Used as a chiral resolving agent in the separation of enantiomers during pharmaceutical synthesis. Its positively charged quaternary ammonium group enhances solubility in aqueous systems, making it suitable for capillary electrophoresis and ion-exchange chromatography. Commonly applied in analytical and preparative scale separations where high enantioselectivity is required. Also employed as a phase-transfer catalyst in asymmetric synthesis, facilitating reactions between reagents in different phases while maintaining stereochemical control.