Abstract: A phenyl amino compound having a tertiary amino group contain one or two N-bonded --C.sub.2 H.sub.4 CONHC(CH.sub.3).sub.2 CH.sub.2 COCH.sub.3 moieties; said tertiary amino group being bonded through the nitrogen atom to the phenyl group. These compounds are suitable for use as coupling agents in the preparation of keto-amido containing aminophenyl-azo dyestuffs.

Abstract: A benzothiazole azo dyestuff containing a benzene coupling component which, para to the azo bridge, is substituted by a secondary or tertiary amine group containing one or two N-bonded --C.sub.2 H.sub.4 --CO--NHC(CH.sub.3).sub.2 CH.sub.2 COCH.sub.3 moieties. These dyestuffs are suitable for dyeing synthetic fibers.

Abstract: An azo dyestuff containing a benzene coupling component which para to the azo bridge is substituted by a secondary or tertiary amine group containing one or two N-bonded --C.sub.2 H.sub.4 CONHC(CH.sub.3).sub.2 CH.sub.2 COCH.sub.3 said dyestuff having the general formula ##SPC1##Wherein D is the radical of a diazo component and the phenyl ring can be substituted or unsubstituted. These dyestuffs are suitable for dyeing synthetic, particularly polyester fibers. The dyes undergo durable press treatment without obvious loss of fastness properties such as light or ozone fastness.