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A boron-pendant ruthenium species forms a unique agostic methyl bridge between the boron and ruthenium atoms in the presence of a ligating solvent, acetonitrile. NMR inversion-recovery experiments enabled the activation and equilibrium thermochemistry for formation of the agostic bridge to be measured. The mechanism for bridge formation involves displacement of an acetonitrile ligand; thus, this is a rare example of a case where an agostic C-H ligand competitively displaces another tightly binding ligand from a coordinatively saturated complex. Characterization of this complex gives unique insights into the development of C-H activation catalysis based on this ligand-metal bifunctional motif.

Thermochemistry and Molecular Structure of a Remarkable Agostic Interaction in a Heterobifunctional Ruthenium−Boron Complex