Anhydrous phosphazenium fluorides as sources for extremely reactive fluoride ions in solution.
Several peralkylated polyaminophosphazenium cations were evaluated for the generation of novel anhydrous F- salts. Two of them have been characterized by X-ray analysis and are particularly soluble, even in apolar aprotic solvents like benzene or THF, one of them even at -30 degrees C. Such solutions probably represent the most basic metal-free and stable media known to date. Comparison of these fluorides with known F- sources demonstrates that they are of unprecedented reactivity and selectivity in E2 elimination reactions.
Schwesinger
Reinhard
R
Chemisches Laboratorium, Institut für Organische Chemie und Biochemie der Universität, Freiburg, Albertstrasse 21, 79104 Freiburg, Germany. rschwesi@chemie.uni-freiburg.de
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Reinhard
R
Wenzl
Peter
P
Kossek
Sebastian
S