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Unsymmetrical, cyclic diborenes and thermal rearrangement to a borylborylene

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posted on 2023-06-09, 12:14 authored by Tom E Stennett, James D Mattock, Ivonne Vollert, Alfredo VargasAlfredo Vargas, Holger Braunschweig
Cyclic 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 Edition

ISSN

1433-7851

Publisher

Wiley

Issue

15

Volume

57

Page range

4098-4102

Department affiliated with

  • Chemistry Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2018-03-14

First Open Access (FOA) Date

2019-03-13

First Compliant Deposit (FCD) Date

2018-03-14

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