Used as a chiral ligand in asymmetric catalysis, particularly in transition-metal-catalyzed reactions. It plays a key role in enantioselective transformations such as hydrogenation, coupling reactions, and carbon-carbon bond formations. Its rigid quinoxaline backbone and bulky tert-butyl groups enhance stereocontrol, leading to high enantiomeric excess in products. Commonly employed with rhodium, ruthenium, or palladium complexes in pharmaceutical synthesis and fine chemical manufacturing where precise chirality is required.