Benzyltripropylammonium chloride is primarily used as a phase transfer catalyst in organic synthesis. It facilitates the transfer of reactants between immiscible phases, such as aqueous and organic layers, enhancing reaction rates and efficiency. This compound is particularly valuable in nucleophilic substitution reactions, where it helps in the formation of ethers, esters, and other organic derivatives. Additionally, it finds application in the synthesis of pharmaceuticals, agrochemicals, and specialty chemicals, where precise control over reaction conditions is crucial. Its role as a catalyst also extends to polymerization processes, aiding in the production of polymers with specific properties.