Used as a chiral ligand in asymmetric catalysis, particularly in transition metal-catalyzed reactions such as hydrogenation, cross-coupling, and hydroformylation. Its rigid backbone and stereogenic centers enable high enantioselectivity, making it valuable in the synthesis of optically active pharmaceuticals and fine chemicals. The phosphorus center coordinates effectively with metals like rhodium, ruthenium, and palladium, enhancing catalytic activity and stereocontrol. Its steric bulk from tert-butyl and ethyl groups helps prevent unwanted side reactions and stabilizes the active catalyst species.