Synthesis of cycloheptenyldiphenylphosphine oxides from the reactions of a cyclic phosphonium salt with α,β-unsaturated carbonyl compounds

Abstract
The reactions of the ylide from the five-membered cyclic phosphonium salt 1 with methyl vinyl ketone, chalcone, and benzylidene acetone afforded cycloheptenyldiphenylphosphine oxides via a Michael-type reaction followed by an intramolecular Wittig reaction.

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