Synthesis and application of some bisazo acid dyes based on 4-hydroxy quinoline quinazoline system on various fabrics

Fifteen 3-(4 ' -R-azo-1 ' -phenylazo)-4-hydroxy quinolino-[1,2-b]4-oxoquinazolines (IVa-o) were prepared by coupling diazotised 3-(4 ' -amino-1'-phenylazo)-4-hydroxy quinolino-(1,2-b]-4-oxoquinazoline (III) with various coupling components (a-o). The compound (1) was coupled with diazotised p-aminoacetanilide giving compound II, which on hydrolysis gave compound III. The compounds IVa-o were characterised by elemental and spectral analyses and their dyeing performance on silk, wool and nylon fabrics was assessed.