6 Lewis Acidic Boranes in Frustrated Lewis Pair Chemistry
225
Fig. 6.21 Reductive etherification of carbonyls with THF acting as solvent and Lewis base
Fig. 6.22 Examples of the reactivity of C 6 Cl 5 -containing boranes
around the boron center (Fig. 6.22b). To gain an insight into its Lewis acidity, Density
Functional Theory was used giving an intermediate value between B(C 6 F 5 ) 3 and
BPh 3 . The slightly less bulky borane B(C 6 F 5 ) 2 (C 6 Cl 5 ) was able to perform hydrogenations under ambient conditions, as any water present could easily be removed by
exposure to high vacuum or the presence of molecular sieves in the reaction mixture
(Fig. 6.22c) [41, 84].
225
Fig. 6.21 Reductive etherification of carbonyls with THF acting as solvent and Lewis base
Fig. 6.22 Examples of the reactivity of C 6 Cl 5 -containing boranes
around the boron center (Fig. 6.22b). To gain an insight into its Lewis acidity, Density
Functional Theory was used giving an intermediate value between B(C 6 F 5 ) 3 and
BPh 3 . The slightly less bulky borane B(C 6 F 5 ) 2 (C 6 Cl 5 ) was able to perform hydrogenations under ambient conditions, as any water present could easily be removed by
exposure to high vacuum or the presence of molecular sieves in the reaction mixture
(Fig. 6.22c) [41, 84].