Used as a chiral auxiliary in asymmetric synthesis, particularly in enantioselective alkylation reactions. It helps control stereochemistry during carbon-carbon bond formation, especially in the synthesis of complex organic molecules like pharmaceuticals and natural products. Its rigid structure and ability to coordinate with metal enolates make it effective for achieving high enantiomeric excess. Commonly employed in the preparation of β-amino acids and other bioactive compounds where stereochemical purity is critical. After serving its purpose, it can be removed under mild conditions without racemization.