Novel dyes and intermediates for synthetic‐polymer fibres: Synthesis and dyeing performance of 1‐aryl‐5‐hetarylphenylazo‐4‐hydroxypyrazole derivatives and their isomeric 1‐hetarylphenyl‐5‐arylazo analogues as disperse dyes for polyester fibre
Abstract:Abstract:In a multi-step synthesis, a series of 5-arylazo-4-hydroxy-]-(substituted imidazol-5-on-2-ylphenyl)pyrazole-3-carboxanilide dyes (VIIIa-i), their isomeric 4-hydroxy-l-phenyl-5-(substituted imidazol-5-on-2-ylphenylazo)pyrazole-3-carboxanilide analogues (XIIa-i) and a related series of 4-hydroxy-1 -phenyl-5-(substituted oxazol-5-on-2-ylphenylazo)pyrazole-3-carboxanilide derivatives (XIa-h) were prepared with a view to evaluating and comparing the assessment of their dyeing performance on synthetic polym… Show more
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