Azo dyestuffs and intermediate products for their preparation

A water soluble azo dyestuff of the formula

• wherein
• n is 1 or 2
• Z is H, formyl, an alkylcarbonyl, alkylsulphonyl, arylcarbonyl or arylsulphonyl radical, a fiber-reactive radical, or a radical of the formula ##STR118## wherein B is a bridge member, and
• D is ##STR119## wherein R.sup.1 is H, Cl, Br, F or optionally substituted C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 alkoxy, carbalkoxy, sulphonamido, sulphophenylazo or sulphonaphthylazo;
• or carboxyl or --NHZ,
• R.sup.2 is H, Cl, Br, F or optionally substituted C.sub.1 -C.sub.4 -alkyl or C.sub.1 -C.sub.4 alkoxy,
• R.sub.3 is H, Cl, OH, carboxyl or C.sub.1 -C.sub.4 -alkoxy, sulphophenylazo or sulphonaphthylazo,
• R.sub.4 is H, optionally substituted C.sub.1 -C.sub.4 -alkyl or C.sub.1 -C.sub.4 -alkoxy, F, Cl, Br, COOH or SO.sub.3 H,
• R.sub.5 is H, optionally substituted C.sub.1 -C.sub.4 -alkyl or C.sub.1 -C.sub.4 -alkoxy, F, Cl or BR,
• R.sub.6 is H or --NHZ, and
• X is --CH.dbd.CH.sub.2 or --CH.sub.2 CH.sub.2 Y, and
• Y is a radical which can be eliminated under alkaline conditions,
• wherein the optional substituents are Cl, OH, SO.sub.3 H, COOH, SO.sub.2 CH.sub.2 CH.sub.2 OSO.sub.3 H, C.sub.1 -C.sub.4 -alkoxy, phenyl, CN or C.sub.1 -C.sub.4 -alkylcarbonylamino.