111992-18-8Relevant articles and documents
Preparation method of sulfonyl carfentrazone-ethyl
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, (2022/04/03)
The invention relates to a preparation method of sulfonyl carfentrazone-ethyl, which takes 2, 4-dichloroaniline as an initial raw material, and comprises the following steps of: 1, carrying out nitration reaction on a benzene ring of the 2, 4-dichloroaniline; as the N-difluoromethyl substituted triazolinone ring is formed, nitration and reduction reactions on the benzene ring can be carried out before the N-difluoromethyl substituted triazolinone ring is formed, and the N-difluoromethyl substituted triazolinone ring does not need to be placed in reaction environments such as mixed acid nitration and nitro reduction in the presence of concentrated sulfuric acid and concentrated nitric acid, so that the generation of byproducts is reduced, and the synthesis yield of the compound is improved; the production cost of the compound is reduced; and moreover, the problem that an N-difluoromethyl substituted triazolinone ring is unstable under certain nitrification conditions is also avoided, so that the nitrification and reduction methods have more choices, and a more advanced sulfonyl carfentrazone-ethyl production process is favorably developed.
Method for synthesizing Sulfentrazone
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Paragraph 0050-0053, (2017/07/01)
The invention relates to a method for synthesizing Sulfentrazone. The method is characterized by comprising the steps of liberating o-chlorophenylhydrazine from o-chlorophenylhydrazine hydrochloride, which serves as a raw material, by an alkali, subjecting o-chlorophenylhydrazine to a reaction with trimethyl orthoacetate and potassium cyanate so as to obtain 1-o-chlorophenyl-3-methyl-1H-1,2,4-triazol-5-one, and then, subjecting 1-o-chlorophenyl-3-methyl-1H-1,2,4-triazol-5-one to N-alkylation, chlorination, nitration, reduction and sulfonylation, thereby obtaining the Sulfentrazone, wherein a composite catalyst and a solvent, i.e., dichloroethane are adopted in a chlorination reaction. The method for synthesizing the Sulfentrazone, disclosed by the invention, has the advantages that the o-chlorophenylhydrazine hydrochloride serves as the raw material, so that the steric hindrance of an intermediate product can be low, and the yield of the product is increased; and meanwhile, in the chlorination reaction, the composite catalyst is adopted, thus, the orientation effect on all atoms is good, and the solvent is dichloroethane, so that the recycling of the solvent is facilitated.
NOVEL FORM OF SULFENTRAZONE, PROCESS FOR ITS PREPARATION AND USE THEREOF
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Page/Page column 18, (2017/12/18)
The invention describes a new crystalline form of sulfentrazone and its preparation process. The invention also describes the analyses of the crystal through various analytical methods and the use of the crystal to prepare stable agrochemical formulation. The novel crystal form is particularly suitable for use in herbicidal compositions and in the control of unwanted plant growth.