(S)-()-1-Phenyl-1,2-ethanediol 2-tosylate is primarily used as a chiral intermediate in organic synthesis. It plays a significant role in the production of enantiomerically pure compounds, which are crucial in the development of pharmaceuticals. This compound is often employed in asymmetric synthesis to create complex molecules with high stereochemical control. It is particularly valuable in the synthesis of chiral alcohols, amines, and other functional groups that are essential in active pharmaceutical ingredients (APIs). Additionally, it is utilized in the preparation of ligands for asymmetric catalysis, enhancing the efficiency and selectivity of catalytic reactions in drug discovery and development.