Nickel-Catalyzed Formation of Fluorine-Containing Ketones via the Selective Cross-Trimerization Reaction of Tetrafluoroethylene, Ethylene, and Aldehydes

In the presence of a catalytic amount of Ni­(cod)2 and IPr (1,3-bis­(2,6-diiso­propyl­phenyl)­imidazol-2-ylidene), a cross-trimerization reaction of tetra­fluoro­ethylene (TFE), ethylene, and aldehydes proceeded in a selective manner to afford a variety of 4,4,5,5-tetrafluoro-1-pentanone derivatives in good to excellent yields. The present system involves a five-membered nickelacycle key intermediate generated via the oxidative cyclization of TFE and ethylene.