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Reactions involving di-trans-[12]annulenes.

Matthew K Kiesewetter1, Matthew N Gard, Richard C Reiter

  • 1Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, USA.

Journal of the American Chemical Society
|December 7, 2006
PubMed
Summary
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Researchers synthesized novel annulene derivatives through dehydrohalogenation and ring closure reactions. These findings advance the understanding of complex polycyclic aromatic hydrocarbon formation and reactivity.

Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry
  • Polycyclic Aromatic Hydrocarbons

Background:

  • Annulenes are cyclic hydrocarbons with conjugated double bonds.
  • Synthesis of complex polycyclic systems remains a challenge in organic chemistry.

Purpose of the Study:

  • To explore novel synthetic routes to complex annulene derivatives.
  • To investigate the formation of fused ring systems from [12]annulene precursors.

Main Methods:

  • Low-temperature dehydrohalogenation of pentabromocyclododecene using potassium tert-butoxide.
  • Reaction of [12]annulene with potassium tert-butoxide and 18-crown-6.
  • Oxidation and reduction steps to isolate neutral and radical species.

Main Results:

Related Experiment Videos

  • Formation of the anion radical of 11,12-dihydro-[8]annuleno-[6]annulene from pentabromocyclododecene.
  • Isolation of the neutral molecule of 11,12-dihydro-[8]annuleno-[6]annulene.
  • Synthesis of the heptalene anion radical from a [12]annulene precursor.

Conclusions:

  • The 1,7-di-trans isomer of [12]annulene is a precursor to the heptalene anion radical.
  • The study demonstrates a novel pathway for constructing fused polycyclic aromatic systems.