Disperse Dyes: Part XIX-Synthesis of Disperse Azo Dyes from 2-Amino-8Hpyrazolo (4,5-g) benzothiazole and Their Dyeing Properties

Abstract

13-15<span style="font-size:11.0pt;line-height:115%; font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:"times="" roman";mso-ansi-language:en-us;="" mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">2-Amino-8H-pyrazolo (4,5 -g) benzothiazole has been synthesized in high yield (90%) by the action of ammonium thiocyanate and bromine in glacial acetic acid on 6-aminoindazole. An angular structure, based on NMR and mass spectral data, has been assigned to the resulting heterocyclic amine. The amine was diazotized in phosphoric acid (87%) and coupled with various coupling components in acetic acid-ethanol cosolvent. The dyeing properties of the dyes obtained have been studied.</span