title: Diverse reactions of N-heterocyclic carbenes with an alkynylborane and isolation of a reactive zwitterionic borataallene.
abstract: Ethynyldimesitylborane (1) is synthesised via salt elimination and its reactivity towards NHCs is studied. Depending on their size, NHCs attack either at the boron atom or at the β-alkynyl carbon atom. Steric control over the reaction was probed by reactions with N-heterocyclic carbenes yielding a carbene-borane adduct (2), a 1-boraindane (3), and the first structurally characterised borataallene (4).
authors.affiliation: Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany. h.braunschweig@mail.uni-wuerzburg.de.
authors.forename: Rüdiger
authors.initials: R
authors.lastname: Bertermann
authors.forename: Holger
authors.initials: H
authors.lastname: Braunschweig
authors.forename: Christopher K L
authors.initials: CK
authors.lastname: Brown
authors.forename: Alexander
authors.initials: A
authors.lastname: Damme
authors.forename: Rian D
authors.initials: RD
authors.lastname: Dewhurst
authors.forename: Christian
authors.initials: C
authors.lastname: Hörl
authors.forename: Thomas
authors.initials: T
authors.lastname: Kramer
authors.forename: Ivo
authors.initials: I
authors.lastname: Krummenacher
authors.forename: Bernd
authors.initials: B
authors.lastname: Pfaffinger
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Radacki