Highly efficient ruthenium-catalyzed Oppenauer-type oxidations of secondary alcohols to ketones have been developed. The catalytic system consists of [(PPh,),RuCl,] (1) and K,CO, or (2) in refluxing acetone. The catalytic reaction is of high efficiency and permits a cata1yst:substrate ratio of 1 : lo00 at 56°C. In some cases the initial turnover rate exceeds 1500 h-'. The reaction was [ (C4Ph4COHOCC4Ph4)(p-H)(CO)4R~z]

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B E L L E R * ( L E I B N I Z -I N S T I T U T F Ü R K A T A L Y S E A N D E R U N IVE R S I T Ä T R O S T O C K , G E R M A NY )Cooperative Transition-Metal and Chiral Brønsted Acid Catalysis: Enantioselective Hydrogenation of Imines to Form Amines Angew. Chem. Int. Ed. 2011, 50, 5120-5124.