| 摘要 |
A process for the preparation of a 3-hydrazino-1, 2-benzisothiazole 1,1-dioxide of the formula <IMAGE> in which R1 and R2 each independently is hydrogen, alkyl, halogen, amino, hydroxyl or carboxyl, and R3 and R4 each independently is hydrogen, alkyl, cycloalkyl or aryl, comprising reacting a 3-keto-2H,3H-1,2-benzisothiazole 1,1-dioxide of the formula <IMAGE> with a hydrazine of the formula <IMAGE> in a molar ratio of 1:1 to 1:50, in an inert solvent, at a temperature between 75 DEG C. and 200 DEG C. and for a reaction time of 15 to 40 hours. The products, some of which are known, are fungicidally active and can also be used as intermediates.
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