Used as a phase-transfer catalyst in organic synthesis, facilitating reactions between reagents in different phases by transferring ions into organic solvents. Commonly employed in the preparation of ethers, esters, and other fine chemicals. Serves as a strong base in deprotonation reactions and in the generation of carbanions. Widely used in analytical chemistry for titrations and as a mobile phase additive in HPLC. Also applied in electrochemistry and as a reagent in polymerization processes.