title: Ruthenium(II) carbonyl complexes bearing CCC-pincer bis-(carbene) ligands: synthesis, structures and activities toward recycle transfer hydrogenation reactions.
abstract: A new series of ruthenium(II) carbonyl complexes with benzene-based CCC-pincer bis-(carbene) ligands, [((R)CCC(R))Ru(CO)2(X)](0/+) and [((R)CCC(R))Ru(CO)(NN)](+) ((R)CCC(R) = 2,6-bis-(1-alkylimidazolylidene)benzene, R = Me or (n)Bu; X = I, Br, CH3CN, or 6-(aminomethyl)pyridine (ampy); NN = 2·CH3CN, or chelating ampy or bipyridine), was synthesized and fully characterized. X-Ray structure determinations revealed that these eight complexes have pseudo-octahedral configurations around the ruthenium center with the pincer ligand occupying three meridional sites. These complexes prove to be efficient precatalysts demonstrating very good activity and reusability for the transfer hydrogenation of ketones.
authors.affiliation: Department of Chemistry, National Dong Hwa University, Hualien 974, Taiwan, ROC. hws@mail.ndhu.edu.tw.
authors.forename: Abbas Raja
authors.initials: AR
authors.lastname: Naziruddin
authors.forename: Zhao-Jiunn
authors.initials: ZJ
authors.lastname: Huang
authors.forename: Wei-Chih
authors.initials: WC
authors.lastname: Lai
authors.forename: Wan-Jung
authors.initials: WJ
authors.lastname: Lin
authors.forename: Wen-Shu
authors.initials: WS
authors.lastname: Hwang