Isomeric transformations of internal perfluorinated. cap alpha. -oxides

The isomeric transformations of the oxides of internal perfluorinated olefins into ketones by the action of alkali-metal fluorides and antimony pentafluoride were studied. The direction of opening of the ..cap alpha..-oxide ring in the unsubstituted perfluorinated olefins in the presence of alkali-metal fluorides is determined largely by steric factors. Opening of the epoxide ring by the action of antimony pentafluoride is equally probable in both possible directions.