Journal of Chemical Sciences

, 121:859 | Cite as

Fluorine effect on pericyclic and pseudopericyclic processes: Evidences and ab initio theory

  • Lakshminarayanan Akilandeswari
  • Madhavan Jaccob
  • Ponnambalam Venuvanalingam
Article

Abstract

Electrocyclic ring opening (ERO) reactions of 2-pyrone, 2-pyranol and pyran and their fluoro compounds (1–6) have been studied at MP2/6-31G(d) level with special emphasis on the influence of fluorine on these pericyclic/pseudopericyclic processes. Calculations clearly predict that substitution of fluorine at C6 favour the reaction both kinetically and thermodynamically. Magnetic susceptibility anisotropy (Δχ aniso), NICS(0), NBO and bond critical property (BCP) analyses clearly illustrate the following; 2-pyrone (1) and 6-fluoro-2-pyrone (2) reactions are pseudopericyclic; 6-fluoro-2-pyranol (reaction 4) corresponds to a borderline case; 2-pyranol (3) and pyran (5) and 6-fluoro pyran (6) reactions are clearly pericyclic in character. Correspondingly pseudeopericyclic reactions show up orbital disconnections and fluorine delays the occurrence of orbital disconnections on the reaction trajectory.

Keywords

Pericyclic reaction pseudeopericyclic reaction fluorine NICS(0) orbital disconnections NBO analysis 

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Copyright information

© Indian Academy of Sciences 2009

Authors and Affiliations

  • Lakshminarayanan Akilandeswari
    • 1
  • Madhavan Jaccob
    • 1
  • Ponnambalam Venuvanalingam
    • 1
  1. 1.School of ChemistryBharathidasan UniversityTiruchirapalliIndia

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