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Related Experiment Videos

Diphenylnitrenium ion: cyclization, electron transfer, and polymerization reactions.

Andrew C Kung1, Sean P McIlroy, Daniel E Falvey

  • 1Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742-2021, USA.

The Journal of Organic Chemistry
|June 18, 2005
PubMed
Summary

The diphenylnitrenium ion cyclizes to carbazole via a concerted cyclization/proton transfer. It reacts with electron-rich arenes via one-electron transfer, forming dimers and oligomers.

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Area of Science:

  • Organic Chemistry
  • Photochemistry
  • Computational Chemistry

Background:

  • Diphenylnitrenium ion is a reactive intermediate.
  • Understanding its reaction pathways is crucial for synthetic chemistry.

Purpose of the Study:

  • To elucidate the reaction mechanisms of the diphenylnitrenium ion.
  • To investigate its cyclization and reactions with electron-rich arenes.

Main Methods:

  • Laser flash photolysis (LFP) for kinetic studies.
  • Product analysis to identify reaction outcomes.
  • Density functional theory (DFT) for computational modeling.

Main Results:

  • Diphenylnitrenium ion undergoes concerted cyclization/proton transfer to form carbazole.

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  • Reaction with electron-rich arenes proceeds via one-electron transfer, forming radical intermediates.
  • Subsequent coupling of radicals leads to dimeric products, with further reactions yielding oligomers.

    • Conclusions:

    • The study clarifies the dual reactivity of the diphenylnitrenium ion.
    • Both cyclization and electron transfer pathways are significant.
    • DFT and LFP experiments provide complementary insights into reaction mechanisms.