Selective Synthesis of gem-Chlorofluorinated Nitrogen-Containing Derivatives after Superelectrophilic Activation in Superacid HF/SbF5

The first direct selective synthesis of novel gem-chlorofluorinated nitrogen-containing building blocks in superacid is reported. The dramatic role of the chlorine atom on the reaction is shown by in situ NMR experiments and allows the involvement of a novel original superelectrophilic activation process in superacid HF/SbF(5) to be postulated.