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Five-Membered Heterocyclic Aromatic Compounds: Overview01:13

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Heterocyclic aromatic compounds are cyclic compounds that are aromatic and have one or more heteroatoms—atoms other than carbon, in the ring. Depending upon the number of atoms present in the ring, they can be either five or six-membered. Examples of five-membered heterocyclic aromatic compounds include pyrrole, furan, thiophene, and imidazole. Pyrrole consists of one nitrogen atom having one lone pair of electrons. Furan and thiophene have one oxygen and one sulfur heteroatom,...
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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
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Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
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The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
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Alkynes are unsaturated hydrocarbons characterized by the presence of carbon-carbon triple bonds and have a general formula CnH2n-2. The nomenclature of alkynes follows a set of rules similar to alkanes and alkenes; however, alkynes bear the suffix "-yne" instead of "-ane" or "-ene." There are two approaches to naming alkynes:
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Cyclo[4]pyrrole with α-β direct linkages.

Yuhua Sun1, Riku Kitahara2, Tomoya Ichino3

  • 1Division of Applied Chemistry, Faculty of Engineering, Hokkaido University Kita 13, Nishi 8, Kita-ku Sapporo Hokkaido 060-8628 Japan inokuma@eng.hokudai.ac.jp.

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|November 21, 2024
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Summary

Researchers synthesized a novel contracted porphyrin analogue, cyclo[4]pyrrole, revealing a strained, non-planar structure. This molecule exhibits unique electronic properties and electrochemical behavior, offering insights into modified porphyrin systems.

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Area of Science:

  • Organic Chemistry
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Porphyrins are vital macrocyclic compounds with diverse applications.
  • Contracted porphyrin analogues offer unique structural and electronic properties.
  • Understanding structure-property relationships in these systems is crucial for developing new materials.

Purpose of the Study:

  • To synthesize and characterize a novel cyclo[4]pyrrole, a contracted porphyrin analogue.
  • To investigate the structural, photophysical, and electrochemical properties of the synthesized cyclo[4]pyrrole.
  • To elucidate the effects of ring contraction and direct pyrrole-pyrrole linkages on the cyclo[n]pyrrole system.

Main Methods:

  • Synthesis of cyclo[4]pyrrole from an oligoketone-related precursor.
  • Structural analysis using X-ray crystallography and StrainViz.
  • Photophysical characterization including fluorescence quantum yield measurement.
  • Computational studies including NICS calculations and frontier orbital analysis.
  • Electrochemical investigations using cyclic voltammetry and spectroelectrochemistry.

Main Results:

  • Successful synthesis of cyclo[4]pyrrole with a non-planar structure and significant strain (20.8 kcal mol-1).
  • Observed visible fluorescence with a quantum yield of 0.026.
  • NICS calculations confirmed local 6π-aromaticity in pyrrole units, with global π-electron communication.
  • Reversible two-electron oxidation was observed, with spin density localization in the radical cation intermediate.
  • Spectroelectrochemical and theoretical data indicated a contribution from a triplet diradical dication form in the oxidized state.

Conclusions:

  • The structural and electrochemical properties of cyclo[4]pyrrole are significantly influenced by ring contraction and direct pyrrole-pyrrole linkages.
  • This study provides valuable insights into the fundamental behavior of contracted porphyrin analogues.
  • The findings pave the way for designing novel macrocyclic systems with tailored electronic and photophysical characteristics.