A process for preparing a benzo fused heterocyclic sulfonyl halide comprising reacting a benzo fused heterocyclic compound with an SO.sub.3 complex in the presence of a water immiscible, non-reactive solvent, at a temperature of from about 0.degree. C. to about 75.degree. C., cooling, if necessary, to a temperature of from about -25.degree. C. to about 65.degree. C. and then adding oxalyl halide.
一种制备苯并融合杂环
磺酰卤化物的过程,包括在
水不相溶、非反应性溶剂存在下,将苯并融合
杂环化合物与SO.sub.3复合物反应,反应温度约为0°C至75°C,在必要时降温至约-25°C至65°C,然后加入
草酸卤化物。