Instead of undergoing a cyclopentenone annulation, the allylmalonate anion derived from the dicarboxylate (7) rearranges to vinylsuccinate (5), an application of which has led to a convenient synthesis of vinylnaphthoquinones (10).
Meldrum's acids can be allylated by allylic alcohols usingtetrakis[triphenylphosphine]palladium(0) [(PPh 3 ) 4 Pd] as a catalyst in benzene at 80°C without prior activation of allylic hydroxy group.