Ruthenium(II) Complex Catalysts Bearing a Pyridyl-Based Benzimidazolyl鈥揃enzotriazolyl Ligand for Transfer Hydrogenation of Ketones

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• 作者：Wangming Du ; Ping Wu ; Qingfu Wang ; Zhengkun Yu
• 刊名：Organometallics
• 出版年：2013
• 出版时间：May 24, 2013
• 年：2013
• 卷：32
• 期：10
• 页码：3083-3090
• 全文大小：499K
• 年卷期：v.32,no.10(May 24, 2013)
• ISSN：1520-6041

文摘

Air- and moisture-stable ruthenium(II) complexes bearing a unsymmetrical 2-(benzimidazol-2-yl)-6-(benzotriazol-1-yl)pyridine ligand were synthesized and structurally characterized by NMR analysis and X-ray crystallographic determinations. These complexes have exhibited excellent catalytic activity in the transfer hydrogenation of ketones in refluxing 2-propanol, reaching final TOFs up to 176400 h^鈥?. The corresponding RuH complex was isolated and is proposed as the catalytically active species by controlled experiments. The high catalytic activity of the Ru(II) the complex catalysts is attributed to the hemilabile unsymmetrical coordinating environment around the central metal atom in the complexes and presence of a convertible benzimidazolyl NH functionality in the ligand.