Amines, Azides, and Nitro Compounds

Examples of a secondary CF2 group bound to amino nitrogen are rare, with a chemical shift reported only for PhCF2N(CH3)2. 

When a CF2H group is attached to an ammonium nitrogen, its fluorines are considerably shielded relative to the respective amine. Thus, the fluorine chemical shifts of difluoromethyl trialkyl ammonium 

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