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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...

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...

Nomenclature of Aryl and Heterocyclic Amines

Nomenclature of Aryl and Heterocyclic Amines

The simplest aromatic amine is phenylamine, which contains an –NH2 functionality directly attached to an aromatic ring. The name aniline is designated for this skeleton. As shown in Figure 1, the common names of the functionalized anilines involve prefixes ortho-, meta-, and para- to indicate the substitution position. Different functionalized aniline derivatives also have notable trivial names.

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,...

Physical Properties of Amines

Physical Properties of Amines

Amines with low molecular weight are usually gaseous at room temperature, while those with high molecular weight are liquid or solids in nature. Usually, low molecular weight amines have a rotten fish-like smell. Diamines typically have a pungent smell. For instance, cadaverine and putrescine, depicted in Figure 1, are two molecules responsible for decaying tissue.

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.

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Updated: Nov 27, 2025

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

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

Published on: August 22, 2018

Acetophenone Azine.

Nadia Raison-Peyron¹, Denis Sasseville²

¹From the Department of Dermatology, University of Montpellier, France.

Dermatitis : Contact, Atopic, Occupational, Drug

|December 4, 2020

Summary

This summary is machine-generated.

Acetophenone azine is a potent allergen found in ethyl vinyl acetate foam, commonly used in footwear. Recommended patch testing concentration is 0.1%, and it should be included in standard dermatological screening series.

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Area of Science:

Allergen identification
Dermatology
Materials science

Background:

Acetophenone azine (CAS 729-43-1) identified as a novel allergen.
Found in ethyl vinyl acetate foam used in shin pads and footwear.
Likely a byproduct of manufacturing additive reactions, not intentional.

Purpose of the Study:

To report the discovery of acetophenone azine as a contact allergen.
To recommend patch testing protocols for this new allergen.
To highlight the need for its inclusion in standard dermatological testing.

Main Methods:

Chemical analysis of ethyl vinyl acetate foam.
Clinical patch testing with identified compound.
Literature review on contact dermatitis and material allergens.

Main Results:

Acetophenone azine confirmed as a potent allergen.
Recommended patch testing concentration: 0.1% in acetone or petrolatum.
Positive reactions observed in patients using affected footwear.

Conclusions:

Acetophenone azine is a significant contact allergen in consumer products.
Inclusion in shoe, plastics, and glues patch test series is advised.
Availability from suppliers is currently limited but necessary for clinical practice.