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Structure of Benzene: Kekulé Model01:07

Structure of Benzene: Kekulé Model

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In 1865, August Kekule suggested the structure of benzene according to the structural theory of organic chemistry based on the three assertions—formula of benzene is C6H6, all the hydrogens of benzene are equivalent, and each carbon must have four bonds due to its tetravalency.
He proposed that benzene has a cyclic structure of six carbon atoms attached to one hydrogen atom each, with three alternating pi bonds.
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Aromatic Hydrocarbon Cations: Structural Overview01:18

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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.
Removing one hydrogen from the intervening CH2 group...
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Structure of Conjugated Dienes01:16

Structure of Conjugated Dienes

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Introduction
Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the double...
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Criteria for Aromaticity and the Hückel 4n + 2 Rule01:20

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Like benzene, cyclobutadiene and cyclooctatetraene are cyclic compounds with alternate single and double bonds. However, their chemical behavior differs from benzene, as they are unstable and not aromatic. So, what are the structural characteristics of unsaturated compounds categorized as aromatic?  
For the first time, Eric Hückel, a German chemical physicist, derived a set of structural features for a compound to be classified as aromatic. This is now known as Hückel’s rule or the 4n +...
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Structure and Physical Properties of Alkynes02:37

Structure and Physical Properties of Alkynes

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Introduction:
In nature, compounds containing both carbon and hydrogen are known as "hydrocarbons". Aliphatic hydrocarbons are compounds whose molecules contain saturated single bonds (i.e., alkanes) or unsaturated double or triple bonds. Alkenes contain carbon–carbon double bonds and have a structural formula CnH2n. Unsaturated hydrocarbons containing carbon–carbon triple bonds are called "alkynes" and are structurally represented by the formula CnH2n-2.
The...
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Structure of Benzene: Molecular Orbital Model01:18

Structure of Benzene: Molecular Orbital Model

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According to the molecular orbital (MO) model, benzene has a planar structure with a regular hexagon of six sp2 hybridized carbons. As shown in Figure 1, each carbon is bonded to three other atoms with C–C–C and H–C–C bond angles of 120°. The C–H bond length is 109 pm, and the C–C bond length is 139 pm which is midway between the single bond length of sp3 hybridized carbons (154 pm) and sp2 hybridized carbons (133 pm).
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Related Experiment Video

Updated: Jan 7, 2026

Preparation of Stable Bicyclic Aziridinium Ions and Their Ring-Opening for the Synthesis of Azaheterocycles
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Twisted 1- and 2-Azaperopyrenes: Synthesis, Structure, and Properties.

Ricardo Molenda1, Arpine Vardanyan1, Alexander Villinger1

  • 1Institute of Chemistry, University of Rostock, Rostock, Germany.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|December 31, 2025
PubMed
Summary
This summary is machine-generated.

Researchers synthesized novel nitrogen-doped peropyrenes (azaperopyrenes) using a Brønsted acid-catalyzed reaction. This work provides new twisted peropyrene frameworks with unique conformational and electronic properties, expanding the scope of polycyclic aromatic hydrocarbons.

Keywords:
arenesaromaticitycatalysisheterocyclespalladium

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Peropyrenes are polycyclic aromatic hydrocarbons with unique photophysical properties.
  • Nitrogen doping can significantly alter the electronic and optical characteristics of organic molecules.
  • Developing novel synthetic routes to functionalized peropyrenes is crucial for advanced materials.

Purpose of the Study:

  • To report the synthesis of previously unknown 1- and 2-azaperopyrenes.
  • To investigate the structural, photophysical, and electrochemical properties of these nitrogen-doped peropyrenes.
  • To explore the influence of regioselective N-doping on the peropyrene framework.

Main Methods:

  • Brønsted acid-mediated benzannulation of alkynes for azaperopyrene synthesis.
  • Pd/C-catalyzed, copper- and amine-free Sonogashira-type coupling for alkyne intermediate synthesis.
  • X-ray crystallography, UV-Vis absorption, fluorescence spectroscopy, cyclic voltammetry, and computational studies.

Main Results:

  • Successful synthesis of 1- and 2-azaperopyrenes with twisted conformations (bay twist 10.0-19.9°, end-to-end twist 5.5-25.0°).
  • Observation of unprecedented conformational isomorphism in the synthesized compounds.
  • Demonstration of altered photophysical and electrochemical properties due to single N-doping compared to carbon congeners.

Conclusions:

  • A novel synthetic strategy for accessing twisted, nitrogen-doped peropyrene frameworks has been established.
  • The study elucidates the impact of regioselective nitrogen incorporation on the molecular conformation and electronic properties.
  • These findings open avenues for designing new functional organic materials with tailored optoelectronic characteristics.