NOVEL SULPHOARYLAZO 4-PYRAZOLONE-BASED TARTRAZINE DYE ANALOGUES

In a multistep synthesis, a novel series of 4-pyrazolone–based tartrazine dye analogues were prepared benzimidazol-5-yl acetoacetamide derivative I. Chemical structure of the hitherto prepared dyestuffs were confirmed on the basis of correct elemental analysis as well as spectral data. The degree of exhaustion of the hitherto synthesized 3-[2-(oxoimidazo-5-yl) carboxamido] tartrazine dye analogues was determined and found to be in the range of 92.6–97.8%. The latter high ratios might be ascribed to the presence of the cyclic amide function in structure of these dyestuffs.