New ligands with a bidentate bipyridyl (bpy) and a tetradentate bispidine (bisp) subunit (bipyridyl = 2,2Ј-bipyridine derivative, bispidine = 3,7-diazabicyclo[3.

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Reaction of [Os(Hbiim) 2 (O=PPh 3 ) 2 ](NO 3 ) (H 2 biim = 2,2Ј-biimidazole) with [RhCl(cod)] 2 (cod = 1,5-cyclooctadiene) or [Rh(OH)(cod)] 2 yields biimidazolato-bridged trinuclear Rh IOs III -Rh I complexes, which are highly efficient catalysts for the homogeneous hydrogenation of 1-hexene and cyclohexene. The reactivity of the trinuclear compounds compared with the mononuclear subunits indicates that this is due to

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