111493-52-8Relevant articles and documents
PROCESS OF PREPARATION OF AZIMSULFURON
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Paragraph 0211, (2015/04/28)
The present disclosure provides process for preparation of azimsulfuron or its salts, isomers, and other derivatives thereof. The process involves treating a compound of formula I, with aqueous acetic acid or formic acid and chlorine gas or sodium hypochlorite in presence of hydrochloric acid in chlorinated solvents such as dichloromethane, 1,2-dichloroethane or with aqueous acetic acid and N-chlorosuccinimide or hydrogen peroxide in presence of hydrochloric acid in aqueous cyclic ether such as tetrahydrofuran, 1,4-dioxane to obtain 1-methyl-4-(2-methyl-2H-tetrazol-5-yl)-1H-pyrazole-5-sulfonyl chloride; converting the sulfonyl chloride to a sulfonamide and treating the sulfonamide with a phenyl(4,6-dimethoxypyrimidin-2-yl) carbamate to obtain azimsulfuron or its salts, isomers, and other derivatives thereof.
SUBSTITUTUED PYRAZOLE COMPOUNDS AND PROCESS FOR PREPARATION THEREOF.
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Page/Page column 80, (2014/01/17)
The present disclosure provides a compound of formula I, its derivatives, salts, stereo-isomers, or regio-isomers thereof, useful as intermediates in preparation of sulfonamide or sulfonyl urea growth regulators or herbicides. Formula I The present disclosure further provides a process for preparing compound of formula I, its derivatives, salts, stereo-isomers, or regio-isomers thereof.
Synthesis of 5-Chloropyrazoles by Chlorodiazoniation with Sulfur Dioxide
Yamamoto, Susumu,Morimoto, Katsushi,Sato, Toshiaki
, p. 1545 - 1547 (2007/10/02)
A facile synthesis of 5-chloropyrazoles 4a-e from 5-aminopyrazoles 2a-e via diazotization followed by chlorodediazoniation is described.A new application of sulfur dioxide as a catalyst was demonstrated to be the best for the chlorodediazoniation of diazonium chlorides 3a-e.
