Used as a chiral ligand in asymmetric catalysis, particularly in transition-metal-catalyzed reactions such as hydrogenation and cross-coupling. Its sterically hindered phosphine group and chiral spirocyclic backbone enhance enantioselectivity, making it valuable in the synthesis of optically active pharmaceuticals and fine chemicals. Commonly coordinates with rhodium, ruthenium, or palladium to form highly efficient catalysts for producing single-enantiomer products.