Protonation d'imines et d'enamines α-CF3: acces a des sels d'enamonium stables

Article abstract of DOI:10.1016/S0022-1139(00)80207-9

Protonation of trifluoromethylated imines and trifluoromethylated tertiary enamines has been observed by NMR spectroscopy and leads in both cases to only a mixture of the two enamonium salts, which were thermodynamically more stable than the corresponding iminium salt.Further neutralisation of the enamonium salts to the corresponding enolisable imines provides stable secondary enamines, despite a lack of any conjugating substituent.