Auerhammer Dominic, Arrowsmith Merle, Bissinger Philipp, Braunschweig Holger, Dellermann Theresa, Kupfer Thomas, Lenczyk Carsten, Roy Dipak K, Schäfer Marius, Schneider Christoph
Institut für Anorganische Chemie, Julius-Maximilians Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.
Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.
Chemistry. 2018 Jan 2;24(1):266-273. doi: 10.1002/chem.201704669. Epub 2017 Dec 5.
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.
