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Studies on Synthesis of Sulfonamide Dyes and their Application on Various Fibres

H. D. Navadiya, N. K. Undavia and B. S. Patwa

A series of N-[4-(4-aryalazo)-phenyl]-4-(4-oxo-2-phenyl-4H-quinazolin-3-yl)-benzene sulfonamide derivatives (3) have been obtained by reaction of various coupling agent (a-o) with diazonium salt containing 4-Oxo-quinazolin moiety (2). The diazonium salt (2) is obtained by the reaction of N-(4-amino-phenyl)-4-(4-oxo-2-phenyl-4H-quinazolin-3-yl)-benzene sulfonamide with NaNO2 and HCl. The structures of the synthesized molecules have been supported by spectral data and elemental analysis. Most of the tested compounds show promising dyeing properties.