The stoichiometric reaction of B(C6F5)3 and NEt2Ph I, at room temperature, in an aromatic solvent, has been investigated by 1D and 2D NMR spectroscopy (1H, 11B, 13C, 15N and 19F). No Et2PhN·B(C6F5)3 adduct was observed. An equilibrium between free B(C6F5)3, NEt2Ph, [HB(C6F5)3]-(HNEt2Ph) + and two zwitterionic stereoisomers (E)- and (Z)-[EtPhN+=CH-CH2-B-(C6 F5)3] (30%) in an E/Z ratio of 3:2 was observed. Whatever the protic reagent Z-OH [Z = H, SiPh3, (c-C5H9)7O12Si8, or silanol group of silica], all the equilibria involved in solutions of I are quantitatively displaced towards the ionic form [Z-O-B(C6F5)3]-(HNEt2 Ph)+. In the case of dimethylaniline, besides free B(C6F5)3 and Me2NPh, the 1:1 adduct (C6F5)3B·NMe2Ph and an iminium salt [PhCH3N= CH2]+[HB(C6F5)3] - have been identified.
|Original language||English (US)|
|Number of pages||8|
|Journal||European Journal of Inorganic Chemistry|
|State||Published - Dec 1 2002|
- NMR spectroscopy
ASJC Scopus subject areas
- Inorganic Chemistry