This compound is a chiral bis(dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin) ligand based on a 9,9-dimethylxanthene backbone connected to two dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin units with (11bS,11′bS) configuration. It is primarily utilized as a ligand in asymmetric catalysis, enabling high enantioselectivity in metal-catalyzed reactions such as hydrogenations, cross-couplings (e.g., Suzuki-Miyaura, Heck), and allylic substitutions. The rigid xanthene core and bulky binaphthyl-derived phosphorus moieties provide excellent steric control and stability to metal complexes, particularly with palladium, rhodium, and ruthenium, making it suitable for the synthesis of enantiopure pharmaceuticals, agrochemicals, and fine chemicals. Its chiral nature ensures stereoselective outcomes in reactions requiring precise control over molecular asymmetry.