Used as a phase-transfer catalyst in organic synthesis, facilitating reactions between compounds in different phases by transferring ions into organic solvents. Particularly effective in alkylation, oxidation, and polymerization reactions due to its stable phosphonium cation and lipophilic character. Its tetraphenylborate anion enhances solubility in nonpolar media, making it suitable for catalyzing reactions under mild conditions. Also employed in the preparation of functionalized phosphorus compounds for use in materials science and ligand design.