title: Using Ylide Functionalization to Stabilize Boron Cations.
abstract: The metalated ylide YNa [Y=(Ph3PCSO2Tol)-] was employed as X,L-donor ligand for the preparation of a series of boron cations. Treatment of the bis-ylide functionalized borane Y2BH with different trityl salts or B(C6F5)3for hydride abstraction readily results in the formation of the bis-ylide functionalized boron cation [Y-B-Y]+(2). The high donor capacity of the ylide ligands allowed the isolation of the cationic species and its characterization in solution as well as in solid state. DFT calculations demonstrate that the cation is efficiently stabilized through electrostatic effects as well as π-donation from the ylide ligands, which results in its high stability. Despite the high stability of 2 [Y-B-Y]+serves as viable source for the preparation of further borenium cations of type Y2B+←LB by addition of Lewis bases such as amines and amides. Primary and secondary amines react to tris(amino)boranes via N-H activation across the B-C bond.
authors.affiliation: Chair of Inorganic Chemistry II, Faculty of Chemistry and Biochemistry, Ruhr University Bochum, Universitätsstraße 150, 44780, Bochum, Germany.
authors.forename: Thorsten
authors.initials: T
authors.lastname: Scherpf
authors.affiliation: Chair of Inorganic Chemistry II, Faculty of Chemistry and Biochemistry, Ruhr University Bochum, Universitätsstraße 150, 44780, Bochum, Germany.
authors.forename: Kai-Stephan
authors.initials: KS
authors.lastname: Feichtner
authors.affiliation: Chair of Inorganic Chemistry II, Faculty of Chemistry and Biochemistry, Ruhr University Bochum, Universitätsstraße 150, 44780, Bochum, Germany.
authors.forename: Viktoria H
authors.identifier: 0000-0001-6557-2366
authors.initials: VH
authors.lastname: Gessner
keywords: Lewis acid base pairs; boron; boron cations; carbanions; ylide ligands