Used as a chiral auxiliary in asymmetric synthesis, enabling the formation of stereoselective carbon-carbon and carbon-heteroatom bonds. It is particularly effective in enantioselective alkylation and aldol reactions, where it helps control the spatial arrangement of atoms in the product. After serving its purpose, the auxiliary can be removed under mild conditions, leaving behind the desired chiral intermediate. Commonly employed in the synthesis of complex pharmaceuticals and natural products requiring high enantiomeric purity.