43156-48-5Relevant articles and documents
Synthetic method of fenbendazole
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, (2021/08/14)
A synthetic method of fenbendazole belongs to the technical field of insect repellents, and specifically comprises the following steps: carrying out condensation reaction on 5-chloro-2-nitroaniline and a sodium thiophenol aqueous solution in a mixed solution of n-propyl alcohol and water to obtain 5-thiophenyl-2-nitroaniline; carrying out reduction reaction on the 5-thiophenyl-2-nitroaniline in a high-pressure kettle under the catalysis of raney nickel to generate 4-thiophenyl o-phenylenediamine; and mixing the 4-thiophenyl o-phenylenediamine and N-(trichloromethyl) methyl carbamate for a cyclization reaction to obtain fenbendazole; the method has the advantages that conditions are mild, operation is easy and convenient, ammonium chloride can be prevented from being generated in the cyclization process, and the three-waste cost is low; the generation of amine salt is avoided, and the treatment cost of three wastes is greatly reduced; and the yield of the fenbendazole can reach 84.27% to 89.99%, and the purity of the fenbendazole can reach 96.39% to 99.71%.
Preparation method of 4-thiophenyl-o-phenylenediamine
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, (2021/07/31)
The invention provides a preparation method of 4-thiophenyl-o-phenylenediamine, wherein the preparation method comprises the steps: by taking 2-nitro-4-thiocyano aniline and aniline as initial raw materials, firstly, reacting 2-nitro-4-thiocyano aniline with sodium sulfide to obtain 3-nitro-4-amino thiophenol sodium, and reacting aniline with sodium nitrite under an acidic condition to generate benzene diazonium chloride; and then condensing the benzene diazonium chloride and the 3-nitro-4-amino thiophenol sodium to obtain 2-nitro-4-thiophenyl aniline, and then carrying out a Raney nickel hydrogenation reduction reaction to obtain the 4-thiophenyl-o-phenylenediamine. The method has the characteristics of high economic benefit, low three-waste amount, low cost and the like, the total yield can reach 64.58%, and the method belongs to the technical field of organic chemical industry.
A preparation method of curing melanotumor
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Paragraph 0039; 0040, (2016/10/27)
The invention discloses a preparation method of fenbendazole and provides a brand-new synthesis route of the fenbendazole. The fenbendazole is prepared from m-dichlorobenzene as a starting material through the steps of nitrification, condensation, amination, reduction and cyclization. The preparation method is characterized in that the starting material m-chloroaniline in the existing industrial route is changed to the cheap m-dichlorobenzene; the existing reduction technology with sodium sulfide dihydrate is changed to the clean and high-efficiency reduction technology; and the new synthesis technology is concise and simple, high in efficiency, slight in pollution, high in quality, and suitable to industrial production.