A fluoride-ion-induced rearrangement of a perfluorinated alkene perflu
oro-4,4-dimethylpent-2-ene proceeds by migration of trifluoromethyl, g
iving perfluoro-2,4-dimethylpent-2-ene. It has been demonstrated that
this rearrangement involves intermolecular transfer of trifluoromethyl
as an anion.