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Substituent effects in eight-electron electrocyclic reactions.

Begoña Lecea1, Ana Arrieta, Fernando P Cossío

  • 1Farmazi Fakultatea and Kimika Fakultatea, Universidad del País Vasco-Euskal Herriko Unibertsitatea, P.K. 1072, 20080 San Sebastián-Donostia, Spain.

The Journal of Organic Chemistry
|January 29, 2005
PubMed
Summary

Eight-electron electrocyclic reactions proceed through Möbius aromatic transition structures. Outward substituents are generally favored in these helical conrotatory electrocyclizations, showing high periselectivity.

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Area of Science:

  • Computational Chemistry
  • Organic Reaction Mechanisms
  • Quantum Chemistry

Background:

  • Electrocyclic reactions are fundamental transformations in organic chemistry.
  • Understanding transition state structures is crucial for predicting reaction outcomes.
  • Eight-electron systems present unique mechanistic pathways compared to smaller systems.

Purpose of the Study:

  • To investigate the transition structures of eight-electron electrocyclic reactions.
  • To elucidate the stereochemical preferences and periselectivity of these reactions.
  • To explore the influence of substituents on the reaction pathway and activation energy.

Main Methods:

  • Density Functional Theory (DFT) calculations were employed.
  • Analysis of transition state geometries and electronic properties.

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  • Comparison with known four-electron reaction mechanisms.

    • Main Results:

    • Conrotatory electrocyclization of (3Z,5Z)-octa-1,3,5,7-tetraenes occurs via Möbius aromatic transition structures.
    • These transition structures adopt a helical conformation.
    • The reactions exhibit complete periselectivity, with a general preference for outward substituents over inward ones, regardless of substituent electronic nature.

    Conclusions:

    • Möbius aromaticity governs the transition states of these eight-electron electrocyclic reactions.
    • Substituent effects on activation energy differences do not correlate with Taft resonance parameters, unlike in four-electron systems.
    • The findings provide insights into the stereochemical control and electronic factors governing complex electrocyclic reactions.