Butyltriphenyl phosphonium chloride is a quaternary ammonium salt with the chemical formula (C4H9)P(C6H5)3Cl.
features：
Butyltriphenyl phosphonium chloride has a quaternary ammonium structure, consisting of a butyl group (C4H9) attached to a phosphorus atom (P), which is in turn bonded to three phenyl (C6H5) groups. The chloride ion (Cl-) is the counterion.
Application ：
BTPPC is often used as a phase-transfer catalyst. In phase-transfer catalysis, the catalyst facilitates the transfer of reactants between different phases, typically between an aqueous phase and an organic phase. This type of catalysis is valuable in reactions where one reactant is soluble in water and the other in an organic solvent.
