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Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

3.1K
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...
3.1K
Preparation of 1° Amines: Azide Synthesis01:22

Preparation of 1° Amines: Azide Synthesis

4.1K
Direct alkylation of ammonia produces polyalkylated amines, along with a quaternary ammonium salt. To exclusively prepare primary amines, the azide synthesis method can be used.
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...
4.1K
Oxidative Cleavage of Alkenes: Ozonolysis01:46

Oxidative Cleavage of Alkenes: Ozonolysis

11.2K
In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
11.2K
Diazonium Group Substitution: –OH and –H01:19

Diazonium Group Substitution: –OH and –H

2.9K
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.
2.9K
Basicity of Heterocyclic Aromatic Amines01:25

Basicity of Heterocyclic Aromatic Amines

6.3K
Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).
6.3K
Nucleophilic Aromatic Substitution: Elimination–Addition01:11

Nucleophilic Aromatic Substitution: Elimination–Addition

4.1K
Simple aryl halides do not react with nucleophiles. However, nucleophilic aromatic substitutions can be forced under certain conditions, such as high temperatures or strong bases. The mechanism of substitution under such conditions involves the highly unstable and reactive benzyne intermediate. Benzyne contains equivalent carbon centers at both ends of the triple bond, each of which is equally susceptible to nucleophilic attack. This 50–50 distribution of products is...
4.1K

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Molecular Design Considerations for Azobenzene Anolytes.

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Researchers synthesized novel azobenzene derivatives for high-density batteries. These compounds exhibit tunable, highly negative reduction potentials and good stability, making them promising anolytes for advanced electrochemical energy storage.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Organic Chemistry

Background:

  • High-density batteries require anolytes with negative reduction potentials, solubility, and charged-state persistence.
  • Azobenzenes are explored as potential anolytes for redox flow batteries.

Purpose of the Study:

  • Synthesize and electrochemically evaluate substituted azobenzene derivatives.
  • Investigate structure-property relationships for anolyte optimization.
  • Assess stability and performance for electrochemical storage.

Main Methods:

  • Systematic synthetic derivatization of azobenzene scaffold.
  • Solution-phase electrochemical property evaluation.
  • Electrokinetic experiments and spectroscopic characterization.

Main Results:

  • Developed azobenzene derivatives with tunable solubility, including intrinsically liquid forms.
  • Achieved highly negative reduction potentials through systematic derivatization.
  • Demonstrated fast electron transfer and identified bimolecular disproportionation as the decomposition pathway for radical anions.

Conclusions:

  • Azobenzene derivatives offer tunable properties for high-density battery anolytes.
  • These findings provide a foundation for optimizing azobenzenes in electrochemical storage, particularly redox flow batteries.