title: Synthesis of Tris(pentafluoroethyl)germanes.
abstract: The synthesis of tris(pentafluoroethyl)germanium derivatives is described. The reaction of germanium tetrachloride with three equivalents of the pentafluoroethylation reagent LiC2F5does not lead selectively to the formation of tris(pentafluoroethyl)chlorogermane, (C2F5)3GeCl. Here the introduction of a diethylamino function as a protecting group was beneficial. Thus, treatment of Cl3GeNEt2with LiC2F5smoothly afforded (C2F5)3GeNEt2. The replacement of the amino substituent by halides was accomplished by reaction with HBr or HCl on a multigram scale. The combination of (C2F5)3GeCl with Ag2CO3gave rise to the formation of the digermoxane [(C2F5)3Ge]2O. An obtuse Ge-O-Ge angle of 150.2(1)° was determined by X-ray diffraction. Attempted hydrolysis of the digermoxane leads to an equilibrium mixture of the precursor, (C2F5)3GeOH, and water.
authors.affiliation: Centrum für Molekulare Materialien, Fakultät für Chemie, Anorganische Chemie, Universität Bielefeld, Universitätsstrasse 25, 33615, Bielefeld, Germany.
authors.forename: Stefanie
authors.initials: S
authors.lastname: Pelzer
authors.affiliation: Centrum für Molekulare Materialien, Fakultät für Chemie, Anorganische Chemie, Universität Bielefeld, Universitätsstrasse 25, 33615, Bielefeld, Germany.
authors.forename: Beate
authors.initials: B
authors.lastname: Neumann
authors.affiliation: Centrum für Molekulare Materialien, Fakultät für Chemie, Anorganische Chemie, Universität Bielefeld, Universitätsstrasse 25, 33615, Bielefeld, Germany.
authors.forename: Hans-Georg
authors.initials: HG
authors.lastname: Stammler
authors.affiliation: Consultant, Merck KGaA, Frankfurter Strasse 250, 64293, Darmstadt, Germany.
authors.forename: Nikolai
authors.initials: N
authors.lastname: Ignat'ev
authors.affiliation: Centrum für Molekulare Materialien, Fakultät für Chemie, Anorganische Chemie, Universität Bielefeld, Universitätsstrasse 25, 33615, Bielefeld, Germany. b.hoge@uni-bielefeld.de.
authors.forename: Berthold
authors.initials: B
authors.lastname: Hoge
keywords: Lewis acids; digermanoxanes; fluorines; germanes; pentafluoroethyl