TRANSITION METAL COMPLEXES CORRESPONDING TO THE INSERTION INTO A GROUP IVB ELEMENT-CARBON BOND II. PREPARATION OF MANGANESE COMPLEXES. MECHANISM OF THE DEINSERTION REACTION

Article abstract of DOI:10.1016/0022-328X(84)80163-1

The anions <(η⁵-CH3C5H4)(CO)2(R3M)Mn>^- (M = Si, Ge; R3 = Ph3, (1-C10H7)PhMe) react with alkyl, alkenyl or benzyl halides affording the neutral complexes (η⁵-CH3C5H4)(CO)2(R')(R3M)Mn.These new compounds possess a piano stool geometry with the CO ligands in a diagonal (trans) arrangement.Their thermal reaction with PPh3 leads to the formation of R3MR' (corresponding formally to the deinsertion reaction) and (R3MH (corresponding to the migration of the R' group to the cyclopentadienyl ring).A mechanism for these competitive reactions is proposed.