Protonation of Co(η-C5H4R)(η-C2H4)2, R = Me or Et with tetrafluoroboric acid gives the compounds [Co(η-C5Me4R)(η-C2H4)Et]Bf4, R = Me (1) or Et (2), in which a β-hydrogen of the Co–ethyl group forms a C–H⇀Co bridge via a two-electron, three-centre bond.
M. Brookhart, M. L. H. Green and R. B. A. Pardy, J. Chem. Soc., Chem. Commun., 1983, 691 DOI: 10.1039/C39830000691
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