Compounds with a sulfonyl group in general1 and gem-disulfones in particular2 are increasingly attracting attention for their potential in organic synthesis. At the same time, iodonium ylides are being established as a class of ylides of synthetic and mechanistic intere~ t.~ We report the synthesis and chemistry of a new type of iodonium ylide, the carbanion moiety of which is a 6-disulfonyl group, Le., phenyliodonium bis ( ...