M. H. Königsmann, E. Lork, I. L. Odinets, V. G. Nenajdenko, N. E. Shevchenko, G.-V. Röschenthaler, “α-Pentafluoroethylated amines: a new synthetic approach”, Mendeleev Commun., 16:3 (2006), 141

Abstract: Pentafluoroethyllithium generated from pentafluoroethane and n-butyl lithium added to selected imines, which were activated using BF₃ etherate, furnished α-pentafluoroethylated amines and, unexpectedly, depending on the stoichiometry of the reactants, bis(pentafluoroethyl)fluoro-N-(isopropyl)diisopropyliminium borate, whose molecular structure was confirmed by X-ray diffraction.

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Olesya Kazakova, Gerd‐Volker Röschenthaler, Efficient Preparations of Fluorine Compounds, 2012, 205
Nikolay E. Shevchenko, Valentine G. Nenajdenko, Gerd-Volker Röschenthaler, “New method of preparation of C2F5Li and its reactions with cyclic imines and lactims: Synthesis of α-pentafluoroethyl proline”, Journal of Fluorine Chemistry, 129:5 (2008), 390
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