Process for the preparation of dyestuffs

A process for the preparation of dyestuffs of the general formula ##STR49## in which D is the radical of a heterocyclic diazo component selected from the group consisting of substituted and unsubstituted, benzo-fused and non-benzo-fused thiazols, isothiazols, thiadiazols, oxazols, imidazols and triazols and

• Z is the radical of a substituted or unsubstituted C.sub.6 -C.sub.10 -arylamino 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 phenylethyl 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 represents C.sub.1 -C.sub.4 -(di)alkylamino, C.sub.6 -C.sub.10 -(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 the above given meaning and
• An.sup..crclbar. represents an anion selected from the series comprising 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 substitutents for the substituted aromatic diazo component, the substituted heterocyclic diazo component, the aryl part of the substituted C.sub.6 -C.sub.10 -arylamino groups in the definition of Z and Z.sub.l, the heterocyclyl part of the heterocyclylimino group, the hetaryl part of the hetarylamino group, or the substituted carbocyclic rings are concerned, being 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 as far as the amino part of the substituted C.sub.6 -C.sub.10 -arylamino group in the definition of Z and Z.sub.1 is concerned, it is unsubstituted or substituted by substituted or unsubstituted C.sub.1 -C.sub.8 -alkyl, C.sub.2 -C.sub.4 -alkylen 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 in the presence of CO.sub.2 at a pressure of 5-100 bar at a temperature of 0.degree.-125.degree. C.