A new iridium catalyst containing an imine–diphosphine ligand has been developed, which showed high efficiency for the hydrogenation of CO2 to formate (yield up to 99%, TON up to 450 000). A possible catalytic mechanism is proposed, in which the imine group of the catalyst plays a key role in the cleavage of H2 and the activation of CO2.
C. Liu, J. Xie, G. Tian, W. Li and Q. Zhou, Chem. Sci., 2015, 6, 2928 DOI: 10.1039/C5SC00248F
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