@unpublished{AuerhammerArrowsmithBoehnkeetal.2018, author = {Auerhammer, Dominic and Arrowsmith, Merle and B{\"o}hnke, Julian and Braunschweig, Holger and Dewhurst, Rian D. and Kupfer, Thomas}, title = {Brothers from Another Mother: a Borylene and its Dimer are Non-Interconvertible but Connected through Reactivity}, series = {Chemical Science}, journal = {Chemical Science}, doi = {10.1039/C7SC04789D}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-157125}, year = {2018}, abstract = {The self-stabilizing, tetrameric cyanoborylene [(cAAC)B(CN)]4 (I, cAAC = 1-(2,6-diisopropylphenyl)-3,3,5,5-tetramethylpyrrolidin-2-ylidene) and its diborene relative, [(cAAC)(CN)B=B(CN)(cAAC)] (II), both react with disulfides and diselenides to yield the corresponding cAAC-supported cyanoboron bis(chalcogenides). Furthermore, reactions of I or II with elemental sulfur and selenium in various stoichiometries provided access to a variety of cAAC- stabilized cyanoboron-chalcogen heterocycles, including a unique dithiaborirane, a diboraselenirane, 1,3-dichalcogena-2,4-diboretanes, 1,3,4-trichalcogena- 2,5-diborolanes and a rare six-membered 1,2,4,5-tetrathia-3,6-diborinane. Stepwise addition reactions and solution stability studies provided insights into the mechanism of these reactions and the subtle differences in reactivity observed between I and II.}, language = {en} } @unpublished{BraunschweigBruecknerDeissenbergeretal.2017, author = {Braunschweig, Holger and Br{\"u}ckner, Tobias and Deißenberger, Andrea and Dewhurst, Rian and Gackstatter, Annika and G{\"a}rtner, Annalena and Hofmann, Alexander and Kupfer, Thomas and Prieschl, Dominic and Thiess, Torsten and Wang, Sunewang Rixin}, title = {Reaction of Dihalodiboranes(4) with N-Heterocyclic Silylenes: Facile Construction of 1-Aryl-2-Silyl-1,2-Diboraindanes}, series = {Chemistry, A European Journal}, journal = {Chemistry, A European Journal}, doi = {10.1002/chem.201702377}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-153068}, year = {2017}, abstract = {Dihalodiboranes(4) react with an N-heterocyclic silylene (NHSi) to generate NHSi-adducts of 1-aryl-2-silyl-1,2-diboraindanes as confirmed by X-ray crystallography, featuring the functionalization of both B-X (X = halogen) bonds and a C-H bond under mild conditions. Coordination of a third NHSi to the proposed 1,1-diaryl- 2,2-disilyldiborane(4) intermediates, generated by a two-fold B-X insertion, may be crucial for the C-H borylation that leads to the final products. Notably, our results demonstrate the first C-H borylation with a strong B-F bond activated by silylene insertion.}, language = {en} }