Phosphoniumiodid

synthetischePhosphonium iodide may be prepared by the action of phosphine with dry hydrogen iodide: PH3 + HI → PH4I Solid phosphonium iodide may be produced in the laboratory by slowly and very cautiously adding water to an intimate mixture of white phosphorus and iodine. Also, this phosphorus-iodine mixture may be obtained by mixing solutions in carbon disulfide and carefully evaporating the solvent in a stream of inert gas: P4 + I + H2O → PH4I + H3PO4 2P + I2 + 4H2O → PH4I + H3PO4 + HI Also, the compound can be prepared by hydrolysis of a mixture of diphosphorus tetraiodide and white phosphorus: P2I4 + P + H2O → PH4I + H3PO4.