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Intramolecular C(sp<sup>3</sup>)–H Bond Activation Reactions of Low-Valent Cobalt Complexes with Coordination Unsaturation
Intramolecular CÂ(sp<sup>3</sup>)–H bond activation
reactions mediated by low-valent cobalt, both CoÂ(I) and Co(0), have
been observed in the reactions of the three-coordinate cobalt complex
[CoÂ(IMes)<sub>2</sub>Cl] (IMes = 1,3-dimesitylimidazol-2-ylidene)
with alkylation reagents and sodium amalgam. The reactions with alkylation
reagents gave [CoÂ(IMes)Â(IMes′)Â(N<sub>2</sub>)], featuring a
metalated IMes′ anion, whereas the one-electron-reduction reaction
afforded [CoÂ(IMes′)<sub>2</sub>]. The CoÂ(II) complex can react
with CO, isocyanide, and a diazo compound to furnish interesting cobalt
complexes bearing functionalized N-heterocyclic carbene ligands. The
establishment of these conversions demonstrates the capability of
low-valent cobalt with coordination unsaturation to mediate CÂ(sp<sup>3</sup>)–H bond activation and functionalization