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Related Concept Videos

Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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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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Diazonium Group Substitution: –OH and –H01:19

Diazonium Group Substitution: –OH and –H

1.8K
Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
1.8K
Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions01:20

Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions

1.9K
Arenediazonium substitution reactions occur when the diazonium group is substituted by various functional groups such as halides, hydroxyl, nitrile, etc. For instance, arenediazonium salts react with copper(I) salts of chloride, bromide, or cyanide to form corresponding aryl chlorides, bromides, and nitriles. These reactions are named Sandmeyer reactions. Although the mechanism of this reaction is complicated, as illustrated in Figure 1, they are believed to progress via an aryl copper...
1.9K
Stability of Conjugated Dienes01:28

Stability of Conjugated Dienes

3.3K
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.
3.3K
Structure of Conjugated Dienes01:16

Structure of Conjugated Dienes

5.5K
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...
5.5K
Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

3.2K
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...
3.2K

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A persistent diazaheptacene derivative.

Jens U Engelhart1, Olena Tverskoy, Uwe H F Bunz

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

Journal of the American Chemical Society
|October 9, 2014
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Summary
This summary is machine-generated.

Researchers synthesized stable diazaheptacene derivatives using bulky silyl protecting groups. These groups prevent dimerization, enabling characterization of these complex organic molecules.

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Area of Science:

  • Organic Chemistry
  • Materials Science

Background:

  • Diazaheptacenes are complex polycyclic aromatic hydrocarbons with potential applications in organic electronics.
  • Unprotected diazaheptacenes are prone to dimerization via Diels-Alder reactions, hindering their isolation and characterization.

Purpose of the Study:

  • To synthesize and characterize novel diazaheptacene derivatives.
  • To identify effective protecting groups that prevent dimerization and allow for isolation.

Main Methods:

  • Synthesis of diazaheptacene core.
  • Attachment of silylethynyl protecting groups.
  • Characterization using Nuclear Magnetic Resonance (NMR) and UV-Vis spectroscopies.
  • Electrochemical analysis using cyclic voltammetry.

Main Results:

  • Diazaheptacene derivatives were successfully synthesized.
  • Triisopropylsilyl (TIPS)-ethynyl groups were insufficient for stabilization.
  • Four silicon(sec-butyl)3-ethynyl groups provided effective steric protection, preventing Diels-Alder dimerization.
  • The protected diazaheptacenes were isolable and characterized.

Conclusions:

  • Bulky silyl protecting groups are essential for the isolation and characterization of diazaheptacenes.
  • The developed synthetic strategy enables access to stable diazaheptacene derivatives for further investigation.