A new selective synthesis of 1,2-benzisothiazol-3-one-1-oxide nitro derivatives by reaction of 2-benzylthio-4-nitro-and 2-benzylthio-4,6-dinitrobenzamides with gaseous chlorine in wet CH 2 Cl 2 has been developed. Reactions of N-unsubstituted 2-benzylthio-4-nitro-and 2-benzylthio-4,6-dinitrobenzamides with gaseous chlorine in 60% AcOH give, instead of the S-oxides, the appropriate 1,2-benzisothiazol-3-one-1,1-dioxide nitro derivatives.
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