Kinetic hydricity of transition-metal hydrides toward trityl cation

Article abstract of DOI:10.1021/om00009a001

The kinetics of hydride transfer from a series of metal hydrides (MH) to Ph₃C⁺BF₄^- (producing Ph₃-CH and M - FBF₃) have been studied by stopped-flow methods in CH₂Cl₃ solution. Second-order rate constants at 25°C span 5 orders of magnitude in kinetic hydricity, ranging from k = 5.0 × 10¹M^-1 s^-1 for HMn-(CO)₅ to k = 4.6 × 10⁵ M^-1 s^-1 for trans-HMo(CO)₂-(PMe₃)Cp.