Used as a phase-transfer catalyst in organic synthesis, facilitating reactions between reagents in different phases by transferring ions into organic solvents. Employed in electrochemistry as a supporting electrolyte due to its high solubility and stability in polar solvents. Also utilized in the preparation of quaternary ammonium-based ionic liquids for specialized industrial processes. Its perchlorate anion makes it useful in certain energetic materials research, though handling requires care due to potential explosivity.