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Generation of a Doubly Bridging CO2 Ligand and Deoxygenation of CO2 by an (NHC)Ni(0) Complex

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journal contribution
posted on 14.11.2007, 00:00 by Chang Hoon Lee, David S. Laitar, Peter Mueller, Joseph P. Sadighi
The treatment of [(IPr)Ni(μ-Cl)]2 (IPr = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene) with NaOt-Bu and then pinB-Bpin (bis(pinacolato)diboron) gives rise to a mono-NHC−Ni(0) complex, which dimerizes upon crystallization. The same product is prepared by the treatment of [(IPr)Ni(μ-Cl)]2 with Li(BEt)3H, or with NaOt-Bu and then HSi(OEt)3. The treatment of [(IPr)Ni]2 or its monomer with CO2 reduces CO2 to CO generating [(IPr)Ni]2(μ-CO)(μ-η22-CO2). This compound represents an unprecedented symmetric double-bridging mode of CO2.