title: Isolation of a neutral boron-containing radical stabilized by a cyclic (alkyl)(amino)carbene.
abstract: Utilizing a cyclic (alkyl)(amino)carbene (CAAC) as a ligand, neutral CAAC-stabilized radicals containing a boryl functionality could be prepared by reduction of the corresponding haloborane adducts. The radical species with a duryl substituent was fully characterized by single-crystal X-ray structural analysis, EPR spectroscopy, and DFT calculations. Compared to known neutral boryl radicals, the isolated radical species showed larger spin density on the boron atom. Furthermore, the compound that was isolated is extraordinarily stable to high temperatures under inert conditions, both in solution and in the solid state. Electrochemical investigations of the radical suggest the possibility to generate a stable formal boryl anion species.
authors.affiliation: Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg (Germany).
authors.forename: Philipp
authors.initials: P
authors.lastname: Bissinger
authors.forename: Holger
authors.initials: H
authors.lastname: Braunschweig
authors.forename: Alexander
authors.initials: A
authors.lastname: Damme
authors.forename: Ivo
authors.initials: I
authors.lastname: Krummenacher
authors.forename: Ashwini K
authors.initials: AK
authors.lastname: Phukan
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Radacki
authors.forename: Shun
authors.initials: S
authors.lastname: Sugawara
keywords: boron; carbenes; radicals; reduction; structure elucidation