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 esterifications, deprotections, and elimination reactions. Also utilized in the preparation of quaternary ammonium salts and as a strong base in non-aqueous titrations. Finds application in polymer chemistry for anion-initiated polymerizations. Additionally, used in analytical chemistry for pH adjustment and as a developer in photolithography processes.