Process for the preparation of dyestuffs

A process for the preparation of dyestuffs of the formula ##STR49## in which D the radical of a substituted or unsubstituted aromatic diazo component containing 6 to 10 carbon atoms and

• Z is the radical of a substituted or unsubstituted C.sub.6 -C.sub.10 -azylamino group or is the radical of the formula ##STR50## in which Y represents --S--, --O-- or ##STR51## R.sup.17 represents hydrogen, unsubstituted C.sub.1 -C.sub.8 -alkyl or C.sub.1 -C.sub.8 -alkyl which is substituted by hydroxy, halogen, cyano, C.sub.1 -C.sub.4 -alkoxy, carboxyl, C.sub.1 -C.sub.4 -(di)alkylaminocarbonyl, C.sub.1 -C.sub.4 -alkoxycarbonyl or C.sub.1 -C.sub.4 -alkylsulphonyl or represents C.sub.2 -C.sub.4 -alkylen, unsubstituted phenylmethyl, unsubstituted phenyl-ethyl or phenylmethyl or phenylethyl which in each case is substituted by halogen, cyano, C.sub.1 -C.sub.4 -alkyl or C.sub.1 -C.sub.4 -alkoxy,
• R.sup.19 and R.sup.20 either represent hydrogen or together represent the remaining members of a fused benzene ring and
• R.sup.21 represent C.sub.1 -C.sub.4 -(di)alkylamino, C.sub.6 -C.sub.4 -(di)arylamino, C.sub.1 -C.sub.4 -alkyl-C.sub.6 -C.sub.10 -arylamino, morpholino, piperidino, piperazino, pyrrolidino, C.sub.1 -C.sub.4 -alkylmercapto or C.sub.6 -C.sub.10 -arylmercapto,
• in which a diazo component of the formula
• D--NH.sub.2
• and a component of the formula
• H--Z.sub.1
• wherein
• Z.sub.1 is a radical of a substituted or unsubstituted C.sub.6 -C.sub.10 -arylamino group or a radical of the formulae ##STR52## in which Y, R.sup.17, R.sup.19, R.sup.20 and R.sup.21 have be above give meaning and
• An.sup..crclbar. represents an anion selected from the group consisting of Cl.sup..crclbar., CH.sub.3 OSO.sub.2 O.sup..crclbar., I.sup..crclbar., Br.sup..crclbar., CH.sub.3 COO.sup..crclbar.,
• and the substituents for the substituted aromatic diazo component or aryl part of the substituted C.sub.6 -C.sub.10 -arylamino groups in the definition of Z and Z.sub.1 are selected from the group consisting of C.sub.1 -C.sub.4 -alkyl, C.sub.6 -C.sub.10 -aryl, C.sub.1 -C.sub.4 -alkoxy, C.sub.1 -C.sub.4 -alkoxycarbonyl, C.sub.1 -C.sub.4 -alkylcarbonyloxy, cyano, C.sub.1 -C.sub.4 -(di)alkylamino, C.sub.1 -C.sub.4 -(di)alkylaminocarbonyl, C.sub.1 -C.sub.4 -alkylcarbonylamino, hydroxy, halogen, C.sub.1 -C.sub.4 -alkylcarbonyl, C.sub.1 -C.sub.4 -alkylsulphonyl, C.sub.1 -C.sub.4 -(di)alkylaminosulphonyl, C.sub.1 -C.sub.4 -alkylsulphonylamino, C.sub.1 -C.sub.4 -alkoxysulphonyl, C.sub.1 -C.sub.4 -alkylsulphonyloxy, nitro, C.sub.6 -C.sub.10 -(di)arylamino, C.sub.1 -C.sub.4 -alkyl-C.sub.6 -C.sub.10 -arylamino, phenylsulphonyl, phenylazo, benzothiazolyl, 1,2,4-oxadiazolyl, morpholino, piperidino, piperazino, pyrrolidino, C.sub.1 -C.sub.4 -alkylmercapto and C.sub.6 -C.sub.10 -arylmercapto;
• and substituents for the amino part of the substituted C.sub.6 -C.sub.10 -arylamino group in the definition of Z and Z.sub.1 are selected from the group consisting of C.sub.1 -C.sub.8 -alkyl, C.sub.2 -C.sub.4 -alkylene or substituted or unsubstituted C.sub.1 -C.sub.4 -alkyl-C.sub.6 -C.sub.10 -aryl, are reacted in an aqueous medium with a nitrite selected from the group consisting of alkali nitrite, C.sub.1 -C.sub.5 -alkyl nitrite, glycol nitrite or polyol nitrite at a CO.sub.2 pressure of more than 5 bar and at a temperature of 0.degree.-125.degree. C.