Fluorinated sterols. Part I. 26,26,26,27,27,27-Hexafluorodesmosterol

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Abstract
The synthesis of hexaflourodesmosrerol (VIII) by a witting condensation between a sterodial triphenylphonium ylide and hexafluoroacetone is described. The 24,25 double bond structure (VIII) is resistant to hydrigenation over palladium and to hydroboration.