Synthesis of Novel Azo Disperse dyes Derived from 4-Aminoantipyrine and their Applications to Polyester Fabrics

Nine variously substituted azo dyes derivatives 2-10 of antipyrine were prepared. The effects of the nature and orientation of the substituents on the color and dyeing properties of these dyes on polyester fibres were evaluated. The newly synthesized compounds were characterized by elemental analyses and spectral data (IR, 1H NMR, 13C-NMR and MS). The investigated dyes were applied to polyester fabrics and showed good light, washing, heat and acid perspiration fastness. The remarkable degree of brightness after washings is indicative of good penetration and the excellent affinity of these dyes for the fabric. The results in general revealed the efficiency of the prepared compounds as new azo dyes.