Synthesis and characterization of some azo-heterocycles incorporating pyrazolopyridine moiety as disperse dyes

Abstract

IN for THIS the synthesis research of paper, some we pyrazolopyridine used 3-aminopyrazolo[3,4- azo compounds. b]pyridine The as key key starting intermediate fused heterocyclic 3-aminopyrazolo[3,4-b]pyridine is prepared by the reaction of 2-chloro-4,6-dimethylnicotinonitrile with hydrazine hydrate. The azo-coupling reaction of the pyrazolopyridinyl diazonium salt with a variety of coupling agents such as β-naphthylamine, β-naphthol, thiazole, and aniline derivatives afforded the corresponding arylazopyrazolo[3,4-b] pyridine derivatives in relatively high yield. The chemical structures were established using FTIR, elemental analysis (C, H, N), and 1H-NMR, 13C-NMR. The prepared arylazopyrazolo[3,4-b] pyridine disperse dyes were applied to dye polyester garments to provide good color fastness properties.