Olefin replacement on cyclooctatetraeneiron tricarbonyl by neutral ligands

Article abstract of DOI:10.1021/ic50069a036

Kinetic data are reported on reactions of cyclooctatetraeneiron tricarbonyl with tertiary phosphines (L) and 1,2-bis(diphenylphosphino)ethane (L-L) in decalin at various temperatures. The reactions involve replacement of cyclooctatetraene leading to trans-Fe(CO)₃L₂ and cis-Fe(CO)₃(L-L). Reaction rates depend on the nature and concentration of the entering ligand. Results are interpreted in terms of a mechanism consisting of a slow coordination of L on the substrate followed by fast elimination of cyclooctatetraene from the resulting labile intermediate. Activation parameters are discussed to support this mechanism.