LIGAND SUBSTITUTION AND NUCLEOPHILIC REACTIVITY OF TRICARBONYL(1-3:5,6-η-CYCLOOCTADIENYLIUM)IRON CATION AND ITS DERIVATIVES

Article abstract of DOI:10.1016/S0022-328X(00)98557-7

The tricarbonyl(1-3:5,6-η-cyclooctadienylium)iron cation (I) undergoes attack by triphenylphosphine at two different sites, on the organic group or at the metal; the first type of attack leads to a phosphonium ion and the second case to a dicarbonyl(1-3:5,6-η-cyclooctadienylium)triphenylphosphineiron cation.The two products have been isolated and identified by IR spectroscopy.The reaction between cation I and iodide ion can also involve attack on the organic group or the metal, giving rise to tricarbonyl<4-6-η,1-?-(2-iodocyclooctenyl)>iron and dicarbonyl(1-3:5,6-η-cyclooctadienylium)iodoiron, respectively.Only the latter has been isolated and characterized; for the former indirect evidence is available, involving its reactions with CN^- and PPh3.The reactions between cation I and the various nucleophiles OMe^-, N3^-, CN^-, and AsPh3 and those between its iodo derivative and PPh3 and AsPh3 were also studied.