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Monatshefte für Chemie - Chemical Monthly

, Volume 149, Issue 11, pp 1971–1978 | Cite as

Substitution effects on 1,3-disubstituted imidazol-2-ylidenes and 1,3-diarylimidazol-2-ylidenes revisited: a theoretical study at DFT level

  • Azam Shiri
  • Ahmad Khorramabadi-zad
  • Zahra Siahpur
Original Paper
  • 91 Downloads

Abstract

Effect of substituents on philicity and stability of 1,3-disubstituted imidazol-2-ylidenes and 1,3-diarylimidazol-2-ylidenes was assessed using the following calculations: adiabatic electron affinity and adiabatic ionization potential, global electrophilicity and differential orbital energy scales for philicity, and ΔES–T, ΔEHyd, ΔEiso, and ΔEH–L for stability, with the aid of density functional theory and the results were then compared with each other. In the case of 1,3-disubstituted imidazol-2-ylidene, the carbene with CH3 group has the highest nucleophilic character considering all the above scales and the highest thermodynamic stability. 1,3-Diarylimidazol-2-ylidenes with CH3O and NH2 groups have high-nucleophilic properties and high-stability; their ΔEiso values are also greater than 377 kJ/mol which means that they may be reasonable synthetic targets. While, the presence of electron donating groups at 1,3-disubstituted imidazol-2-ylidene results in ΔEiso > 377 kJ/mol. Nucleophilicity of 1,3-diarylimidazol-2-ylidenes is, to some extent, greater than that of 1,3-disubstituted imidazol-2-ylidenes.

Graphical abstract

Keywords

N-Heterocyclic carbenes Electrophilic substitutions Stability Density functional theory Carbenes 

Notes

Acknowledgements

The authors gratefully acknowledge the financial support for this work from the Research Council of Malayer and Bu-Ali Sina University, Iran.

Supplementary material

706_2018_2265_MOESM1_ESM.pdf (116 kb)
Supplementary material 1 (PDF 115 kb)

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2018

Authors and Affiliations

  • Azam Shiri
    • 1
  • Ahmad Khorramabadi-zad
    • 2
  • Zahra Siahpur
    • 2
  1. 1.Department of Applied ChemistryMalayer UniversityMalayerIran
  2. 2.Faculty of ChemistryBu-Ali Sina UniversityHamadanIran

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