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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.

Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene

Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene

Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.

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 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...

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.

Preparation of 1° Amines: Azide Synthesis

Preparation of 1° Amines: Azide Synthesis

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...

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

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Published on: August 22, 2018

2,2'-Diiodo-azobenzene.

Philip J W Elder¹, Ignacio Vargas-Baca

¹Department of Chemistry and Chemical Biology, McMaster University, 1280 Main, Street West, Hamilton, Ontario, Canada L8S 4M1.

Acta Crystallographica. Section E, Structure Reports Online

|January 4, 2013

Summary

This summary is machine-generated.

The molecular structure of (E)-bis-(2-iodo-phenyl)diazene was determined. This compound features a planar trans geometry with iodine atoms adjacent to the azo bridge, forming columns in the crystal via pi-stacking.

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Synthesis and Purification of Iodoaziridines Involving Quantitative Selection of the Optimal Stationary Phase for Chromatography

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Published on: May 16, 2014

Area of Science:

Crystallography
Organic Chemistry
Molecular Structure

Background:

Understanding the molecular architecture of organic compounds is crucial for predicting their properties and applications.
Diazene derivatives are important in various fields, including materials science and medicinal chemistry.
The presence of heavy atoms like iodine can significantly influence crystal packing and electronic properties.

Purpose of the Study:

To elucidate the precise molecular structure of (E)-bis-(2-iodo-phenyl)diazene.
To investigate the crystal packing and intermolecular interactions of the title compound.
To provide a foundation for further studies on the physical and chemical properties of this diazene derivative.

Main Methods:

Single-crystal X-ray diffraction analysis was employed to determine the molecular and crystal structure.
The crystal structure was solved and refined using standard crystallographic software.
Geometric parameters, including bond lengths, bond angles, and torsion angles, were analyzed.

Main Results:

The compound crystallizes in a structure exhibiting an essentially planar trans geometry.
The iodine atoms are positioned ortho to the azo bridge.
Offset π-stacking interactions between phenyl rings lead to the formation of one-dimensional columns along the a axis, with the closest C⋯C distance being 3.383 Å.

Conclusions:

The determined molecular structure of (E)-bis-(2-iodo-phenyl)diazene reveals a planar trans configuration.
The crystal packing is characterized by offset π-stacking, forming columnar structures.
These findings contribute to the understanding of structure-property relationships in halogenated diazene compounds.