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4-Methylene-1,3-dioxolan-2-ones underwent oxidative addition of a Ni catalyst in the presence of Me Al(OMe), followed by a coupling reaction with alkynes, to form δ,ϵ-unsaturated β-ketocarboxylic acids with high regio- and stereoselectivity. The reaction proceeds by [1,3] rearrangement of an enol metal carbonate intermediate and the formal reinsertion of CO .

4-Methylene-1,3-dioxolan-2-ones underwent oxidative addition of aNi 0 catalyst in the presence of Me 2 Al(OMe), followed by ac oupling reaction with alkynes,t of orm d,eunsaturated b-ketocarboxylic acids with high regio-and stereoselectivity.The reaction proceeds by [1,3] rearrangement of an enol metal carbonate intermediate and the formal reinsertion of CO 2 .

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