The chemistry of fluorinated vinamidinium salts: Reaction of β-polyfluoroalkoxy vinamidinium salts with Grignard reagents

β-Polyfluoroalkoxy vinamidinium salts 1 were allowed to react with a variety of Grignard reagents in tetrahydrofuran at room temperature for 3 h, after an acidic workup of the reaction, to produce the corresponding (Z)-α-polyfluoroalkoxy-α,β-unsaturated aldehydes 2 in good to excellent yields.