Abstract The synthesis of two series of diastereomeric oxo-and oxy-substituted diphosphanes 7a− 9a and 7b− 9b, as well as an analogous nonfunctionalized diphosphane 17, was performed starting from (R)-camphor. The new diphosphanes were used as ligands in the enantioselective rhodium (I)-catalyzed hydrogenation of functionalized olefins− α-and β-dehydroamino acids and their esters− in order to elucidate the effect of the oxo-and oxy- ...
