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Related Concept Videos

Stability of Substituted Cyclohexanes02:30

Stability of Substituted Cyclohexanes

12.6K
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...
12.6K
Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

2.9K
The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the...
2.9K
Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview01:07

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview

3.2K
In the presence of an aqueous base and a halogen, primary amides can lose the carbonyl (as carbon dioxide) and undergo rearrangement to form primary amines. This reaction, called the Hofmann rearrangement, can produce primary amines (aryl and alkyl) in high yields without contamination by secondary and tertiary amines.
3.2K
Radical Reactivity: Steric Effects01:10

Radical Reactivity: Steric Effects

1.9K
The presence of electron-donating, electron-withdrawing, or conjugating groups adjacent to a radical center, imparts electronic stabilization to the radicals. Examples of such electronically-stabilized radicals are triphenylmethyl, tetramethylpiperidine‐N‐oxide, and 2,2‐diphenyl‐1‐picrylhydrazyl. These radicals are remarkably stable and are known as persistent radicals. Some of the persistent radicals can even be isolated and purified.
Along with electronic...
1.9K
[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement01:21

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

2.7K
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.
2.7K
E1 Reaction: Stereochemistry and Regiochemistry02:43

E1 Reaction: Stereochemistry and Regiochemistry

9.5K
One of the critical aspects of the E1 reaction mechanism, as also observed in E2, is the regiochemistry, with multiple regioisomers obtained as products. In the example discussed, the presence of water as a weak base favors elimination over substitution to generate two alkenes. Given that alkenes’ stability increases with the number of alkyl groups across the double bond, typically, E1 reactions lead to the Zaitsev product, for this is more substituted and stable than the Hofmann product.
9.5K

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Related Experiment Video

Updated: Jul 2, 2025

Preparation of Stable Bicyclic Aziridinium Ions and Their Ring-Opening for the Synthesis of Azaheterocycles
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Stabilizing Azaheptacenes.

Wansheng Zong1, Nikolai Hippchen1, Nico Zeitter1

  • 1Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany.

Journal of the American Chemical Society
|February 27, 2024
PubMed
Summary
This summary is machine-generated.

This study synthesized a stable diazaheptacene derivative using palladium catalysis. The bulky TIPS-ethynyl groups and pyrazine core prevent degradation, enabling its use in thin-film transistors.

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Preparation of Contiguous Bisaziridines for Regioselective Ring-Opening Reactions
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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Heptacenes are large polycyclic aromatic hydrocarbons with potential electronic applications.
  • Their inherent instability, due to dimerization and oxidation, limits their practical use.
  • Steric hindrance and heteroatom incorporation are strategies to enhance stability.

Purpose of the Study:

  • To synthesize and characterize a novel, stable diazaheptacene derivative.
  • To investigate the effect of substituent positioning and heteroatom incorporation on heptacene stability.
  • To evaluate the performance of the synthesized material in organic electronics.

Main Methods:

  • Palladium-catalyzed cross-coupling reaction between substituted anthracenes.
  • Single crystal X-ray diffraction for structural analysis.
  • Fabrication and characterization of thin-film transistors (TFTs).

Main Results:

  • A symmetrical 7,16-diaza-6,8,15,17-tetrakis(triisopropylsilylethynyl)heptacene was successfully synthesized.
  • The triisopropylsilylethynyl (TIPS-ethynyl) groups adjacent to the central ring effectively suppressed dimerization.
  • The central pyrazine ring conferred oxidative stability, and TFTs exhibited electron mobility (μn) of 0.042 cm²/V·s.
  • Alternative substitution patterns and increased nitrogen content reduced stability.

Conclusions:

  • Strategic placement of bulky TIPS-ethynyl groups and incorporation of a pyrazine ring are effective for stabilizing heptacene cores.
  • The synthesized diazaheptacene derivative demonstrates promise for organic electronic applications.
  • Further research into structure-property relationships can guide the design of advanced organic semiconductors.