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

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

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...

Carboxylic Acids to Methylesters: Alkylation using Diazomethane

Carboxylic Acids to Methylesters: Alkylation using Diazomethane

Carboxylic acids react with diazomethane in an ether solvent via alkylation at the carboxylate oxygen atom to give methyl esters of the corresponding acid with excellent yields.

Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN1

Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic S_N1

Treating arylamines with nitrous acid gives aryldiazonium salts that are effective substrates in nucleophilic aromatic substitution reactions. The diazonio group in these salts can be easily displaced by different nucleophiles, yielding a wide variety of substituted benzenes. The leaving group departs as nitrogen gas, and this easy elimination is the driving force for the substitution reaction.
In the Sandmeyer reaction, for example, the diazonio group is replaced by a chloro, bromo, or cyano...

Diazonium Group Substitution: –OH and –H

Diazonium Group Substitution: –OH and –H

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.

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

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 para position.

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO₂ Mechanism

Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.

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Continuous Flow Chemistry: Reaction of Diphenyldiazomethane with p-Nitrobenzoic Acid

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Published on: November 15, 2017

A rapid and efficient access to diaryldibenzo[b,f][1,5]diazocines.

Xiao Wang¹, Jianzhong Li, Na Zhao

¹Qingdao Insitute of Bioenergy & Bioprocess Technology, Chinese Academy of Sciences, Qingdao, Shangdong Province, China 266101.

Organic Letters

|January 15, 2011

Summary

Researchers developed a new method for synthesizing dibenzo[b,f][1,5]-diazocines using 2-benzoylbenzoyl azides. This efficient acid-catalyzed cyclization offers a shorter synthetic route to these valuable heterocyclic compounds.

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Area of Science:

Organic Chemistry
Heterocyclic Chemistry

Background:

Dibenzo[b,f][1,5]-diazocines are important heterocyclic compounds.
Conventional synthesis methods can be lengthy and complex.

Purpose of the Study:

To develop a more efficient synthetic route to substituted dibenzo[b,f][1,5]-diazocines.
To investigate the mechanism of this novel cyclization.

Main Methods:

Acid-catalyzed cyclization of 2-benzoylbenzoyl azides.
Characterization of the resulting dibenzo[b,f][1,5]-diazocine products.

Main Results:

Facile cyclization of 2-benzoylbenzoyl azides was achieved under acidic conditions.
Substituted dibenzo[b,f][1,5]-diazocines were obtained in good yields.
The synthesis offers a shorter pathway compared to existing methods.

Conclusions:

The new method provides an efficient route to dibenzo[b,f][1,5]-diazocines.
The proposed mechanism involves an unprecedented intermolecular [2 + 2] cyclization.