Dichlorotrifluoromethylpyridine
Product Name: 2,3-dichloro-5-(trifluoromethyl)pyridine (2,3-dichloro-5-(trifluoromethyl))
Uses: Intermediate for the insecticides Fluazuron and chlorfluazuron, also used in the synthesis of the herbicide Arsenopyrrol (Gaylordiazepoxide).
Fluazuron and chlorfluazuron intermediate, used for synthesis of haloxyfo-F-methyl.
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Innehåll
The use and synthesis of dichlorotrifluoromethylpyridine.
It is prepared by using 2-amino-5-methylpyridine as raw material, firstly chlorinated, then diazotized, and reacted in the presence of CuCl to obtain 2,3-dichloro-5-trichloromethylpyridine, and then reacted with hydrogen fluoride to obtain the product.
It is also possible to use 2-chloro-5-methylpyridine as raw material, first chlorinate the side chain to obtain 2-chloro-5-trichloromethylpyridine, then further chlorinate on the ring to obtain 2,3-dichloro-5-trichloromethylpyridine, and then fluorinate with hydrogen fluoride to obtain the product.
The preparation method is to use 3-methylpyridine as raw material in the presence of a catalyst, chlorination and fluorination to produce this product.
It is also possible to use 2-chloro-5-trichloromethylpyridine for cyclic chlorination to obtain 2,3-dichloro-5-trichloromethylpyridine, and then fluorinated with hydrogen fluoride to obtain the product.
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