Ethyltriphenylphosphonium iodide is involved in synthesis of diarylmethine derivatives, phosphonium salts, and bismuth(III) polynuclear halide complexes, asymmetric hydrogenation.Ethyltriphenylphosphonium iodide is used as a Wittig reagent and phase transfer catalyst in organic synthesis. It can also be used in asymmetric hydrogenation and to make Bismuth(III) polynuclear complexes.