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Related Concept Videos

Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

4.3K
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...
4.3K
Stability of Conjugated Dienes01:28

Stability of Conjugated Dienes

4.7K
Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
4.7K
Chair Conformation of Cyclohexane02:02

Chair Conformation of Cyclohexane

21.3K
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...
21.3K
Conformations of Cycloalkanes02:29

Conformations of Cycloalkanes

16.6K
Adolf von Baeyer attempted to explain the instabilities of small and large cycloalkane rings using the concept of angle strain — the strain caused by the deviation of bond angles from the ideal 109.5° tetrahedral value for sp3  hybridized carbons. However, while cyclopropane and cyclobutane are strained, as expected from their highly compressed bond angles, cyclopentane is more strained than predicted, and cyclohexane is virtually strain-free. Hence, Baeyer’s theory that...
16.6K
Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

4.3K
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...
4.3K
Stability of Substituted Cyclohexanes02:30

Stability of Substituted Cyclohexanes

17.3K
This lesson discusses the stability of substituted cyclohexanes with a focus on energies of various conformers and the effect of 1,3-diaxial interactions.
The two chair conformations of cyclohexanes undergo rapid interconversion at room temperature. Both forms have identical energies and stabilities, each comprising equal amounts of the equilibrium mixture. Replacing a hydrogen atom with a functional group makes the two conformations energetically non-equivalent.
For example, in...
17.3K

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Related Experiment Video

Updated: Mar 27, 2026

Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
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Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene

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Stabilizing Pentacene By Cyclopentannulation.

Sambasiva R Bheemireddy1, Pamela C Ubaldo1, Peter W Rose1

  • 1Department of Chemistry and Biochemistry and the Materials Technology Center, Southern Illinois University, Carbondale, IL 62901 (USA).

Angewandte Chemie (International Ed. in English)
|January 16, 2016
PubMed
Summary
This summary is machine-generated.

Researchers developed novel, photostable pentacene derivatives using palladium-catalyzed reactions. These new organic materials exhibit strong electron acceptor properties and narrow energy gaps, advancing electronic material applications.

Keywords:
acenesconjugationorganic electronicspalladiumpolycyclic aromatic hydrocarbons

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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Photochemistry

Background:

  • Pentacene derivatives are crucial organic semiconductors.
  • Developing photostable and electronically tunable pentacene-based materials remains a challenge.
  • Externally fused ring systems offer a route to modify pentacene properties.

Purpose of the Study:

  • To synthesize a new class of stabilized pentacene derivatives with externally fused five-membered rings.
  • To characterize the electronic properties and photostability of these novel compounds.
  • To evaluate their potential as strong electron acceptors.

Main Methods:

  • Palladium-catalyzed cyclopentannulation for key C-C bond formation.
  • Synthesis via chemical manipulation of a 6,13-dibromopentacene precursor.
  • DDQ-mediated dehydrogenation for final aromatization.

Main Results:

  • Successfully prepared 1,2,8,9-tetraaryldicyclopenta[fg,qr]pentacene derivatives.
  • Compounds exhibit narrow energy gaps (approx. 1.2 eV).
  • Demonstrated strong electron acceptor behavior with LUMO energies between -3.81 and -3.90 eV.
  • New derivatives show enhanced photostability compared to TIPS-pentacene.

Conclusions:

  • The new pentacene derivatives offer improved photostability and desirable electronic properties.
  • The synthetic strategy provides access to a promising class of organic electronic materials.
  • These compounds hold potential for applications requiring robust electron acceptors.