This chiral phosphine oxide is a specialty reagent primarily used as a ligand in asymmetric catalysis for organic synthesis. Featuring a binaphthyl-derived [1,3,2]dioxaphosphepin core with bulky 1-pyrenyl substituents and high enantiomeric purity (>99% e.e.), it enables highly stereoselective reactions, such as enantioselective C-C bond formations or reductions. Its stability and steric properties make it valuable in the preparation of enantiomerically pure intermediates for pharmaceuticals, agrochemicals, and advanced materials, including those for optoelectronics where chirality influences performance.