2‐(Pyridinium‐1‐yl)‐1,1‐bis(perfluoroalkylsulfonyl)ethan‐1‐ide: A Practical Reagent for Synthesis of Strongly Acidic 1,1‐Bis(perfluoroalkylsulfonyl)alkanes

On mixing (RfSO2)2CH2 (Rf=perfluoroalkyl), paraformaldehyde, and substituted pyridines, a three‐component reaction proceeded smoothly to give unusual zwitterions bearing both pyridinium and stabilized carbanion moieties in good to excellent yields. Of these, 2‐fluoropyridinium derivatives rapidly di...

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