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Twisting versus Delocalization in CAAC- and NHC-Stabilized Boron-Based Biradicals: The Roles of Sterics and Electronics

Schmid, Paul, Fantuzzi, Felipe, Klopf, Jonas, Schröder, Niklas B., Dewhurst, Rian D., Braunschweig, Holger, Engel, Volker, Engels, Bernd (2021) Twisting versus Delocalization in CAAC- and NHC-Stabilized Boron-Based Biradicals: The Roles of Sterics and Electronics. Chemistry - A European Journal, 27 (16). pp. 5160-5170. ISSN 0947-6539. E-ISSN 1521-3765. (doi:10.1002/chem.202004619) (KAR id:96297)

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Official URL:
https://doi.org/10.1002/chem.202004619

Abstract

Twisted boron-based biradicals featuring unsaturated C2R2 (R=Et, Me) bridges and stabilization by cyclic (alkyl)(amino)carbenes (CAACs) were recently prepared. These species show remarkable geometrical and electronic differences with respect to their unbridged counterparts. Herein, a thorough computational investigation on the origin of their distinct electrostructural properties is performed. It is shown that steric effects are mostly responsible for the preference for twisted over planar structures. The ground-state multiplicity of the twisted structure is modulated by the σ framework of the bridge, and different R groups lead to distinct multiplicities. In line with the experimental data, a planar structure driven by delocalization effects is observed as global minimum for R=H. The synthetic elusiveness of C2R2-bridged systems featuring N-heterocyclic carbenes (NHCs) was also investigated. These results could contribute to the engineering of novel main group biradicals.

Item Type: Article
DOI/Identification number: 10.1002/chem.202004619
Subjects: Q Science > QD Chemistry
Divisions: Divisions > Division of Natural Sciences > Chemistry and Forensics
Depositing User: Felipe Fantuzzi
Date Deposited: 18 Aug 2022 10:09 UTC
Last Modified: 19 Aug 2022 10:08 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/96297 (The current URI for this page, for reference purposes)
Fantuzzi, Felipe: https://orcid.org/0000-0002-8200-8262
Dewhurst, Rian D.: https://orcid.org/0000-0001-5978-811X
Braunschweig, Holger: https://orcid.org/0000-0001-9264-1726
Engel, Volker: https://orcid.org/0000-0003-1429-1833
Engels, Bernd: https://orcid.org/0000-0003-3057-389X
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