SYNTHESIS, REACTIVITY, AND SPECTROSCOPIC STUDIES OF η5-C5H5(CO)(L)Fe+ CARBENE COMPLEXES

Article abstract of DOI:10.1016/S0022-328X(00)82939-3

Irradiation of Cp(CO)2Fe⁺ in CH3CN solution with UV light produces high yields of Cp(CO)(CH3CN)Fe⁺; the reaction appears to be general for other Cp(CO)2Fe⁺ complexes.The CH3CN ligand of Cp(CO)(CH3CN)Fe⁺ is readily displaced by other ligands to form Cp(CO)(L)Fe^{+ +} complexes show a general downfield shift of the C(carbene) Resonance as Fe->C(carbene) ?-backbonding is increased by changes in L.Temperature dependent 1H NMR studies of the S-C(carbene) rotational barrier indicate that S -> C(carbene) ?-donation decreases as Fe->C(carbene) ?-backbonding is increased by changing L.The reactivity of these complexes towards primary and secondary amines to form Cp(CO)(L)Fe(CNR)⁺ and Cp(CO)(L)Fe⁺ derivatives also decreases as Fe->C(carbene ?-backbonding is increased by varying L.