Used as a chiral ligand in asymmetric catalysis, particularly in transition-metal-catalyzed reactions such as hydrogenation and cross-coupling. Its phosphorus-containing heterocyclic structure with defined stereochemistry enables high enantioselectivity in the synthesis of pharmaceutical intermediates and fine chemicals. Commonly employed in palladium and rhodium complexes to facilitate the formation of chiral centers in active pharmaceutical ingredients (APIs). Valued for its stability under reaction conditions and ability to direct stereochemical outcomes in complex organic transformations.