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Organic syntheses with sulfones No. XLII. Oxidation of α-sulfonyl carbanions with cupric salts.

α-Lithiated phenylalkyl sulfones, on treatment with various cupric salts, give comparable amounts of the α,α'-dimer and the corresponding vinylic sulfone.With cupric acetate or propionate, dehydrogenation occurs selectively: primary sulfones are converted into α,β-unsaturated sulfones in high yield.