SYNTHESIS OF SOME NEW HETEROARYLBISAZO DYES DERIVED FROM p-AMINOAZOBENZENE

Abstract

Several novel arylbisazopyrazolo[1,5-a]pyrimidines were synthesized from diazotization of 4-aminoazobenzene and coupling with malononitrile and then refluxed with hydrazine hydrate to give 3,5-diamino-4-arylbisazo-1H-pyrazole.The later compound was diazotized and coupled with bifunctional reagents to produce novel heteroarylbisazo dyestuffs. Structural characterization of these novel dyes was carried out using IR, 1 H NMR, and mass spectroscopy.