Alkane C−H Activation and Catalysis by an O-Donor Ligated Iridium Complex
作者:Antek G. Wong-Foy、Gaurav Bhalla、Xiang Yang Liu、Roy A. Periana
DOI:10.1021/ja037849a
日期:2003.11.1
The first examples of well-defined, O-donor ligated, late-metal complexes that are competent for alkane C-H activation are reported. These complexes exhibit thermal and protic stability and are efficient catalysts for H/D exchange reactions with alkanes.
Heterolytic CH Activation and Catalysis by an O-Donor Iridium−Hydroxo Complex
作者:William J. Tenn、Kenneth J. H. Young、Jonas Oxgaard、Robert J. Nielsen、William A. Goddard、Roy A. Periana
DOI:10.1021/om060657e
日期:2006.10.1
A well-defined, O-donor ligated iridium hydroxide complex is reported that is competent for benzene CH activation and long-lived catalytic H/D exchange between benzene and water. An inverse dependence of the H/D exchange rate on added pyridine, a kinetic isotope effect (KIE) of 2.65 +/- 0.56 for CH activation with 1,3,5-trideuteriobenzene, a KIE of 1.07 +/- 0.24 with C6H6/C6D6, and DFT calculations are consistent with the CH activation proceeding via rate-determining benzene coordination followed by fast CH cleavage via a sigma-bond-metathesis transition state.