Synthesis of quinoline based bisazo disperse dyes and their dyeing performance on polyester fabric

Eleven N-(3-hydroxy-4'-R-azobenzene-1'-sulfonamidoazobenzene)-8-quinoline sulfonamides (IVa-k) were prepared by coupling diazotized N-(3-hydroxy-4'-aminobenzene-sulfonamidoazobenzene)-8-quinoline sulfon amide (III) with various, coupling components (Ra-k). The compound (I) was coupled with diazotized 4-amino-4'-acetylaminodiphenylsulfonamide giving compound (II) which on hydrolysis gave compound (III). The compounds (IVa-k) were characterized by elemental and spectral analyzes and their dyeing performance on polyester fabric was assessed.