7 results about "Copper(I) bromide" patented technology

The invention relates to the technical field of chemistry, in particular to a synthesis process of 4-fluoro-3, 5-dimethylphenylhydrazine hydrochloride, which comprises the following steps: by taking 4-fluoro-3, 5-dimethylbromobenzene as a raw material and hydrazine hydrate as a hydrazine source, matching with alkali such as potassium hydroxide, sodium hydroxide or potassium phosphate and the like, reacting at the temperature of 60-80 DEG C to obtain the 4-fluoro-3, 5-dimethylphenylhydrazine hydrochloride. The preparation method comprises the following steps: by taking copper or nickel source catalysts such as cuprous bromide, cuprous iodide, nickel salicylate and the like, N, N-bis (2, 6-dimethylphenyl) oxamide as a ligand, hexadecyl trimethyl ammonium bromide as a stabilizer and a dioxane-water mixed system as a solvent, reacting at 80-110 DEG C under the protection of nitrogen, separating a reaction mixed solution after the reaction is finished, and separating the reaction liquid to obtain the target product. And purifying to obtain a finished product of the 4-fluoro-3, 5-dimethyl phenylhydrazine hydrochloride. Therefore, the problems that the synthesis of the 4-fluoro-3, 5-dimethylphenylhydrazine hydrochloride is poor in safety, low in production efficiency, poor in environmental friendliness, small in substrate application range and the like are solved.

This invention relates to the field of organic synthetic chemistry, specifically to a polysubstituted furan compound and its synthetic method, wherein the method comprises... β Using ketone sulfones and olefins as starting materials, polysubstituted furans are synthesized via a [3+2] cycloaddition reaction in the presence of a copper catalyst and an oxidant. This invention employs cuprous bromide as the catalyst and di-tert-butyl peroxide (DTBP) as the oxidant, reacting in dimethyl sulfoxide solvent at 100°C–130°C for 6–24 h. This method offers advantages such as high atom and step economy, broad substrate applicability, good functional group tolerance, excellent position selectivity, and high yield, with a maximum yield reaching 84%. It is suitable for large-scale synthesis and provides a new strategy for the synthesis of furans in medicinal chemistry and materials science.

The invention discloses a synthesis method of hydroxytyrosol. The synthesis method comprises the following steps: (1) reacting p-hydroxyphenethyl alcohol as shown in a formula 1 with a bromination reagent in ethyl acetate at 0-25 DEG C to generate p-hydroxybromophenethyl alcohol as shown in a formula 2; (2) under the protection of nitrogen, reacting p-hydroxybromophenethyl alcohol in an aqueous solution of alkali in the presence of a copper catalyst and a ligand at 80-100 DEG C to generate hydroxytyrosol as shown in a formula 3; the copper catalyst is cuprous bromide; the ligand is phenanthroline. The raw materials and solvents required by the synthesis method are cheap and easy to obtain, the operation process is convenient and easy to implement, the synthesis method is environment-friendly, the reactant yield is high, the quality is good, and the synthesis method is suitable for industrial large-scale production.

The invention relates to the technical field of organic synthesis, in particular to a synthesis method of cuprous bromide. The synthesis method of cuprous bromide comprises the following steps: heating an aqueous solution of hydrobromic acid to a first temperature, adding copper oxide under stirring, and mixing to obtain a first mixed solution; heating the first mixed solution to a second temperature within a first time to obtain a concentrated solution; adding an aqueous solution of hydrogen peroxide into the concentrated solution, mixing, standing for a second time at a third temperature, and filtering to obtain a filtrate; adding copper powder into the filtrate, mixing, stirring for a third time at a fourth temperature, filtering, and collecting a solid; and washing the solid with a reducing agent solution and alcohol, and carrying out vacuum drying to obtain the cuprous bromide. The synthesis method of the cuprous bromide is simple to operate and relatively low in cost, and the synthesized cuprous bromide is good in stability.

The object is to provide a gas detection element in which the decrease in sensitivity over a short period of time is suppressed. The gas sensing element of the present invention contains a solid solution of copper(I) bromide and copper(I) iodide.

The invention discloses a preparation method of copper nanocluster photocatalysts with different atomic accuracies in the technical field of photocatalysis, which comprises the following steps: firstly, respectively synthesizing two copper nanoclusters NCs, taking cuprous bromide as a raw material, reacting with 4-mercaptobenzoic acid and 2-chloro-4-fluorothiophenol, reducing by sodium borohydride, recrystallizing to prepare Cu13 NCs, and preparing the Cu13 NCs into copper nanoclusters with different atomic accuracies. The preparation method comprises the following steps: firstly, preparing Cu13 NCs, reacting Cu13 NCs with diphenyl-2-pyridine phosphine, reacting tetrafluoroborate (acetonitrile) copper with diphenyl-2-pyridine phosphine and cyclohexanol, reducing, recrystallizing to obtain Cu28 NCs, secondly, preparing bulk-phase black phosphorus (BP) through high-temperature calcination of red phosphorus, tin powder and iodine elementary substance, grinding, ultrasonically stripping and freeze-drying to obtain BP nanosheets, and finally, respectively dissolving Cu13 NCs and Cu28 NCs in dichloromethane, respectively mixing with a BP solution, and carrying out vacuum drying to obtain the Cu13 NCs / Cu28 NCs composite material. The metal cluster photocatalyst prepared by the preparation method disclosed by the invention is excellent and stable in photocatalytic reduction performance, and the Cu13 NCs / BP and Cu28 NCs / BP composite materials are finally prepared through ultrasonic treatment and freeze drying.

The invention provides a preparation method of 5-bromo-1H-1, 2, 4-triazole, which comprises the following steps: taking a compound 3-amino-1H-1, 2, 4-triazole-5-carboxylic acid as a raw material, carrying out diazotization reaction to obtain a corresponding diazonium salt solution, and reacting the diazonium salt under the action of cuprous bromide to obtain the compound 5-bromo-1H-1, 2, 4-triazole. According to the method disclosed by the invention, the compound 5-bromo-1H-1, 2, 4-triazole is finally prepared with low cost, short steps, simple operation, relatively mild reaction conditions and ideal yield, and a potential route is provided for large-scale production of the 5-bromo-1H-1, 2, 4-triazole.