Used as a chiral auxiliary in asymmetric synthesis, enabling the stereocontrolled formation of carbon-carbon and carbon-heteroatom bonds. It is particularly effective in enantioselective alkylation and aldol reactions, where it helps direct the spatial arrangement of molecules to produce a desired enantiomer. After serving its role in controlling stereochemistry, it can be cleaved and recycled, making it valuable in the synthesis of complex organic molecules such as pharmaceuticals and natural products.