New azodisperse dyes with thiazole ring for dyeing polyester fabrics

摘要

Diazotized aryl amines were coupled with 2-aminothiazole derivatives to give 5-arylazo-2-aminothiazoles, which on reaction with different reagents such as acetic anhydride and benzoyl chloride yielded the corresponding 2-(N-acetyl-amino)-5-arylazothiazole and 2-(N-benzoyl-amino)-5-arylazothiazole derivatives. These dyes were applied to polyester as disperse dyes and their fastness properties were evaluated. The azo/hydrazo tautomerism of the dyes was judged by density functional calculations at the B3LYP/6-31G level.