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Related Concept Videos

Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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 with both...
Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

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 overlap of p...
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Structure of Conjugated Dienes01:16

Structure of Conjugated Dienes

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...
Stability of Conjugated Dienes01:28

Stability of Conjugated Dienes

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.

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Related Experiment Video

Updated: Jul 10, 2026

Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
09:45

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

Published on: March 20, 2017

A new functionalization strategy for pentacene.

John E Anthony1, Johannes Gierschner, Chad A Landis

  • 1Department of Chemistry, University of Kentucky, Lexington, KY 40506-0055, USA. anthony@uky.edu

Chemical Communications (Cambridge, England)
|November 16, 2007
PubMed
Summary
This summary is machine-generated.

Functionalizing pentacene with rigid 1,3-dioxole units yields stable, soluble derivatives. These compounds maintain crucial edge-to-face interactions in solid-state organic electronics.

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Functionalization of Single-walled Carbon Nanotubes with Thermo-reversible Block Copolymers and Characterization by Small-angle Neutron Scattering
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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Solid-State Physics

Background:

  • Pentacene is a model organic semiconductor.
  • Functionalization is key to tuning material properties.
  • Achieving stability and solubility without losing intermolecular interactions is challenging.

Purpose of the Study:

  • To synthesize novel pentacene derivatives.
  • To investigate the impact of perpendicular functionalization on pentacene properties.
  • To maintain solid-state packing and electronic interactions.

Main Methods:

  • Synthesis of pentacene derivatives using a rigid 1,3-dioxole unit.
  • Characterization of solubility and stability.
  • Solid-state structural analysis to confirm intermolecular interactions.

Main Results:

  • Stable and soluble pentacene derivatives were successfully synthesized.
  • The 1,3-dioxole unit effectively holds functional groups perpendicular to the pentacene core.
  • Edge-to-face pi-pi stacking interactions were preserved in the solid state.

Conclusions:

  • Perpendicular functionalization via rigid units is a viable strategy for stable pentacene derivatives.
  • These derivatives retain desirable solid-state packing for electronic applications.
  • This approach offers a pathway to processable high-performance organic semiconductors.