Transition metal catalysis on olefins: Some considerations relative to migratory insertion

Olefin migratory insertion into a metal-hydrogen or a metal-carbon bond is an ubiquitous step in olefin coordination catalysis by transition metal com plexes. When the catalytic system has element(s) of chirality, and when the two carbon atoms of the substrate are not symmetry-related, the nature of the reaction products will be determined by the capacity of the catalytic s ystem for enantioface selection and by the direction of the insertion. Desp ite some progress having been made, good control of this important catalyti c step is far from being realized. Considerations concerning this step are presented with particular reference to the work of the author in the field of hydrocarbonylation and olefin (co)polymerization reactions.