Synonyms: Phosphine oxide, 1,2-ethanediylbis[diphenyl-(9CI); Phosphine oxide, ethylenebis[diphenyl- (6CI,7CI,8CI); 1,2-Bis(diphenylphosphino)ethanedioxide; 1,2-Bis(diphenylphosphinyl)ethane;1,2-Ethanediylbis[diphenylphosphine oxide];1,2-Ethylenebis(diphenylphosphine oxide); DPPOE; Ethylenebis(diphenylphosphineoxide); NSC 88641; P,P,P',P'-Tetraphenylethylenediphosphinedioxide