| abstract |
Chiral or nonchiral ditertiary diphosphines having solubilizing substituents, for example -NH-C(O)-NH-C(CH2-O-CH2CH2CO2H)3, in the diphosphine framework are excellent ligands for d8 metal complexes which are soluble in polar media, for example water or alcohols, and which can be used as asymmetric or symmetric hydrogenation catalysts for compounds having carbon-carbon or carbon-heteroatom double bonds. |