Sequential actions of palladium and cobalt nanoparticles immobilized on silica: one-pot synthesis of bicyclic enones by catalytic allylic alkylation and Pauson-Khand reaction.

[reaction: see text] Palladium and cobalt nanoparticles immobilized on silica have been used as catalyst in a sequential allylic alkylation and Pauson-Khand reaction to form bicyclic enones.