Novel β-polyfluoroalkoxy vinamidinium salts 3 and/or 4 were synthesized in good yields by the reaction of N-(2- polyfluoroalkoxy-3 ,3-difluoro-1-propenyI)trimethylammonium iodides (2), prepared from N-(2,3,3-trifluoro-1-propenyl)trimethylammonium iodide (1), with secondary amines in MeCN at 70 °C for 1 h. The salts were also obtainable in comparable yields by the one-pot reaction of 1 with sodium polyfluoroalkoxide followed by treatment with amines.
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Kase, Koichiro, Mitsuyoshi Katayama, Takashi Ishihara, Hiroki Yamanaka, and John T. Gupton. "Efficient and General Synthesis of Novel β-Polyfluoroalkoxy Vinamidinium Salts." Chemistry Letters, 1997, 893-894. doi:10.1246/cl.1997.893.