Mechanisms of Arene Exchange in (Arene)tricarbonylchromium Compounds: Intermolecular and Intramolecular Exchanges in Complexes of Propenylbenzene, Stilbenes, and 1,1-Diphenylethylene

Article abstract of DOI:10.1021/ja00282a023

Kinetic studies of arene exchange of (trans-propenylbenzene)tricarbonylchromium with benzene reveal intramolecular and intermolecular participation by the propenyl substituent.Intramolecular participation via direct bonding of Cr(CO)3 to the alkene portion of the ligand is supported by the observed "internal" exchange in Cr(CO)3 complexes of the three isomers of diphenylethene.The magnitudes of the internal exchange rate constants and the effect of added donor catalysts on internal exchange indicate that the geometry of the unsaturated hydrocarbon influences the movement of Cr(CO)3 along ? systems.