Water-soluble trisazosulfonated dyestuff derived from 2- aminophenol-4- sulfonic acid, resorcinol, 4,4'-diaminobenzanilide and m- aminophenol

摘要

A water-soluble triazo dyestuff of the formula: ##STR1## The dyestuff, which is useful in dyeing cotton and other cellulosic fibers, is prepared by diazotizing 2-aminophenol-4-sulfonic acid, coupling the diazotized sulfonic acid with resorcinol, treating the reaction mixture with a copper complexing agent at 35°-40° C and a pH of 5-5.5, separately tetraazotizing 4,4'-diaminobenzanilide, coupling the tetraazotate with the previously formed reaction product to form a diazo- disazoic reaction product, and coupling the latter product with m- aminophenol to produce the desired dyestuff.