C. Claver et al., Biarylphosphonites: a class of monodentate phosphorus(III) ligands that outperform their chelating analogues in asymmetric hydrogenation catalysis, CHEM COMMUN, (11), 2000, pp. 961-962
Rhodium(I) complexes of monodentate phosphonites derived from 2,2'-binaphth
ol and 9,9'-biphenanthrol are compared with diphosphonite chelate analogues
as catalysts for asymmetric hydrogenation; the high ee's (up to 92%) obtai
ned with the monodentate systems and the observation that they are sometime
s superior to the chelate analogues are discussed.