@unpublished{AuerhammerArrowsmithBissingeretal.2017,
  author    = {Auerhammer, Dominic and Arrowsmith, Merle and Bissinger, Philipp and Braunschweig, Holger and Dellermann, Theresa and Kupfer, Thomas and Lenczyk, Carsten and Roy, Dipak and Sch{\"a}fer, Marius and Schneider, Christoph},
  title     = {Increasing the Reactivity of Diborenes: Derivatization of NHC- Supported Dithienyldiborenes with Electron-Donor Groups},
  series = {Chemistry, A European Journal},
  journal   = {Chemistry, A European Journal},
  doi       = {10.1002/chem.201704669},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-155419},
  year      = {2017},
  abstract  = {A series of NHC-supported 1,2-dithienyldiborenes was synthesized from the corresponding (dihalo)thienylborane NHC precursors. NMR and UV-vis spectroscopic data, as well as X-ray crystallographic analyses, were used to assess the electronic and steric influences on the B=B double bond of various NHCs and electron-donating substituents on the thienyl ligands. Crystallographic data showed that the degree of coplanarity of the diborene core and thienyl groups is highly dependent on the sterics of the substituents. Furthermore, any increase in the electron- donating ability of the substituents resulted in the destabilization of the HOMO and greater instability of the resulting diborenes.},
  language  = {en}
}
@unpublished{WangArrowsmithBoehnkeetal.2017,
  author    = {Wang, Sunewang R. and Arrowsmith, Merle and B{\"o}hnke, Julian and Braunschweig, Holger and Dellermann, Theresa and Dewhurst, Rian D. and Kelch, Hauke and Krummenacher, Ivo and Mattock, James D. and M{\"u}ssig, Jonas H. and Thiess, Torsten and Vargas, Alfredo and Zhang, Jiji},
  title     = {Engineering a Small HOMO-LUMO Gap and Intramolecular B-B Hydroarylation by Diborene/Anthracene Orbital Intercalation},
  series = {Angewandte Chemie, International Edition},
  volume    = {56},
  journal   = {Angewandte Chemie, International Edition},
  number    = {27},
  doi       = {10.1002/anie.201704063},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-148126},
  pages     = {8009-8013},
  year      = {2017},
  abstract  = {The diborene 1 was synthesized by reduction of a mixture of 1,2-di-9-anthryl-1,2-dibromodiborane(4) (6) and trimethylphosphine with potassium graphite. The X-ray structure of 1 shows the two anthryl rings to be parallel and their π(C\(_{14}\)) systems perpendicular to the diborene π(B=B) system. This twisted conformation allows for intercalation of the relatively high-lying π(B=B) orbital and the low-lying π* orbital of the anthryl moiety with no significant conjugation, resulting in a small HOMO-LUMO gap (HLG) and ultimately an unprecedented anthryl B-B bond hydroarylation. The HLG of 1 was estimated to be 1.57 eV from the onset of the long wavelength band in its UV-vis absorption spectrum (THF, λ\(_{onset}\) = 788 nm). The oxidation of 1 with elemental selenium afforded diboraselenirane 8 in quantitative yield. By oxidative abstraction of one phosphine ligand by another equivalent of elemental selenium, the B-B and C\(^1\)-H bonds of 8 were cleaved to give the cyclic 1,9-diboraanthracene 9.},
  language  = {en}
}