Process for the preparation of 1,2-benzisothiazolin-3-ones

Details Process for the preparation of 1,2-benzisothiazolin-3-ones Process for the preparation of 1,2-benzisothiazolin-3-ones

C - Chemistry, Metallurgy

07

D

C07D 275/04 (2006.01)

Patent

CA 2200872

A process for making a 2-alkylbenzisothiazolinone which comprises reacting a bisamide of formula (2) in water or an organic liquid containing water with a bisulphite or bisulphite release agent to form a Bunte salt and converting the Bunte salt under alkaline conditions to 2-alkyl-BIT. R is alkyl. Preferred substituents R are butyl, hexyl, 2-ethylbutyl and 2-ethylhexyl.

Un procédé de fabrication de la 2-alkylbenzisothiazolinone consiste à faire réagir dans l'eau ou un liquide organique contenant de l'eau, un bisamide représenté par la formule (2) avec un bisulphite ou un agent libérant du bisulphite pour former un sel de Bunte. Le procédé consiste ensuite à convertir ce sel de Bunte sous conditions alcalines en 2-alkyl-BIT. R représente un alkyle. Les R de substitution préférés sont butyle, hexyle, 2-éthylbutyle et 2-éthylhexyle.

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