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.
L. A. Paquette and S. Maiorana, J. Chem. Soc. D, 1971, 313 DOI: 10.1039/C29710000313
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