Used as a chiral ligand in asymmetric catalysis, particularly in transition metal-catalyzed reactions such as hydrogenation and cross-coupling. Its phosphine-oxazoline structure provides excellent stereocontrol, making it valuable in the synthesis of enantiomerically pure compounds for pharmaceuticals and fine chemicals. The bulky tert-butyl and diphenyl groups enhance steric and electronic tuning, improving catalytic efficiency and selectivity. Commonly employed with rhodium, palladium, or iridium complexes in asymmetric transformations.