TY  - INPR
A1  - Braunschweig, Holger
A1  - Krummenacher, Ivo
A1  - Lichtenberg, Crispin
A1  - Mattock, James
A1  - Schäfer, Marius
A1  - Schmidt, Uwe
A1  - Schneider, Christoph
A1  - Steffenhagen, Thomas
A1  - Ullrich, Stefan
A1  - Vargas, Alfredo
T1  - Dibora[2]ferrocenophane: A Carbene-Stabilized Diborene in a Strained cis-Configuration
T2  - Angewandte Chemie, International Edition
N2  - Unsaturated bridges that link the two cyclopentadienyl ligands together in strained ansa metallocenes are rare and limited to carbon-carbon double bonds. The synthesis and isolation of a strained ferrocenophane containing an unsaturated two-boron bridge, isoelectronic with a C=C double bond, was achieved by reduction of a carbene-stabilized 1,1’-bis(dihaloboryl)ferrocene. A combination of spectroscopic and electrochemical measurements as well as density functional theory (DFT) calculations was used to assess the influence of the unprecedented strained cis configuration on the optical and electrochemical properties of the carbene-stabilized diborene unit. Initial reactivity studies show that the dibora[2]ferrocenophane is prone to boron-boron double bond cleavage reactions.
KW  - Boron
KW  - Metallocenes
KW  - Metallocene
KW  - Bor
KW  - Diborane
KW  - density functional calculations
KW  - strained molecules
KW  - diborenes
Y1  - 2016
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-141981
N1  - This is the pre-peer reviewed version of the following article: Angewandte Chemie, International Edition, Volume 56, Issue 3, 889–892, which has been published in final form at doi:10.1002/anie.201609601. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
ER  - 
TY  - JOUR
A1  - Arrowsmith, Merle
A1  - Böhnke, Julian
A1  - Braunschweig, Holger
A1  - Celik, Mehmet
A1  - Dellermann, Theresa
A1  - Hammond, Kai
T1  - Uncatalyzed Hydrogenation of First-Row Main Group Multiple Bonds
JF  - Chemistry, A European Journal
N2  - Room temperature hydrogenation of an SIDep-stabilized diboryne (SIDep = 1,3-bis(diethylphenyl)-4,5-dihydroimidazol-2-ylidene) and a CAAC-supported diboracumulene (CAAC = 1-(2,6- diisopropylphenyl)-3,3,5,5-tetramethylpyrrolidin-2-ylidene) provided the first selective route to the corresponding 1,2-dihydrodiborenes. DFT calculations showed an overall exothermic (ΔG = 19.4 kcal mol\(^{-1}\) two-step asynchronous H\(_2\) addition mechanism proceeding via a bridging hydride.
KW  - diborenes
KW  - carbenes
KW  - hydrogenation
KW  - main-group chemistry
KW  - reaction mechanism
KW  - Diborane
Y1  - 2016
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-139364
N1  - This is the peer reviewed version of the following article: Chemistry, A European Journal, 2016, 22, 17169–17172, which has been published in final form at 10.1002/chem.201604094. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
VL  - 22
IS  - 48
SP  - 17169
EP  - 17172
ER  -