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 selective [2+2+2] cycloaddition of acetylenic hydrocarbons RC![[triple bond, length half m-dash]](https://www.rsc.org/images/entities/char_e007.gif)
CH (R = alkyl, H, or aryl) to norbornadiene.
J. E. Lyons, H. K. Myers and A. Schneider, J. Chem. Soc., Chem. Commun., 1978, 636 DOI: 10.1039/C39780000636
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