18489
2019
eng
preprint
1
2019-07-23
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--
Synthesis of fused B,N-heterocycles by alkyne cleavage, NHC ring-expansion and C-H activation at a diboryne
The addition of alkynes to a staturated N-heterocyclic carbene (NHC)-supported diboryne results in spontaneous cycloaddition, with complete B≡B and C≡C triple bond cleavage, NHC ring- expansion and activation of a variety of C-H bonds, leading to the formation of complex mixtures of fused B,N-heterocycles.
Chemical Communications
10.1039/C9CC02657F
urn:nbn:de:bvb:20-opus-184899
This is the pre-peer reviewed version of the following article: Chem. Commun., 2019,55, 6700-6703, which has been published in final form at doi:10.1039/C9CC02657F
Chemical Communications, 2019,55, 6700-6703. doi:10.1039/C9CC02657F
669054
false
true
Deutsches Urheberrecht
Tobias Brückner
Merle Arrowsmith
Merlin Heß
Kai Hammond
Marcel Müller
Holger Braunschweig
eng
uncontrolled
heterocycles
eng
uncontrolled
alkynes
eng
uncontrolled
boron
eng
uncontrolled
carbenes
Anorganische Chemie
open_access
Institut für Anorganische Chemie
OpenAIRE
Universität Würzburg
https://opus.bibliothek.uni-wuerzburg.de/files/18489/Braunschweig_Synthesis_fused_B_N-heterocycles_Chem_Comm_2019_submitted_version.pdf
18863
2019
eng
preprint
1
2019-10-11
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Single and Double Hydroboration of B-B Triple Bonds and Conver- gent Routes to a Cationic Tetraborane
A compound with a boron-boron triple bond is shown to undergo stepwise hydroboration reactions with catecholborane to yield an unsymmetrical hydro(boryl)diborene and a 2,3-dihydrotetraborane. Abstraction of H– from the latter compound produces an unusual cationic, planar tetraborane with a hydrogen atom bridging the central B2 moiety. Spectroscopic and crystallographic data and DFT calculations support a ‘protonated diborene’ structure for this compound, which can also be accessed via direct protonation of the corresponding diborene.
Journal of the American Chemical Society
10.1021/jacs.9b07991
urn:nbn:de:bvb:20-opus-188632
This document is the unedited Author’s version of a Submitted Work that was subsequently accepted for publication in Journal of the American Chemical Society, copyright © American Chemical Society after peer review. To access the final edited and published work see https://doi.org/10.1021/jacs.9b07991.
669054
Journal of the American Chemical Society 2019, 141, 37, 14898-14903. doi:10.1021/jacs.9b07991
false
true
Deutsches Urheberrecht
Tobias Brückner
Tom E. Stennett
Merlin Heß
Holger Braunschweig
eng
uncontrolled
boron
eng
uncontrolled
multiple bonding
eng
uncontrolled
hydroboration
Anorganische Chemie
open_access
Institut für Anorganische Chemie
OpenAIRE
Universität Würzburg
https://opus.bibliothek.uni-wuerzburg.de/files/18863/Braunschweig_Diboryne_hydroboration_JACS_submitted_version.pdf
16024
2018
eng
preprint
1
2018-04-06
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--
Isolation of diradical products of twisted double bonds
Molecules containing multiple bonds between atoms—most often in the form of olefins—are ubiquitous in nature, commerce, and science, and as such have a huge impact on everyday life. Given their prominence, over the last few decades, frequent attempts have been made to perturb the structure and reactivity of multiply-bound species through bending and twisting. However, only modest success has been achieved in the quest to completely twist double bonds in order to homolytically cleave the associated π bond. Here, we present the isolation of double-bond-containing species based on boron, as well as their fully twisted diradical congeners, by the incorporation of attached groups with different electronic properties. The compounds comprise a structurally authenticated set of diamagnetic multiply-bound and diradical singly-bound congeners of the same class of compound.
Nature Communications
urn:nbn:de:bvb:20-opus-160248
Submitted version of Julian Böhnke, Theresa Dellermann, Mehmet Ali Celik, Ivo Krummenacher, Rian D. Dewhurst, Serhiy Demeshko, William C. Ewing, Kai Hammond, Merlin Heß, Eckhard Bill, Eileen Welz, Merle I. S. Röhr, Roland Mitrić, Bernd Engels, Franc Meyer & Holger Braunschweig: Isolation of diborenes and their 90°-twisted diradical congeners. Nature Communications. Volume 9, Article number: 1197 (2018) doi:10.1038/s41467-018-02998-3
669054
Nature Communications. Volume 9, Article number: 1197 (2018) doi:10.1038/s41467-018-02998-3
Deutsches Urheberrecht
Julian Böhnke
Theresa Dellermann
Mehmet Ali Celik
Ivo Krummenacher
Rian D. Dewhurst
Serhiy Demeshko
William C. Ewing
Kai Hammond
Merlin Heß
Eckhard Bill
Eileen Welz
Merle I. S. Röhr
Roland Mitric
Bernd Engels
Franc Meyer
Holger Braunschweig
eng
uncontrolled
diradicals
eng
uncontrolled
diborenes
eng
uncontrolled
carbenes
eng
uncontrolled
boron
Anorganische Chemie
open_access
Institut für Anorganische Chemie
Institut für Physikalische und Theoretische Chemie
OpenAIRE
Universität Würzburg
https://opus.bibliothek.uni-wuerzburg.de/files/16024/Braunschweig_Isolation_Diborenes_Nature_Communications_2018_submitted_version.pdf