• Perfluoroalkyl carboxylate esters undergo Wittig reactions with phosphorus ylides, leading to 1-perfluoroalkyl enol ethers, which are useful precursors of various fluorinated derivatives: J. Org. Chem., 57, 3807 (1992); Org. Synth., 75, 153 (1997). See Ethyl trifluoroacetate, A11520, for reaction scheme.