The methylamino diazonium cations [CH N(H)N ] and [CF N(H)N ] were prepared as their low-temperature stable [AsF ] salts by protonation of azidomethane and azidotrifluoromethane in superacidic systems. They were characterized by NMR and Raman spectroscopy. Unequivocal proof of the protonation site was obtained by the crystal structures of both salts, confirming the formation of alkylamino diazonium ions. The Lewis adducts CH N ⋅AsF and CF N ⋅AsF were also prepared and characterized by low-temperature NMR and Raman spectroscopy, and also by X-ray structure determination for CH N ⋅AsF . Electronic structure calculations were performed to provide additional insights. Attempted electrophilic amination of aromatics such as benzene and toluene with methyl- and trifluoromethylamino diazonium ions were unsuccessful.

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http://dx.doi.org/10.1002/anie.202002750DOI Listing

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