Dyeing red with 2,6-dicyano-2'-sulfonamido-4'-amino-azo-benzenes

摘要

Azo compounds of the formula wherein R1 is alkyl, alkenyl, aralkyl, aryl or hetaryl, R2 is hydrogen or alkyl, R3 is hydrogen, alkyl, halogen, OR1 etc. R4 is hydrogen, alkyl, aralkyl, aryl or cycloalkyl, R5 is hydrogen, alkyl, alkenyl or aralkyl, Y is cyano, halogen, trifluoromethyl, nitro or SO2R1, Y1 is halogen or preferably cyano, X1 is hydrogen or a substituent with a Hammet sigma para value of -0.3 to +0.3, X2 is hydrogen, halogen etc., are useful for dyeing polyester fibre materials in clear red to violet shades with good general fastness properties.