Stereoelectronic effects in arene exchange of (arene)tricarbonylchromium complexes: Internal arene exchange and internal arene catalysis of external arene exchange

Article abstract of DOI:10.1021/om00154a023

Kinetics of internal and external arene exchanges in benzene as solvent have been studied with tricarbonylchromium complexes of ditolylmethane, ditolylcyclopropane, dimesitylmethane, and dibenzobicyclo[2.2.2]octadienes. These studies define the stereoelectronic requirements for arene exchange and document the stepwise process in which the bonding in the displaced arene proceeds from η⁶ to η⁴ to η². A new intermediate, (arene)₃Cr(CO)₃, is indicated by the catalyzed exchange reactions of some of these compounds.