The indenyl ligand effect on the rate of substitution reactions of Rh(η-C9H7)(CO)2 and Mn(η-C9H7)(CO)3

Abstract

Carbonyl substitution by triphenylphosphine (PPh₃) in the indenyl compounds Rh(η-C₉H₇)(CO)₂ and Mn(η-C₉H₇)(CO)₃ proceeds by a second order rate law which is first order in complex and first order in PPh₃ and in both cases the rates are much faster than for the corresponding cyclopentadienyl complexes; for rhodium a rate enhancement of 10⁸ is found for the indenyl compound over the corresponding cyclopentadienyl compound.