| 摘要 |
Process for the preparation of benzthiazole dyestuffs by alkylation of compounds of the formula <IMAGE> wherein R1 and R2 denote hydrogen, alkyl, alkenyl, cycloalkyl, aryl or aralkyl, or, conjointly with the N-atom, form a ring, or R1 can be linked to the o-position of the ring B and the rings A and B and the radicals R1 and R2 can contain non-ionic substituents and carbocyclic or heterocyclic rings can be fused to the rings A and B, with esters of the formula R3-SO3R wherein R denotes an alkyl radical and R3 denotes an aryl radical or R-O, in organic solvents and consequently alkylation by the addition of water.
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