Process for the preparation of cationic dyestuffs

Abstract

To prepare dyestuffs of the general formula ##STR1## in which R.sup.1 and R.sup.2 represent methyl or ethyl, n represents 0 or 1, B represents the divalent radical of a 5-membered or 6-membered heterocyclic ring system and X.sup.- represents an anion, and wherein the ring a can be substituted by C.sub.1 - to C.sub.4 -alkyl radicals, C.sub.1 - to C.sub.4 -alkoxy radicals or halogen, compounds of the formula ##STR2## wherein R.sup.1, B and n have the meaning indicated above, m represents 0 or 1 and the ring a can be substituted by C.sub.1 - to C.sub.4 -alkyl, C.sub.1 - to C.sub.4 -alkoxy or halogen, or of the formula ##STR3## in which B and R.sup.1 have the abovementioned meaning and the ring a can be substituted by C.sub.1 - to C.sub.4 -alkyl, C.sub.1 - to C.sub.4 -alkoxy or halogen, are reacted with arylsulphonic acid esters of the formula ##STR4## wherein R represents hydrogen, C.sub.1 - to C.sub.4 -alkyl or halogen and R.sup.2 represents methyl or ethyl, in the presence of water and acid-binding agents at temperatures of 20.degree.-70.degree. C., and, if appropriate, the arylsulphonate anion is replaced by another anion customary in dyestuff chemistry.

Dependencies are inferred from the claim text.