Used as a highly selective chiral ligand in asymmetric catalysis, particularly in transition metal-catalyzed reactions such as hydrogenation and C–C bond formation. Its sterically bulky phosphine group and rigid indenofluorene backbone enhance enantioselectivity and catalyst stability. Effective in producing enantiomerically pure pharmaceutical intermediates and fine chemicals. Commonly employed with palladium or iridium complexes in enantioselective transformations.