This compound is primarily used in organic synthesis as a phase-transfer catalyst, facilitating reactions between compounds in different phases, such as aqueous and organic layers. It is particularly effective in nucleophilic substitution reactions, where it helps transfer anions into the organic phase, enhancing reaction rates and yields. Additionally, it serves as a precursor for synthesizing other phosphonium salts, which are valuable in various chemical processes, including the preparation of Wittig reagents. These reagents are crucial for forming alkenes from carbonyl compounds, making it a key component in the synthesis of complex organic molecules, including pharmaceuticals and fine chemicals. Its bromine moiety also allows for further functionalization, enabling the creation of diverse chemical structures.