250592-91-7Relevant academic research and scientific papers
Method for recycling byproducts in synthesis of diphenyl sulfide compound
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Paragraph 0083; 0089-0091, (2021/03/30)
The invention provides a method for recycling byproducts in synthesis of a diphenyl sulfide compound. The byproducts comprise alkyl alcohol and dimethyl disulfide. The method comprises the steps of (1) mixing the byproducts in synthesis of the diphenyl sulfide compound with a sodium nitrite aqueous solution, adding concentrated hydrochloric acid for reaction, and obtaining alkyl nitrite and dimethyl disulfide; and (2) mixing the products obtained in the step (1) with copper powder, adding an aniline compound for reaction, carrying out desolvation treatment on the obtained reaction solution toobtain a diphenyl sulfide compound and byproducts, and returning the byproducts to the step (1). According to the recycling method, the byproducts do not need to be separated, the byproducts serve asraw materials to be directly applied to synthesis of the diphenyl sulfide compound, the process steps are simple and safe, cyclic utilization of the materials is achieved, and the raw material cost ofindustrial production of the diphenyl sulfide compound and the treatment cost of industrial three wastes are remarkably reduced.
Preparation method of 3-substituted phenyl-4,5-dihydroisoxazole derivative and application and intermediate thereof
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, (2019/10/01)
The invention relates to a preparation method of a 3-substituted phenyl-4,5-dihydroisoxazole derivative and application and an intermediate thereof. A cyano compound (V) is converted into an N-hydroxybenzimidium compound (VII), and then 3-substituted phenyl-4,5-dihydroisoxazole intermediate (IX) is synthesized through a diazotization chlorination reaction and a dipolar cycloaddition reaction; a reaction condition is mild and controllable, the reaction selectivity in each step is good, the yield is relatively high, production of some byproducts is avoided, the product quality is guaranteed, andindustrialization of a whole technological route is easy to implement.
Improved method for preparing topramezone
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, (2018/07/30)
The invention discloses an improved method for preparing topramezone and belongs to the technical field of chemical synthesis. The improved method takes 3-nitro-o-xylene as a raw material and is characterized in that the topramezone is obtained through oximation reaction, ethylene cyclization, palladium carbon reduction, diazotization, aldehydelation, oxidation and condensation rearrangement reaction; under optimal conditions, the total yield is 33.7 percent, the raw material is cheap and easy to obtain, the treatment is convenient in the whole process, the yield is relatively high, and a certain significance in industrialized production is realized.
Method and novel intermediate products for producing isoxazolin-3-yl-acylbenzenenes
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, (2008/06/13)
The present invention describes a process for preparing isoxazoles of the formula I where: R1is hydrogen, C1-C6-alkyl, R2is hydrogen, C1-C6-alkyl, R3, R4, R5are each hydrogen, C1-C6-alkyl or R4and R5together from a bond, R6is a heterocysclic ring, n is 0, 1 or 2; which comprises preparing an intermediate of the formula VI where R1, R3, R4and R5are each as defined above, followed by halogenation, thiomethylation, oxidation and acylation to give compounds of the formula I. Furthermore, the invention describes novel intermediates for preparing the compounds of the formula I and novel processes for preparing the intermediates.
