The protonation of (cyclohexadiene)(cyclopentadienyl)rhodium(I), has been shown to proceed with metal–hydrogen interaction via a π-allylic cation to yield the endo-substituted product; the stereochemistry of the product has been established by deuteriation, coupled with studies on trityl and hydride ion attack on the diene and dienyl salt, respectively.
B. F. G. Johnson, J. Lewis and D. Yarrow, J. Chem. Soc., Chem. Commun., 1972, 235 DOI: 10.1039/C39720000235
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