Used as a phase transfer catalyst in organic synthesis, facilitating reactions between compounds in different phases by transferring ions into organic solvents. Commonly employed in the preparation of quaternary ammonium salts and in alkylation reactions. Also utilized in electrochemistry as a supporting electrolyte due to its high solubility and stability in polar solvents. Plays a role in surface treatment processes and in the synthesis of porous materials like zeolites, where it acts as a structure-directing agent.