Process for the preparation of isothiazolinones

Details Process for the preparation of isothiazolinones Process for the preparation of isothiazolinones

C - Chemistry, Metallurgy

07

D

167/9.3, 260/308

C07D 275/04 (2006.01) A01N 43/80 (2006.01) C07D 275/03 (2006.01)

Patent

CA 2025207

Compounds of the general formula Image are cyclised to the corresponding isothiazolinone using a carbonyl halide of the formula RCOX where R is halogen or alkyl and X is halogen. R3 and R4 are preferably such as to form a 5 or 6 membered ring. Useful carbonyl halides are phosgene and propionyl chloride. Using acyl halides such as propionyl chloride, a mixture of the isothiazolinone and a salt of the carboxylic acid can be obtained, for example an essentially equimolar mixture of 2-methyl-4,5- trimethyl-4-isothiazolin-3-one and sodium propionate.

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