Process for the quaternisation of 1,3,4-thiadiazole-azo dyestuffs

Abstract

Abstract 1. Process for the preparation of 1,3,4-thiadiazolium dyestuffs of the general formula see diagramm : EP0045402,P10,F1 wherein R denotes hydrogen ; alkyl ; aryl ; alkyl- or arylmercapto ; alkyl- or arylsulphonyl ; alkoxy or aryloxy ; amino which can be monosubstituted or disubstituted by alkyl, alkenyl or aralkyl or monosubstituted by aryl, acyl, cycloalkyl, amino, (di)alkylamino, aralkylamino, arylamino or a heterocyclic radical ; or a heterocyclic radical, K denotes C1 -C4 -alkyl and An**(-) denotes an anion, by quaternisation of 1,3,4-thiadiazole-azo dyestuffs of the formula see diagramm : EP0045402,P10,F2 with quaternising agents of the formula Y-SO3 -R1 wherein Y represents aryl or OR1 , in the presence of a compound which is capable of binding acids, characterised in that the quaternisation is carried out in an aqueous medium.

Inventors

• 👤 Hauke Dr. Fürstenwerth

Bibliographic Details