1,2-Diphenylethylenediamine is primarily used as a chiral ligand in asymmetric synthesis, particularly in catalytic reactions. It plays a crucial role in the production of enantiomerically pure compounds, which are essential in the pharmaceutical industry for developing drugs with specific therapeutic effects. Additionally, it is employed in the synthesis of complex organic molecules, aiding in the creation of fine chemicals and advanced materials. Its ability to induce chirality makes it valuable in research and industrial applications where precise molecular configurations are required.