A-methylene-8-lactones

Aresta M, Dibenedetto A, Papai I, Schubert G (2002) Unprecedented formal [2-1-2] addition of allene to CO2 promoted by [RhCl(C2H4)(P Pr3)]2 direct synthesis of the four membered lactone a-methylene-p-oxiethanone. The intermediacy of [RhH2Cl(P Pr3)]2 theoretical aspects and experiments, hiorg Chim Acta 334 294-300... 

---