organic silicon defoamer containing low-foaming cleaner is composed of 1.0-1.2% of twin anionic surfactant, 6-10% of nonionic surfactant, 0.5-1.0% of modified sodium disilicate, 0.25-0.5% of sodium carbonate, 0.5-1.1% of triethanolamine, 1.0-1.5% of dipropylene glycol butyl ether, 0.5-1.0% of polyethylene glycol ethyl ether, 0.5-1.0% of solubilizer, 5-8% of polyether modified organic silicon defoamer, 2-4% of foam inhibitor and water as balance, wherein the preparation method of the polyether modified organic silicon defoamer comprises preparing hydrogen silicone oil, preparing a mixed solution A and performing synthesis to obtain a thick solidB, namely, the polyether modified organic silicon defoamer. According to the preparation method of the polyether modified organic silicon defoamer containing low-foaming cleaner, the prepared p polyether modified organic silicon defoamer containing low-foaming cleaner is low in foam height and good in cleaning effects.

The invention relates to a novel process for the preparation of C-4 coupled flavonoids, proanthocyanidins and analogues thereof. According to a specific application of the invention, there is provided a method for the preparation of proanthocyanidins and proanthocyanidin analogues.

The invention provides a method for preparing a low-foaming cleaning agent, wherein the formula of the low-foaming cleaning agent is: anhydrous sodium metasilicate 1.6%-2.0%, polytricarboxylic acid ester 2%-4%, carboxylic acid amine Corrosion inhibitor 1%-3%, benzotriazole 1%-3%, polyacrylic acid 1%-3%, polyether modified silicone type defoamer 5%-8%, foam inhibitor 2%- 4%, water balance; wherein the preparation method of polyether modified silicone type defoamer is: prepare hydrogen-containing silicone oil; prepare mixed solution A; synthesis reaction; obtain viscous solid B which is polyether modified silicone Type defoamer. The object of the present invention is to provide a preparation method of a low-foam cleaning agent with low foam height and good cleaning effect.