Used as a catalyst in organic synthesis, particularly in the Mitsunobu reaction, to convert alcohols into esters, ethers, or other functional groups. Also serves as a ligand in coordination chemistry for transition metal complexes, enhancing catalytic activity in hydrogenation and cross-coupling reactions. Commonly employed in pharmaceutical manufacturing for building complex molecules. Additionally, it acts as a stabilizer in some polymer systems and finds use in electrochemical applications as a phase-transfer catalyst.