Chemistry of Heterocyclic Compounds

, Volume 51, Issue 3, pp 246–249 | Cite as

A theoretical study of annular tautomerism of pyrrolotetrazoles in the gas phase

  • Vadim Yu. Zubarev
  • Rostislav E. Trifonov
  • Vladimir A. Ostrovskii
  • Dietrich Moderhack
Article

The structure and tautomerism of pyrrolotetrazoles have been studied with quantum-chemical methods (HF/6-31G** and DFT B3LYP/ANO-S) in the gas phase. According to the calculations of the total energies of various prototropic forms of these heterocyclic systems (1Н-, 3Н-, 5Н- and 7Н-tautomers), it was shown that for unsubstituted pyrrolotetrazole and its derivatives containing methyl substituents at the carbon atom(s), the most stable form is the 5Н-tautomer where aromaticity of the tetrazole fragment is maintained. On the contrary, for pyrrolotetrazoles with electron-withdrawing substituents (CN or Cl), the most stable form is the 1Н-tautomer, where the pyrrole fragment is aromatic. This effect may be determined by the differences of the relative electron accepting of the heterocyclic half-rings.

Keywords

pyrrolotetrazoles aromaticity HF and DFT calculations tautomerism total energies 

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Vadim Yu. Zubarev
    • 1
  • Rostislav E. Trifonov
    • 2
  • Vladimir A. Ostrovskii
    • 1
  • Dietrich Moderhack
    • 3
  1. 1.Saint Petersburg State Technological Institute (Technical University)Saint PetersburgRussia
  2. 2.Saint Petersburg State University, Institute of ChemistrySaint PetersburgRussia
  3. 3.Institute of Medicinal and Pharmaceutical ChemistryTechnical UniversityBraunschweigGermany

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