Used as a chiral ligand precursor in asymmetric catalysis, particularly in transition metal-catalyzed reactions such as enantioselective hydrogenation and cross-coupling. Its rigid dinaphthyl backbone and phosphorus center with defined stereochemistry make it effective for inducing high enantioselectivity in the synthesis of pharmaceuticals and fine chemicals. Commonly employed in the development of chiral phosphine ligands after modification, it plays a key role in producing single-enantiomer compounds important in drug manufacturing.