Used as a chiral catalyst ligand in asymmetric synthesis, particularly in enantioselective transformations such as hydrogenation and cross-coupling reactions. Its rigid dinaphthyl backbone and phosphorus center provide excellent stereocontrol, making it valuable in pharmaceutical and fine chemical manufacturing where high enantiomeric purity is required. Often employed with transition metals like palladium or rhodium to achieve efficient catalytic performance under mild conditions. The triethylamine salt form enhances solubility and stability during handling and storage.