C–C bond cleavage reactions of episulphones. A convenient new synthesis of thiepin 1,1-dioxide

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Abstract
The reaction of vinyldiazomethane and its derivatives with sulphur dioxide and sulphenes yields dihydrothiepin 1,1-dioxide which are useful precursors to thiepin 1,1-dioxides; the probable intermediacy of divinyl episulphones in these reaction is discussed.