[benzylsulfonyl(phenyl)methylidene]-triphenyl-λ⁵-phosphane

[(benzylsulfonyl)(4-methylphenyl)methylene](triphenyl)phosphorane

1,4-Diphenyl-4-triphenylphosphoranylidenebut-1-yn-3-one

ethyl 3-oxo-2-(triphenylphosphoranylidene)octanoate