SYNTHESIS OF SOME NEW HETEROARYLBISAZO DYES DERIVED FROM p-AMINOAZOBENZENE
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, 1H NMR, and mass spectroscopy.