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3-Acetyl-2,3-dihydrobenzothiazoles 11-20 have been prepared by the ring contraction of 2,4diaryl-2,3-dihydro-1,5-benzothiazepines 1-10 under acetylating conditions. Compounds 11,15-24 have been oxidized with isolated dimethyldioxirane (in acetone solution) at ambient temperature to afford 3-acetyl-2,3-dihydrobenzothiazole 1,1-dioxides 25-35 as sole isolable products.doi:10.3998/ark.5550190.0004.503 fatcat:xg5wa76pkzfuvjguofjt7b45re