Triphenylphosphine (English: triphenylphosphine oxide), or triphenylphosphine, triphenylphosphine, is an organic phosphorus compound in the Chemical formula OP (C6H5) 3. The molecular formula is often abbreviated to PH3PO or pph3o,ph to represent C6H5. At room temperature is a white crystal, is the oxidation of triphenylphosphine products, commonly used as a crystallization initiator of compounds.