Diphosphinites ligands, bidentate

Bidentate Diphosphinite, Phosphite-Phosphinite, Diphosphite and Phosphine-Phosphoroamidite Ligands... 

Chiral bidentate ligands such as diphosphinites, diaminophosphines and aminophos-phine-phosphinites, 2 2 have also been used. Although much information has been accumulated the choice of chiral catalysts and reaction conditions still remains empirical, and one must make an effort to find the most suitable catalytic system and reaction conditions for every new substrate. 

Chiral Bidentate and Multidentate Phosphorus Ligands (Diphosphanes and Polyphosphanes, Diphosphites, Diphosphinites, and Diphosphonites). After testing a number of monodentate phosphanes, a real breakthrough came in the area of enantioselective hydrogenation when various types of chiral diphosphanes were applied. The first two diphosphanes employed were DIPAMP and DIOP (see later) introduced by Knowles and Kagan, respectively. Their achievements stimulated research on a variety of bidentate chiral diphosphanes. 

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