@unpublished{HermannCidMattocketal.2018, author = {Hermann, Alexander and Cid, Jessica and Mattock, James D. and Dewhurst, Rian D. and Krummenacher, Ivo and Vargas, Alfredo and Ingleson, Michael J. and Braunschweig, Holger}, title = {Diboryldiborenes: π-Conjugated B\(_4\) Chains Isoelectronic to the Butadiene Dication}, series = {Angewandte Chemie, International Edition}, journal = {Angewandte Chemie, International Edition}, doi = {10.1002/anie.201805394}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-167977}, year = {2018}, abstract = {sp\(^2\)-sp\(^3\) diborane species based on bis(catecholato)diboron and N-heterocyclic carbenes (NHCs) are subjected to catechol/bromide exchange selectively at the sp\(^3\) boron atom. The reduction of the resulting 1,1-dibromodiborane adducts led to reductive coupling and isolation of doubly NHC-stabilized 1,2-diboryldiborenes. These compounds are the first examples of molecules exhibiting pelectron delocalization over an all-boron chain.}, language = {en} } @unpublished{HermannArrowsmithTrujilloGonzalezetal.2020, author = {Hermann, Alexander and Arrowsmith, Merle and Trujillo-Gonzalez, Daniel and Jim{\´e}nez-Halla, J. Oscar C. and Vargas, Alfredo and Braunschweig, Holger}, title = {Trapping of a Borirane Intermediate in the Reductive Coupling of an Arylborane to a Diborene}, series = {Journal of the American Chemical Society}, journal = {Journal of the American Chemical Society}, doi = {10.1021/jacs.0c02306}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-203140}, year = {2020}, abstract = {The reductive coupling of an NHC-stabilized aryldibromoborane yields a mixture of trans- and cis-diborenes in which the aryl groups are coplanar with the diborene core. Under dilute reduction conditions two diastereomers of a borirane-borane intermediate are isolated, which upon further reduction give rise to the aforementioned diborene mixture. DFT calculations suggest a mechanism proceeding via nucleophilic attack of a dicoordinate borylene intermediate on the aryl ring and subsequent intramolecular B-B bond formation.}, language = {en} } @article{SchmidtWernerArrowsmithetal.2020, author = {Schmidt, Uwe and Werner, Luis and Arrowsmith, Merle and Deissenberger, Andrea and Hermann, Alexander and Hofmann, Alexander and Ullrich, Stefan and Mattock, James D. and Vargas, Alfredo and Braunschweig, Holger}, title = {Trans-selektive Dihydroborierung eines cis-Diborens durch Insertion: Synthese eines linearen sp\(^3\)-sp\(^2\)-sp\(^3\)-Triborans und anschließende Kationisierung}, series = {Angewandte Chemie}, volume = {132}, journal = {Angewandte Chemie}, number = {1}, doi = {10.1002/ange.201911645}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-219713}, pages = {333-337}, year = {2020}, abstract = {Die Reaktion zwischen Aryl- und Amino(dihydro)boranen und Dibora[2]ferrocenophan 1 f{\"u}hrt zur Bildung von 1,3-trans-Dihydrotriboranen durch formale Hydrierung und Insertion eines Borylens in die B=B Doppelbindung. Die Aryltriboran-Derivate unterliegen einer reversiblen Photoisomerisierung zugunsten eines cis-1,2-μ-H-3-Hydrotriborans, w{\"a}hrend eine Hydridabstraktion zu kationischen Triboranen f{\"u}hrt, welche die ersten doppelt basenstabilisierten B\(_3\)H\(_4\)\(^+\)-Analoga darstellen.}, language = {de} } @article{SchmidtWernerArrowsmithetal.2020, author = {Schmidt, Uwe and Werner, Luis and Arrowsmith, Merle and Deissenberger, Andrea and Hermann, Alexander and Hofmann, Alexander and Ullrich, Stefan and Mattock, James D. and Vargas, Alfredo and Braunschweig, Holger}, title = {trans-Selective Insertional Dihydroboration of a cis-Diborene: Synthesis of Linear sp\(^3\)-sp\(^2\)-sp\(^3\)-Triboranes and Subsequent Cationization}, series = {Angewandte Chemie International Edition}, volume = {59}, journal = {Angewandte Chemie International Edition}, number = {1}, doi = {10.1002/anie.201911645}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-208090}, pages = {325-329}, year = {2020}, abstract = {The reaction of aryl- and amino(dihydro)boranes with dibora[2]ferrocenophane 1 leads to the formation 1,3-trans -dihydrotriboranes by formal hydrogenation and insertion of a borylene unit into the B=B bond. The aryltriborane derivatives undergo reversible photoisomerization to the cis -1,2-μ-H-3-hydrotriboranes, while hydride abstraction affords cationic triboranes, which represent the first doubly base-stabilized B3H4\(^+\) analogues.}, language = {en} } @article{HagspielArrowsmithFantuzzietal.2021, author = {Hagspiel, Stephan and Arrowsmith, Merle and Fantuzzi, Felipe and Vargas, Alfredo and Rempel, Anna and Hermann, Alexander and Br{\"u}ckner, Tobias and Braunschweig, Holger}, title = {Highly colored boron-doped thiazolothiazoles from the reductive dimerization of boron isothiocyanates}, series = {Angewandte Chemie International Edition}, volume = {60}, journal = {Angewandte Chemie International Edition}, number = {12}, doi = {10.1002/anie.202015508}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-256432}, pages = {6446-6450}, year = {2021}, abstract = {Reduction of (CAAC)BBr\(_2\)(NCS) (CAAC=cyclic alkyl(amino)carbene) in the presence of a Lewis base L yields tricoordinate (CAAC)LB(NCS) borylenes which undergo reversible E/Z-isomerization. The same reduction in the absence of L yields deep blue, bis(CAAC)-stabilized, boron-doped, aromatic thiazolothiazoles resulting from the dimerization of dicoordinate (CAAC)B(NCS) borylene intermediates.}, language = {en} }