Lutidine-derived Ru-CNC hydrogenation pincer catalysts with versatile coordination properties
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Publication date
2014-01-01
Authors
Filonenko, Georgy A.
Cosimi, Elena
Lefort, Laurent
Conley, Matthew P.
Copéret, Christophe
Lutz, Martin
Hensen, Emiel J M
Pidko, Evgeny A.
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Abstract
Lutidine-derived bis-N-heterocyclic carbene (NHC) ruthenium CNC-pincer complexes (Ru-CNC's) were prepared. Depending on the synthetic procedure, normal (1, 2) or mixed normal/abnormal NHC-complexes (3) are formed. In the presence of phosphazene base, Ru-CNC complexes activate nitriles to give ketimino compounds 4-6. Nitrile adduct 4 shows reactivity toward strong bases to yield dearomatized complex 7, which heterolytically activates H2 to form the bis-hydrido complex 8. Finally, these Ru-CNC's are active in catalytic hydrogenation of CO2 to formate salts, and unlike the phosphine-containing Ru-PNP counterpart, they also catalyze the selective hydrogenation of esters to alcohols.
Keywords
hydrogenation, metal-ligand cooperation, N-heterocyclic carbene, nitrile activation, ruthenium, Catalysis
Citation
Filonenko, G A, Cosimi, E, Lefort, L, Conley, M P, Copéret, C, Lutz, M, Hensen, E J M & Pidko, E A 2014, 'Lutidine-derived Ru-CNC hydrogenation pincer catalysts with versatile coordination properties', ACS Catalysis, vol. 4, no. 8, pp. 2667-2671. https://doi.org/10.1021/cs500720y