Unsymmetrical, cyclic diborenes and thermal rearrangement to a borylborylene

Stennett, Tom E, Mattock, James D, Vollert, Ivonne, Vargas, Alfredo and Braunschweig, Holger (2018) Unsymmetrical, cyclic diborenes and thermal rearrangement to a borylborylene. Angewandte Chemie International Edition. ISSN 1433-7851

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Abstract

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.

Item Type: Article
Keywords: boron; borylenes; DFT calculations; multiple bonds; rearrangements
Schools and Departments: School of Life Sciences > Chemistry
Subjects: Q Science > QD Chemistry
Depositing User: Alfredo Vargas
Date Deposited: 14 Mar 2018 10:06
Last Modified: 20 Mar 2018 15:10
URI: http://sro.sussex.ac.uk/id/eprint/73693

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