Abubakar, Samaila D. Bala, Muhammad Application of Ni(II) complexes of air stable Schiff base functionalized <i>N</i>-heterocyclic carbene ligands as catalysts for the transfer hydrogenation of aliphatic ketones <p>New air stable <i>N</i>-heterocyclic carbene functionalized Schiff base ligands (L) of the type 2-[-2-[3-(R)imidazol-1-yl]ethyliminomethyl]phenol [R = methyl (<b>2</b>), 2-pyridylmethyl (<b>3</b>)] were synthesized and characterized by NMR, IR, MS, and CHN analysis. Single crystal X-ray structural analysis of their Ni(II) complexes revealed square planar arrangement of the chelating ligands coordinated in tridentate (<b>2</b>, C^N^O) and tetradentate (<b>3</b>, N^C^N^O) modes around the metal. The three new isolated and fully characterized complexes were utilized as catalysts for the catalytic transfer hydrogenation of aliphatic ketones in 2-propanol as solvent and source of hydrogen. Based on 0.2 mol% catalyst concentration, the complexes showed activity for aliphatic ketones and 100% conversion (turnover number of 500) for cyclohexanone and all the aromatic ketones tested.</p> Catalytic transfer hydrogenation;aliphatic ketones;N-heterocyclic carbene;nickel complexes;solvent-free;Schiff base 2018-09-19
    https://tandf.figshare.com/articles/journal_contribution/Application_of_Ni_II_complexes_of_air_stable_Schiff_base_functionalized_N-heterocyclic_carbene_ligands_as_catalysts_for_the_transfer_hydrogenation_of_aliphatic_ketones/6729293
10.6084/m9.figshare.6729293.v2