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Related Experiment Videos

Neutral bishomoaromatic semibullvalenes.

Hai-Shun Wu1, Haijun Jiao, Zhi-Xiang Wang

  • 1Department of Chemistry, Shanxi Normal University, Linfen 041004, China.

Journal of the American Chemical Society
|August 28, 2003
PubMed
Summary

Boron carbonyl group (BCO) substitution in semibullvalene derivatives enhances aromaticity and lowers rearrangement barriers. This substitution also influences electronic states, impacting molecular stability and reactivity.

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Area of Science:

  • Organic Chemistry
  • Computational Chemistry
  • Aromaticity Studies

Background:

  • Semibullvalene and its derivatives are known for their fluxional properties.
  • Boron carbonyl groups (BCO) offer unique electronic and steric properties for molecular modification.

Purpose of the Study:

  • To investigate the impact of BCO substitution on the aromaticity and rearrangement barriers of semibullvalene systems.
  • To explore the electronic properties, including potential low-lying triplet and open-shell singlet states, induced by BCO substitution.

Main Methods:

  • Computational chemistry methods were employed to study BCO-substituted semibullvalenes.
  • Nucleus independent chemical shifts (NICS) were calculated to assess homoaromaticity.

Main Results:

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  • Isolobal substitution of CH units by BCO groups at specific positions (C2,6 and C2,8,4,6) significantly favors delocalized neutral bishomoaromatic systems.
  • Homoaromaticity was confirmed by computed diatropic NICS values.
  • BCO substitution can lead to low-lying triplet and open-shell singlet states.
  • Substitution at C1,5 positions markedly increases the Cope rearrangement barrier, while substitution at C2,6 and C2,8,4,6 positions substantially reduces barriers in related barbaralanes, barbaralones, and bullvalenes.

Conclusions:

  • BCO substitution is a viable strategy to tune the aromaticity and fluxionality of semibullvalene frameworks.
  • The electronic effects of BCO substitution can stabilize aromatic systems and alter reaction pathways.