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Title: Synthesis of 3-arrrino-2-arylazo-4,6-dimethylthieno[2,3-b]pyridines and their application on polyester fibres as disperse dyes
Authors: Rangnekar, D W
Kamat, P Y
Keywords: 2-Arylazothieno[2,3-b]pyridines;Disperse dyes;Polyester fibre
Issue Date: Jun-1992
Publisher: NISCAIR-CSIR, India
Abstract: 3-Cyano-4,6-dimethyl-2-(1H)-pyridone(III) was treated with phosphorus pentachloride in refluxing phosphorus oxychloride to give 2-chloro-3-cyano-4,6-dimethylpyridine(IV) which was reacted with thioglycolic acid in refluxing methanol in the presence of sodium methoxide to result sodium salt of 3-amino- 4,6-dimethylthieno[2,3-b]pyridine-2-carboxylic acid (V).Various aryl diazonium compounds (VIa-d) were coupled with V to give 3-amino-2-arylazo-4,6-dimethylthieno[2,3-b]pyridines(VIIa-d) with the replacement of carboxylic acid group. The compounds VIIa-d when applied on polyester fibres gave orange to violet shades with excellent pick-up, low light fastness and good to very good sublimation fastness.
Page(s): 98-100
ISSN: 0975-1025 (Online); 0971-0426 (Print)
Appears in Collections:IJFTR Vol.17(2) [June 1992]

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