- Synthesis method of methyl 2-chlorosulfonyl-3-methyl benzoate
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The invention provides a synthesis method of 2-chlorosulfonyl-3-methyl benzoate, and the synthesis method comprises the following steps: reacting 2-nitro-3-methyl benzoate (II) with benzyl isothiourea hydrochloride (III) and alkali in a solvent A to obtain a benzyl sulfide intermediate (IV), after the reaction is finished, extracting with a solvent B, and directly applying to oxidation reaction to obtain the 2-chlorosulfonyl-3-methyl benzoate (I). The method has the advantages of simple process, easily available raw materials, low cost and high yield, and is suitable for industrial production. Meanwhile, a shrinkage method is applied, an intermediate does not need to be separated and purified, 2-chlorosulfonyl-3-methyl benzoate is prepared through continuous reaction in a solution state; meanwhile, the benzyl isothiourea hydrochloride is easy to obtain, low in price and odorless in raw material, and the concept of a green process is fully embodied.
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Paragraph 0020-0023
(2021/06/22)
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- Substituted sulphonylamino(thio)carbonyl compounds as herbicides
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The invention relates to novel substituted sulphonylamino(thio)carbonyl compounds of the formula (I) in whichA represents oxygen, sulphur, NH, N-alkyl, N-aryl, —CH=N—, or —N=CH—or —CH=CH—,Q represents oxygen or sulphur,R1 represents respectively optionally substituted alkyl, alkenyl, alkinyl, cycloalkyl, cycloalkylalkyl, aryl, arylalkyl, heterocyclyl or heterocyclylalkyl,R2 represents cyano, nitro, halogen or represents respectively optionally substituted alkyl, alkoxy, alkoxycarbonyl, alkylthio, alkylsulphinyl, alkylsulphonyl, alkenyl, alkinyl, alkenyloxy or alkinyloxy, andR3 represents respectively optionally substituted heterocyclyl having 5 ring members of which at least one represents oxygen, sulphur or nitrogen and a further one to three may represent nitrogen,(except for certain individual prior art compounds), furthermore to salts of novel compounds of the formula (I), to various processes and novel intermediates for preparing the novel compounds and to their use as herbicides.
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- Process for preparing sulfonylureas
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This invention relates to a process for the preparation of a benzene sulfonylurea herbicide by reacting a sulfonyl chloride with a cyanate salt in the presence of a heterocyclic amine, a base and a solvent.
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- Fluoroalkoxy amino triazines for control of weeds in sugar beets
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This invention comprises novel fluoroalkoxy amino triazines, agriculturally suitable compositions containing them, and their method-of-use as preemergence and/or postemergence herbicides or plant growth regulants.
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