1-(1,1-Diphenyl-3-diethylaminopropyl)diphenylphosphine oxide hydrochloride 51749-94-1 Phosphine oxide, diphenyl((1,1-diphenyl-3-diethylamino)propyl)-, hydrochloride Phosphine oxide, diphenyl((alpha-phenyl-alpha-((2-diethylamino)ethyl))benzyl)-hydrochloride