A Heterobimetallic Rhodium(I)−Ruthenium(II) Catalyst for the Oppenauer-Type Oxidation of Primary and Secondary Alcohols under Mild Conditions

A heterobimetallic complex, in which a RuCl2(acetone)(PPh3)2 fragment is connected via three chloro bridges to a (η4-C4Ph4CO)RhCl fragment, has been identified as a potent catalyst precursor for the Oppenauer-type oxidation of alcohols. With 0.1−0.5 mol % of this complex and K2CO3 as the cocatalyst, it is possible to oxidize secondary and primary alcohols at room temperature using acetone as the solvent and oxidation agent.