Used as a chiral auxiliary in asymmetric synthesis, particularly in the preparation of enantiomerically pure amines and amino acids. The sulfinyl group provides stereochemical control during nucleophilic addition reactions, allowing selective formation of desired stereoisomers. It is especially valuable in the pharmaceutical industry for synthesizing bioactive molecules where precise stereochemistry is critical. After serving its role, the auxiliary can be cleaved under mild acidic conditions, leaving the target amine intact. Its stability under various reaction conditions and ease of removal make it a preferred choice in multi-step organic syntheses.