| 摘要 |
The invention describes a novel single step process for the production of carbinol bases of the formula I <IMAGE> (I) wherein R is the methyl or ethyl group, each R3 independently is a C1-C4 alkyl group and the benzene rings A and/or B can be unsubstituted or substituted, which process comprises alkylating 1 mole of a dye base of the formula II <IMAGE> (II) or the hydrogen salt thereof of the formula IIa <IMAGE> (IIa) wherein R3, A and B are as defined for formula I and X is any anion, in aqueous alkaline medium having a pH value of at least 10, with at least 2 moles of a compound that introduces the radical R. The carbinol bases obtained are valuable intermediates for obtaining in particular cationic compounds containing any anions, especially carboxylic acid anions, most preferably an acetate anion.
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