TY  - JOUR
A1  - Wei, Yuxiang
A1  - Wang, Junyi
A1  - Yang, Weiguang
A1  - Lin, Zhenyang
A1  - Ye, Qing
T1  - Boosting Ring Strain and Lewis Acidity of Borirane: Synthesis, Reactivity and Density Functional Theory Studies of an Uncoordinated Arylborirane Fused to o‐Carborane
JF  - Chemistry – A European Journal
N2  - Among the parent borirane, benzoborirene and ortho‐dicarbadodecaborane‐fused borirane, the latter possesses the highest ring strain and the highest Lewis acidity according to our density functional theory (DFT) studies. The synthesis of this class of compounds is thus considerably challenging. The existing examples require either a strong π‐donating group or an extra ligand for B‐coordination, which nevertheless suppresses or completely turns off the Lewis acidity. The title compound, which possesses both features, not only allows the 1,2‐insertion of P=O, C=O or C≡N to proceed under milder conditions, but also enables the heretofore unknown dearomative 1,4‐insertion of Ar−(C=O)− into a B−C bond. The fusion of strained molecular systems to an o‐carborane cage shows great promise for boosting both the ring strain and acidity.
KW  - borirane
KW  - carborane
KW  - fused boracycles
KW  - Lewis acidity
KW  - ring strain
Y1  - 2023
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-312089
VL  - 29
IS  - 5
ER  - 
TY  - JOUR
A1  - Ramler, Jaqueline
A1  - Fantuzzi, Felipe
A1  - Geist, Felix
A1  - Hanft, Anna
A1  - Braunschweig, Holger
A1  - Engels, Bernd
A1  - Lichtenberg, Crispin
T1  - The dimethylbismuth cation: entry into dative Bi-Bi bonding and unconventional methyl exchange
JF  - Angewandte Chemie International Edition
N2  - The dimethyl bismuth cation, [BiMe\(_2\)(SbF\(_6\))], has been isolated and characterized. Reaction with BiMe\(_3\) allows access to the first compound featuring Bi→Bi donor–acceptor bonding. In solution, dynamic behavior with methyl exchange via an unusual S\(_E\)2 mechanism is observed, underlining the unique properties of bismuth species as soft Lewis acids with the ability to undergo reversible Bi−C bond cleavage.
KW  - inorganic chemistry
KW  - methyl exchange
KW  - bismuth
KW  - cationic species
KW  - electrophilic substitution
KW  - Lewis acidity
Y1  - 2021
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-256543
VL  - 60
ER  -