This paper introduces the methods of preparation of 3,5,6-trichloropyridin-2-ol, and mainly discusses the preparation from trichloroacetyl chloride and acrylonitrile by separately conducting the individual addition, cyclization and aromatization steps.

The outlets of methane tetrachloride produced in the production facilities of chloromethane in China at present were proposed,such as conversion to diphenyl ketone,ethylene tetrachloride,cinnamic acid,trichloroacetyl chloride,methane chloride and chloroform.

Thus,91 0 g trichloroacetyl chloride and 34 5 g acrylonitrile were refluxed with 1 4 g catalyst C D in 200 mL nitrobenzene at 145 ℃ for 4 h and.

A by-product which will result in unfavorable effects for production technology is usually formed in the process of synthesizing trichloroacetic chloride.

Fenchlorazole ethyl was synthesized in the suitable solvent at 115℃ with α amino (2,4 dichlorophenylhydrono) glyoxylic ethyl ester and trichloroacetic chloride (molar ratio 1∶1) as the raw materials.

Three possible processes to synthesize trichloroacetic chloride was evaluated based on the yield,cost,waste treatment, equipment and operation.

Synthesis of trichloro-acetic chloride and its application;