Diethyl D-(-)-tartrate is widely used as a chiral resolving agent in asymmetric synthesis, particularly in the production of enantiomerically pure compounds. It serves as a key ligand in catalytic systems, such as Sharpless asymmetric epoxidation, where it helps in the selective formation of epoxides from allylic alcohols. This chemical is also employed in the synthesis of pharmaceuticals, agrochemicals, and fine chemicals, where precise stereochemistry is crucial for activity and efficacy. Additionally, it finds applications in the preparation of chiral catalysts and as a solvent or additive in various organic reactions to enhance selectivity and yield.