title: Tris(pentafluoroethyl)germane: Deprotonation and Hydrogermylation Reactions.
abstract: Owing to the highly electron-withdrawing C2F5groups, the tris(pentafluoroethyl)germane (C2F5)3GeH represents an interesting Brønsted acidic compound. The germane is accessible by the treatment of the corresponding halogenogermanes (C2F5)3GeX (X=Cl, Br) with Bu3SnH. After clarifying its molecular structure in the solid state by X-ray diffraction, the acidity of (C2F5)3GeH was examined by treatment with different bases, for example, 1,8-bis(dimethylamino)naphthalene. The resulting germanate(II) ion [Ge(C2F5)3]-serves as a germyl group transfer reagent. The reaction with main-group and transition-metal complexes or organohalides opens access to a variety of different compounds, the structures of which were mostly determined by X-ray diffraction. The corresponding tricarbonylnickelate(0) complex [(CO)3NiGe(C2F5)3]-also gives information about the π-acceptor properties of the [Ge(C2F5)3]-ligand. Furthermore, hydrogermylation reactions of (C2F5)3GeH with alkynes afforded different stereoisomers (α,β-cis, β-trans) depending on the respective reaction conditions and substrates.
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 Str. 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.
authors.forename: Berthold
authors.initials: B
authors.lastname: Hoge
keywords: Tolman electronic parameter; fluorine; germane; pentafluoroethyl; transition-metal complexes