Synthesis of Azo-Dispersed Dyes Derived From 2-(2-Cyanoacetamido)-4,5,6,7-Tetrahydrobenzo-[b]Thiophene-3-Carboxamid]

Coupling of 2-(2-cyanoacetylamino)-4,5,6,7-tetrahydrobenzo[b]thiophene-3-carboxamide (3) or 2-[2-(5-oxo-3-phenylthiazolidin-2-ylidene)]2-cyanoacetamido-4,5,7-tetrahydrobenzo[b]thiophene-3-carboximide (6) with various diazotized aryl amines in pyridine gave the corresponding aryl hydrazonopropionitrile derivatives. Some of the synthesized dyes were applied to polyester fabrics as dispersed dyes in which their colour measurements and fastness properties were evaluated.