Used primarily as a chiral catalyst in asymmetric synthesis, enabling the production of enantiomerically pure compounds. It is especially effective in phase-transfer catalysis, where it facilitates reactions between reagents in different phases, such as aqueous and organic layers. Commonly employed in the synthesis of pharmaceuticals and fine chemicals, it helps achieve high enantioselectivity in alkylation, epoxidation, and Michael addition reactions. Its rigid chiral structure makes it ideal for inducing stereochemical control in complex molecular transformations.