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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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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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Phenylene-Bridged Expanded Porphyrazines.

Fumiya Iizuka1, Yuto Kage2, Nagao Kobayashi1,3

  • 1Department of Chemistry, Graduate School of Science, Tohoku University, Sendai, 980-8578, Japan.

Chempluschem
|January 22, 2020
PubMed
Summary
This summary is machine-generated.

Novel expanded porphyrazines with flexible structures exhibit nonaromatic properties in solution, despite possessing [4n]π-electron systems. This research explores the synthesis and topological characterization of these unique organic molecules.

Keywords:
aromaticityporphyrazinesporphyrinoidsstructure determination

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Area of Science:

  • Organic Chemistry
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Expanded porphyrazines are macrocyclic compounds with unique electronic and photophysical properties.
  • Understanding the relationship between molecular structure and aromaticity is crucial in macrocyclic chemistry.

Purpose of the Study:

  • To synthesize novel expanded porphyrazines incorporating ortho- and para-phenylene units.
  • To elucidate the topological structures (Möbius and Hückel) of these novel compounds.
  • To investigate the aromaticity of these expanded porphyrazines in solution.

Main Methods:

  • Synthesis via self-condensation of acyclic [2+1]-type precursors.
  • Preparation of precursors from 1,3-diiminoisoindoline and phenylenediamines.
  • Structural elucidation using X-ray crystallography.

Main Results:

  • Successful synthesis of expanded porphyrazines with o- and p-phenylene units.
  • Determination of Möbius and Hückel topologies for [4+2]- and [3+2]-type structures, respectively.
  • Observation of nonaromatic behavior in solution, attributed to structural flexibility.

Conclusions:

  • Flexible structures in solution significantly diminish the intrinsic aromaticity and antiaromaticity of these expanded porphyrazines.
  • The study provides insights into the structure-property relationships of novel macrocyclic systems.
  • This work contributes to the understanding of aromaticity in complex organic frameworks.