The superacid-promoted electrophilic Csp3–H bond activation of aliphaticamines generates superelectrophilic species that can be subsequently fluorinated. Demonstrated by low-temperature in situ NMR experiments, the ammonium–carbenium dications, crucial for this reaction, can also react with C–H bonds opening future synthesis perspectives for this mode of activation.
Selective Synthesis of <i>gem</i>-Chlorofluorinated Nitrogen-Containing Derivatives after Superelectrophilic Activation in Superacid HF/SbF<sub>5</sub>
The first direct selective synthesis of novel gem-chloro-fluorinated nitrogen-containing building blocks in super-acid 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/SbF5 to be postulated.