Used as a chiral auxiliary in asymmetric synthesis, enabling the selective formation of stereocenters in complex organic molecules. It is particularly effective in enantioselective alkylation and aldol reactions, where it controls the spatial arrangement of atoms during bond formation. Its rigid cyclic structure and ability to coordinate with metal ions enhance stereoselectivity. After serving its purpose, it can be cleaved under mild conditions, leaving the desired chiral product intact. Widely applied in the synthesis of pharmaceuticals and natural products requiring high optical purity.