| 摘要 |
To prepare dyestuffs of the general formula <IMAGE> in which R1 and R2 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- represents an anion, and wherein the ring a can be substituted by C1- to C4-alkyl radicals, C1- to C4-alkoxy radicals or halogen, compounds of the formula <IMAGE> wherein R1, B and n have the meaning indicated above, m represents 0 or 1 and the ring a can be substituted by C1- to C4-alkyl, C1- to C4-alkoxy or halogen, or of the formula <IMAGE> in which B and R1 have the abovementioned meaning and the ring a can be substituted by C1- to C4-alkyl, C1- to C4-alkoxy or halogen, are reacted with arylsulphonic acid esters of the formula <IMAGE> wherein R represents hydrogen, C1- to C4-alkyl or halogen and R2 represents methyl or ethyl, in the presence of water and acid-binding agents at temperatures of 20 DEG -70 DEG C., and, if appropriate, the arylsulphonate anion is replaced by another anion customary in dyestuff chemistry.
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