The reaction of the bis(pentalene)dititanium complex Ti2(μ:η5,η5-Pn)2 (Pn = C8H4(1,4-SiiPr3)2) with the N-heterocyclic carbene 1,3,4,5-tetramethylimidazol-2-ylidene results in intramolecular C-H activation of one of the iPr methyl groups of a Pn ligand and formation of a "tucked-in" bridging hydride complex. The "tuck-in" process is reversed by the addition of hydrogen, which yields a dihydride featuring terminal and bridging hydrides.
Tsoureas, N., Green, J. C., & Cloke, F. G. N. (2017). C-H and H-H activation at a di-titanium centre. Chemical Communications, 53(98), 13117–13120. https://doi.org/10.1039/c7cc07726b