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Updated: May 1, 2026

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Published on: January 19, 2016
Synthesis of tris- and tetrakis(pentafluoroethyl)silanes
Simon Steinhauer1, Julia Bader, Hans-Georg Stammler
1Fakultät für Chemie, Universität Bielefeld, Universitätsstrasse 25, 33615 Bielefeld (Germany).
Abstract:
The synthesis and complete characterization of functional, highly Lewis acidic tris(pentafluoroethyl)silanes as well as tetrakis(perfluoroalkyl)silanes Si(C2F5)4 and Si(C2F5)3 CF3 by direct fluorination is described. The reaction of SiCl4 with LiC2F5 invariably affords (pentafluoroethyl)fluorosilicates. To avoid silicate formation by fluoride transfer from LiC2F5 the Lewis acidity of the silane has to be decreased by electron-donating substituents, such as dialkylamino groups. The easily accessible Si(C2F5)3 NEt2 is a valuable precursor for a series of tris(pentafluoroethyl)silanes.
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