Triphenylphosphine oxide is used as a catalyst, Lewis base, ligand for metals and starting material for the preparation of other phosphorus compounds. It is also used in epoxidations, Michael reactions and coupling reactions. It reacts with copper(II) halides and form coordination complexes of Copper(II).
Chemical formula    C4H9NO3
Molar mass              119.120 g·mol−1
Density            1.212g/cm^3
Boiling point      154 to 158 °C   
Technical Analysis
Specification        Typical Values
Colour (APHA)        Brown-Pink to White
CAS NO.               791-28-6
Density 1.3±0.1 g/cm3
Solubility           The solubility of TPPO in benzene shows the highest value from (293.32 to 333.77) K