Cycloreversion of acylquadricyclane to acylnorbornadiene promoted by metal oxides

Abstract The very mild, stable, immobilized, and inexpensive metal oxides effectively catalyzed the cycloreversion of methyl 2,4-dimethyl 6,7-diphenyl-5-propionyltetracyclo[3.2.0.0 2,−7 .04,6] heptan-1-carboxylate ( 1 ).