Widely used as a chiral ligand in asymmetric catalysis, this compound plays a key role in enantioselective transformations such as hydrogenation and cross-coupling reactions. Its rigid xanthene backbone and stereodefined sulfinamide group enhance stereocontrol, making it valuable in the synthesis of chiral pharmaceuticals and fine chemicals. It is particularly effective in rhodium- and ruthenium-catalyzed asymmetric hydrogenations, where high enantiomeric excess is required. The phosphine moiety coordinates strongly to transition metals, while the chiral environment around the metal center directs selective bond formation. Due to its air stability and ease of handling, it is preferred in industrial and academic settings for scalable asymmetric processes.