<span style="mso-bidi-language:HI">Novel synthesis of heteroarylazopyrazolones and their application as disperse dyes <i><span style="mso-bidi-language:HI">via </span></i><span style="mso-bidi-language: HI">AlCl₃-catalyzed diazocoupling of 1-aryl/heteroaryl-3-methyl-1<i>H</i>-pyrazol-2-in- <span style="mso-bidi-language:HI">5-ones in aqueous medium </span></span></span>

Abstract

1431-1436AlCl3-catalyzed diazocoupling of 1-aryl/heteroaryl-3-methyl-1H-pyrazol-2-in-5-ones 1 in water with different aryl/heteroaryldiazonium salts affords the corresponding hetcroarylazopyrazoloncs 2 as colored products with high yields. These dyes have been characterized by UV-Vis, FT-IR and 1H NMR spectroscopic techniques and elemental analysis. Cotton, wool, silk and polyesters fabrics have been dyed and their photostability and color fastness identified. </span