Utility of phosphonium-substituted ester enolates as synthetic intermediates. A novel trialkylphosphine-catalyzed [3,3] rearrangement of allylic acrylates

A novel Ireland-type [3,3] rearrangement which utilizes a catalytic amount of a trialkylphosphine with allylic acrylates has been developed as a synthetic entry into α-methylene-γ,δ-unsaturated carboxylic acids