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Title: Synthesis of 2-(aryl/hetaryl)azo-3,4-dihydroxy-5-( 4-nitrophenyl)- thiophene-1, 1-dioxide derivatives and their dyeing properties
Authors: Mavlankar, S V
Rangnekar, D W
Keywords: 2-(Aryl/hetaryl)azothiophene-1, 1-dioxide derivatives;Azo disperse dyes;Dyeing;Polyester fibre
Issue Date: Dec-1991
Publisher: NISCAIR-CSIR, India
Abstract: Preparation of 2-(aryl/hetaryl)azothiophene derivatives (VIa-g) was achieved by coupling 3,4-dihydroxy-5-(4-nitrophenyl)-thiophene-1, 1-dioxide-2-carboxylic acid (III) with diazonium salts (Va-g) derived from aryl and hetaryl amines (IVa-g).The intermediate III was obtained in excellent yield by the condensation of diethyl oxalate and 4-nitrobenzylsulphonyl acetic acid in a single step. These compounds when applied on polyester fibres as disperse dyes gave yellow to red-violet shades with good pick-up, moderate light fastness and good sublimation fastness.
Page(s): 282-284
ISSN: 0975-1025 (Online); 0971-0426 (Print)
Appears in Collections:IJFTR Vol.16(4) [December 1991]

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