Stereoselective cobalt-catalysed [2 + 2 + 2] cross-addition of norbornadiene and norbornene
Abstract
A cobalt complex, formed by reducing [Co(acac)3](Hacac = acetylacetone) with diethyl-aluminium chloride in the presence of the bidentate ligand bis(1,2-diphenylphosphino)ethane, is an active catalyst for the stereoselective [2 + 2 + 2] cycloaddition of norbornene to norbornadiene.