4,4,4-trifluoro-3-oxo-2-(triphenyl-λ⁵-phosphanylidene)butanenitrile

4,4,5,5,6,6,6-heptafluoro-3-oxo-2-(triphenyl-l⁵-phosphanylidene)hexanenitrile

4,4,5,5,5-pentafluoro-3-oxo-2-(triphenyl-l⁵-phosphanylidene)pentanenitrile

ethyl 2-cyano-2-(triphenyl-λ⁵-phosphanylidene)acetate

3-oxo-3-(3,4,5-trimethoxyphenyl)-2-(triphenyl-l⁵-phosphanylidene)propanenitrile