| 摘要 |
Cationic hydrazone dyestuffs of the general formula <IMAGE> I in which R1 stands for hydrogen, C1-C4-alkyl, C1- to C4-alkoxy, nitro or halogen, R2 stands for hydrogen, C1- to C4-alkyl, C1- to C4-alkoxy, halogen or phenylazo, R3 stands for C1- to C3-alkyl and A- stands for an anion, are prepared by quaternarizing azo bases of the general formula <IMAGE> II wherein R1, R2 and R3 have the abovementioned meaning, with dialkyl sulphates of the general formula (R3-O)2SO2 III in which R3 has the abovementioned meaning, in the presence of water and alkali metal sulphate or alkaline earth metal sulphate and, where appropriate, by replacing the alkylsulphate anion by another anion.
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