37results about How to "Facilitate addition reaction" patented technology

Provided are a novel isocyanide compound, a hydrosilylation reaction catalyst having excellent handling properties and storage properties that allows a hydrosilylation reaction to proceed under moderate conditions by using the isocyanide compound, and a method for producing an addition compound by a hydrosilylation reaction using the hydrosilylation reaction catalyst. A hydrosilylation reaction catalyst prepared from a catalyst precursor comprising a transition metal compound of groups 8, 9, or 10 of the periodic table, excluding platinum, such as an iron carboxylate, cobalt carboxylate, or nickel carboxylate, and a ligand comprising an isocyanide compound having an organosiloxane group.

A hydrosilylation reaction catalyst prepared from: a catalyst precursor comprising a transition metal compound, excluding platinum, belonging to group 8-10 of the periodic table, e.g., iron acetate, cobalt acetate, nickel acetate, etc; and a ligand comprising a carbine compound such as 1,3-dimesitylimidazol-2-ylidene, etc.. The hydrosilylation reaction catalyst has excellent handling and storage properties. As a result of using this catalyst, a hydrosilylation reaction can be promoted under gentle conditions.

The invention discloses a synthetic method of hexamidine. Hexamidine is a key raw material for producing antibiotic medicines hexamidine salts (such as dihydrochloride and dihydroxyethyl sulfonate). The synthetic method of hexamidine comprises the following steps: 1, reacting p-cyanophenol with 1,6-dibromohexane in an ethanol-water solution of sodium hydroxide to prepare 1,6-(p-cyanophenyl)hexyl diether (an intermediate I); 2, carrying out alcoholysis on the intermediate I in ethanol-toluene under the catalysis of trifluoroacetic acid or methanesulfonic acid to prepare 1,6-(p-ethyl iminoformate phenyl)hexyl diether (an intermediate II); and 3, carrying out aminolysis on the intermediate II in a methanol-ammonia solution to prepare hexamidine. The total yield of three-step synthesis is greater than 72%, and a nuclear magnetism identification result shows that the above obtained product is a preconceived structure product. The method is suitable for large-scale industrial production.

The invention provides a pyrido[1,2-a][1,2,4]triazole carbene ligand as well as a synthesis method and application thereof. A pyrido[1,2-a][1,2,4]triazole carbene-gold complex formed from the pyrido[1,2-a] [1,2,4]triazole carbene ligand shown as a formula V and gold can be applied to alkyne catalytic addition reaction, has Lewis acid / alkali double activation centers, and can depend on the 'synergistic activation effect' of the double activation centers, so that the catalytic effect which cannot be achieved or cannot be achieved by a conventional ligand is achieved, and the addition reaction ofa nucleophilic reagent to multiple bonds can be greatly accelerated.

The invention discloses modified abietate for water-based alkyd resin and a method for manufacturing the modified abietate, and relates to the field of chemical technologies. The modified abietate comprises, by weight, 55-60% of first-grade rosin, 10-15% of soybean oil fatty acid, 1-5% of diphenol-based methane, 1-5% of paraformaldehyde, 19.8-27.5% of maleic anhydride and 0.2-0.5% of zinc oxide. The modified abietate and the method have the advantages that the cost of the water-based alkyd resin with the modified abietate can be lowered to a certain degree during actual production and application, and pollution can be reduced.

The invention provides a method for detecting an epoxy equivalent weight. The method comprises the following steps of: (a) uniformly mixing butanone, ethanol and hydrochloric acid to obtain a hydrochloric acid-ethanol-butanone solution; preheating polyethylene glycol to 100-110 DEG C, adding an epoxy compound, dissolving and cooling to obtain a sample solution to be detected; (b) adding the hydrochloric acid-ethanol-butanone solution to the sample solution to be detected, and vibrating; and (c) titrating the mixed solution obtained in the step b by using a sodium hydroxide standard solution till the solution is neutral, and calculating the epoxy equivalent weight according to the use amount of the sodium hydroxide. The method for detecting the epoxy equivalent weight, provided by the invention, has the characteristics of wide application range, short detection time, accurate result and capability of controlling the end point of an epoxy resin synthetic reaction in time.

The invention discloses a production process for one-step synthesis of brominated SBS, which belongs to the technical field of brominated SBS production, and comprises the steps of: dissolving SBS with an organic solvent, adding a brominating agent diluted with an organic solvent, the brominating agent adopts bromine The mixture of element and tribromide, the tribromide is trimethylphenylammonium tribromide, add catalyst, the catalyst is tin tetrachloride, the bromination reaction temperature is 10-40°C, and the reaction time is 2 ‑8h; decolorize, wash, and crystallize the feed solution after the above reaction, then pour the crystallized material into a centrifuge, wash with water after centrifugation, filter, and dry to obtain the brominated SBS product. In the present invention, bromine and a small amount of tribromide are added as bromination agents in the production process, and the hydrogen bond substitution reaction is suppressed by adding an appropriate amount of catalyst, so that the addition reaction is the main one, the side reactions are reduced, and the product structure is more stable. The thermal stability of the brominated SBS is improved, and the reaction is a one-step production process, which improves the production efficiency.

A hydrosilylation reaction catalyst prepared from: a prescribed transition metal compound such as iron pivalate, cobalt pivalate, iron acetate, cobalt acetate, or nickel acetate; a ligand comprising t-butylisocyanide or another isocyanide compound; and a borane compound, Grignard reagent, alkoxysilane, or other prescribed promoter makes it possible to promote a hydrosilylation reaction under moderate conditions, and has exceptional handling properties and storage stability.

A cobalt complex represented by formula (1), which exhibits excellent catalytic activity in hydrosilylation reactions and is excellent in terms of handleability and solubility in silicones. {In formula (1), R1 to R3 each independently represent a hydrogen atom or a C1-30 monovalent organic group which may have been substituted by a halogen atom and may be separated by one or more atoms selected from among oxygen, nitrogen, and silicon atoms, and at least one pair among R1 to R3 may be bonded together to form a C1-30 bridged substituent which may be optionally separated by one or more atoms selected from among oxygen, nitrogen, and silicon atoms; the L moieties each independently represent an isocyanide ligand represented by the formula CN-R4 (2) (wherein R4 represents a C1-30 monovalent organic group which may have been substituted by a halogen atom and may be separated by one or more atoms selected from among oxygen, nitrogen, sulfur, and silicon atoms); and n is 4}.