Oxidation of 2‐benzenesulfonylaminoisothiazolium salts 1, 2 and their imines 3, 4 with hydrogen peroxide gave 1,2,3‐thiadiazine 1‐oxides 5, 6, which were converted into the corresponding 1,2,3‐thiadiazine 1,1‐dioxides 7, 8 using m‐chloroperoxybenzoic acid. Oxidation of 5, 6 with hydrogen peroxide furnished isothiazol‐3(2H)‐one 1,1‐dioxides 9, 10 as ring contraction products.

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Investigations of the Cross Reactivity of Isothiazol-3(2H)-one 1,1-Dioxides.-Mono-and bicyclic isothiazolone dioxides (II), (IV), and (VI) are produced by oxidation of the corresponding 3-unsubstituted isothiazoles and their cross reactivity is determined. -(UNTERHALT, B.; LANGFER-MANN, C.; MAJDPOUR, M.; KIRRBACH, S.; KOLBERG, A.; SCHULZE, B.; Pharmazie 53 (1998) 11, 764-766; Inst. Org.