NEW REACTIVE DYES CONTAINING FLUORINE SUBSTITUENTS IN THE VINYLSULFONE GROUP

New reactive dyes having good affinity for the fibre are obtained by i ntroducing fluorine atoms into the vinylsulfone group of conventional reactive dyes. this new reactive centre for dyes which form a covalent link with the fibre is the SO2CF=CFCl group. Interaction of 1,2-dichl orodifluoroethene with 4-N-methoxycarbonylaminothiophenol gives bonyla minothiophenyl(2-chloro-1,2-difluoroetheynl) sulfone. Diazotization an d coupling gives azo dyes which colour polyamide fibres from an alkali ne dyebath, with formation of a covalent linkage.