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Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

2.9K
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...
2.9K
Chair Conformation of Cyclohexane02:02

Chair Conformation of Cyclohexane

14.8K
The chair conformation is the most stable form of cyclohexane due to the absence of angle and torsional strain. The absence of angle strain is a result of cyclohexane’s bond angle being very close to the ideal tetrahedral bond angle of 109.5° in its chair conformer. Similarly, the torsional strain is also absent owing to the perfectly staggered arrangement of bonds.
The hydrogen atoms linked to carbons are arranged in two different axial and equatorial orientations to achieve this...
14.8K
Five-Membered Heterocyclic Aromatic Compounds: Overview01:13

Five-Membered Heterocyclic Aromatic Compounds: Overview

4.0K
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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Conformations of Cyclohexane02:11

Conformations of Cyclohexane

12.6K
Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal...
12.6K
Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

2.8K
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.
Due to the absence of continuous...
2.8K
[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement01:21

[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement

2.8K
The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.
2.8K

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Updated: Jul 24, 2025

Preparation of a Corannulene-functionalized Hexahelicene by CopperI-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units
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Preparation of a Corannulene-functionalized Hexahelicene by CopperI-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units

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A Saddle-Shaped Expanded Porphyrinoid Fitting C60.

Theo Maulbetsch1, Philipp Frech2, Marcus Scheele2

  • 1Institut für Anorganische Chemie, Eberhard Karls Universität Tübingen, Auf der Morgenstelle 18, 72076, Tübingen, Germany.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|July 8, 2023
PubMed
Summary

Researchers developed a novel saddle-shaped macrocycle using a click reaction. This new molecule efficiently binds C60 fullerene guests, forming stacked polymers with unique photophysical properties.

Keywords:
carbazoleexpanded porphyrinoidsfullereneshost-guestmacrocycles

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Area of Science:

  • Supramolecular Chemistry
  • Organic Synthesis
  • Materials Science

Background:

  • Expanded porphyrinoids are macrocyclic compounds with unique electronic and structural properties.
  • Host-guest chemistry involving fullerenes is crucial for developing advanced materials.
  • Developing efficient synthetic routes for complex macrocycles remains a challenge.

Purpose of the Study:

  • To synthesize a novel expanded porphyrinoid macrocycle with a saddle-shaped geometry.
  • To investigate the complexation of C60 guest molecules by the new macrocycle.
  • To characterize the photophysical properties and host-guest interactions of the system.

Main Methods:

  • Copper-catalyzed click reaction for macrocycle synthesis.
  • Nuclear Magnetic Resonance (NMR) spectroscopy for solution-state analysis.
  • X-ray crystallography for solid-state structure determination.

Main Results:

  • Successful synthesis of a saddle-shaped macrocycle containing carbazole and triazole units.
  • Demonstration of efficient host-guest complexation with C60 molecules.
  • Observation of stacked polymer formation in host-guest complexes.
  • High fluorescence quantum yield (60%) of the macrocycle.

Conclusions:

  • The novel saddle-shaped macrocycle is readily synthesized and exhibits promising photophysical properties.
  • The unique geometry facilitates host-guest interactions with C60, leading to polymer formation.
  • This work opens avenues for designing new supramolecular architectures for materials applications.