@unpublished{AuerhammerArrowsmithBissingeretal.2017,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}
}
@article{AuerhammerArrowsmithBraunschweigetal.2017,
  author    = {Auerhammer, Dominic and Arrowsmith, Merle and Braunschweig, Holger and Dewhurst, Rian D. and Jim{\´e}nez-Halla, J. Oscar C. and Kupfer, Thomas},
  title     = {Nucleophilic addition and substitution at coordinatively saturated boron by facile 1,2-hydrogen shuttling onto a carbene donor},
  series = {Chemical Science},
  volume    = {8},
  journal   = {Chemical Science},
  number    = {10},
  doi       = {10.1039/c7sc03193a},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-170255},
  pages     = {7066-7071},
  year      = {2017},
  abstract  = {The reaction of [(cAAC\(^{Me}\))BH\(_{3}\)] (cAAC\(^{Me}\) = 1-(2,6-iPr\(_{2}\)C\(_{6}\)H\(_{3}\))-3,3,5,5-tetramethylpyrrolidin-2-ylidene) with a range of organolithium compounds led to the exclusive formation of the corresponding (dihydro)organoborates, Li\(^{+}\)[(cAAC\(^{Me}\)H)BH\(_{2}\)R]- (R = sp\(^{3}\)-, sp\(^{2}\)-, or sp-hybridised organic substituent), by migration of one boron-bound hydrogen atom to the adjacent carbene carbon of the cAAC ligand. A subsequent deprotonation/salt metathesis reaction with Me3SiCl or spontaneous LiH elimination yielded the neutral cAAC-supported mono(organo)boranes, [(cAAC\(^{Me}\)H)BH\(_{2}\)R]- (R]. Similarly the reaction of [cAAC\(^{Me}\))BH\(_{3}\)] with a neutral donor base L resulted in adduct formation by shuttling one boron-bound hydrogen to the cAAC ligand, to generate [(cAAC\(^{Me}\)H)BH\(_{2}\)L], either irreversibly (L = cAAC\(^{Me}\)) or reversibly (L = pyridine). Variable-temperature NMR data and DFT calculations on [(cAAC\(^{Me}\)H)BH\(_{2}\)(cAAC\(^{Me}\))] show that the hydrogen on the former carbene carbon atom exchanges rapidly with the boron-bound hydrides.},
  language  = {en}
}