Tetraphenylphosphonium Bromide
Quaternary phosphonium salt, structurally similar to quaternary ammonium salts, with a phosphorus atom radius larger than nitrogen, resulting in stronger polarization than quaternary ammonium salts. Main applications: Phosphorus ylide precursor for Wittig reactions in the synthesis of fine chemicals, pharmaceuticals, and liquid crystal monomers; curing accelerator for polymer polymerization; phase transfer catalyst in organic synthesis chemistry.

CAS# 2751-90-8
Structural Formula
Molecular Formula C24H20PBr
Molecular Weight 419.29
Physical Properties Purity 99%, off-white solid, melting point 295–300°C. Soluble in alcohol, slightly soluble in water.
Applications ● Phase transfer catalyst in organic synthesis chemistry, suitable for the synthesis of meta-aromatic fluorides.
● Phosphorus ylide precursor for Wittig reactions in the synthesis of fine chemicals, pharmaceuticals, and liquid crystal monomers.
Packaging & Storage 25kg/cardboard drum, 25kg/waterproof kraft bag. Store in a dark, cool, dry, and well-ventilated area.