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Unsymmetrical, cyclic diborenes and thermal rearrangement to a borylborylene
journal contribution
posted on 2023-06-09, 12:14 authored by Tom E Stennett, James D Mattock, Ivonne Vollert, Alfredo VargasAlfredo Vargas, Holger BraunschweigCyclic diboranes(4) based on a chelating monoanionic benzylphosphine linker were prepared by boron-silicon exchange between arylsilanes and B2Br4. Coordination of Lewis bases to the remaining sp2 boron atom yielded unsymmetrical sp3-sp3 diboranes, which were reduced with KC8 to their corresponding trans-diborenes. These compounds were studied by a combination of spectroscopic methods, X-ray diffraction and DFT calculations. PMe3-stabilized diborene 6 was found to undergo thermal rearrangement to gem-diborene 8. DFT calculations on 8 reveal a polar boron-boron bond, and indicate that the compound is best described as a borylborylene.
History
Publication status
- Published
File Version
- Accepted version
Journal
Angewandte Chemie International EditionISSN
1433-7851Publisher
WileyExternal DOI
Issue
15Volume
57Page range
4098-4102Department affiliated with
- Chemistry Publications
Full text available
- Yes
Peer reviewed?
- Yes