Alkane Coordination Selectivity in Hydrocarbon Activation by [Tp‘Rh(CNneopentyl)]: The Role of Alkane Complexes

The competitive activation of C−H bonds of linear, cyclic, and branched hydrocarbons using
the coordinatively unsaturated 16-electron [Tp‘RhL] reactive fragment have been studied (Tp‘ = tris-(3,5-dimethylpyrazolyl)borate; L = CNCH2CMe3). Activation of the hydrocarbons leads to the formation of Tp‘Rh(L)(R)(H) alkyl complexes, which were converted to the stable chlorides immediately following the activation
of the bonds via photolysis of Tp‘Rh(L)(PhNCNCH2CMe3) in the solvent mixture. The products were
analyzed by 1H NMR spectroscopy. The experiments described provide relative rates for the coordination
of primary and secondary C−H bonds to the Rh metal center, indicating a 1.5× preference for the latter.