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β-Sulfonium carbanions,as a member of organosulfur family,are ephemeral intermediates and difficult to be applied in organic synthesis.We developed a new strategy to relatively stable β-sulfonium carbanions,achieved by an intramolecular addition of a sulfur atom of sulfide to the in situ generated electron-deficlent allene moiety.These kinds of applicable β-sulfonium carbanions may imply an unexplored area,in which a bundle of synthetically useful building blocks are underground.