Used as a chiral ligand in asymmetric catalysis, particularly in transition-metal-catalyzed reactions such as asymmetric hydrogenation and cross-coupling. Its rigid dinaphthyl backbone and phosphorus center provide high stereocontrol, making it valuable in the synthesis of enantiomerically pure pharmaceuticals and fine chemicals. Commonly employed in palladium- and rhodium-based catalytic systems to achieve high enantioselectivity. Also applied in the development of novel catalysts for industrial-scale asymmetric transformations.