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Difference Between Azo and Diazo

December 25, 2019Posted byMadhu

Thekey difference偶氮和重氮之间the term azo refers to the presence of N=N group, whereas the term diazo refers to the presence of an azo group at the terminal of anorganic compound.

Azo and diazo are two terms we can find in the field of organic chemistry. The term azo is used to name compounds containing thefunctional groupN=N, and if this functional group is located at a terminal of the molecule, then we call it a diazo compound.

CONTENTS

1.Overview and Key Difference
2.什么is Azo
3.什么is Diazo
4.Side by Side Comparison – Azo vs Diazo in Tabular Form
5.Summary

什么is Azo?

The term azo refers to the presence of an N=N functional group. In organic compounds, this functional group occurs in the form of R-N=N-R’ where R and R’ are eitheralkyl or aryl groups. The name azo originates from the term azote, which refers to the French name for nitrogen.

Difference Between Azo and Diazo

Figure 01: General Formula of Azo Compound

Aryl azo compounds are comparatively stable than alkyl azo compounds, and they usually occur in crystalline form. For example, azobenzene contains two benzene rings as R and R’ of the azo compound. It mainly exists in the trans isomeric form but it can convert into the cis isomer as well upon illumination. Azo coupling is the process from which we can produce azo compounds. It is a form of electrophilic substitution reaction.

Alkyl azo compounds contain alkyl groups attached to the azo functional group. We can call them aliphatic azo compounds. An example of a simple alkyl azo compound is diethyldiazene. It has two ethyl groups attached to the N=N functional group.

什么is Diazo?

The term diazo refers to the presence of two nitrogen atoms attached to the terminal of an organic compound. The general structural formula for this type of compounds is R2C=N+=N–. An example of a simple diazo compound is diazomethane, which has an azo functional group attached to a methane molecule.

关键的区别-偶氮vs Diazo

Figure 02: Diazo Compounds

These diazo compounds can act as 1, 3-dipoles in cycloaddition reactions. Moreover, they can act as precursors for carbene production. In addition, they can react as nucleophiles in nucleophilic addition reactions. When considering the synthesis of diazo compounds, we can synthesize them from amines, from diazomethyl compounds, via diazo transfer, from hydrazones, etc.

偶氮和重氮之间的区别是什么?

The key difference between azo and diazo is that the term azo refers to the presence of N=N group, whereas the term diazo refers to the presence of an azo group at the terminal of an organic compound. In azo compounds, the N=N functional group occurs at the middle of the compound where the two terminals of the functional group are attached with some other substituent groups. In contrast, in diazo compounds, the functional group occurs at the terminal of the compound. The general chemical formula for an azo compound is R-N=N=R’, while the general chemical formula of a diazo compound is R2C=N+=N–.

There are two types of azo compounds as alkyl and aryl azo compounds. A simple example of an aryl azo compound is azobenzene. A simple example of a diazo compound is diazomethane.

Below infographic summarizes the difference between azo and diazo.

Difference Between Azo and Diazo in Tabular Form

Summary – Azo vs Diazo

The terms azo and diazo come mainly under the field of organic chemistry. The key difference between azo and diazo is that the term azo refers to the presence of N=N group, whereas the term diazo refers to the presence of an azo group at the terminal of an organic compound.

Reference:

1. “Azo Compound.” Wikipedia, Wikimedia Foundation, 18 Oct. 2019,Available here.
2. “Diazo.” Wikipedia, Wikimedia Foundation, 6 Aug. 2019,Available here.

Image Courtesy:

1. “Azo-group-2D-flat” By Benjah-bmm27 – Own work (Public Domain) viaCommons Wikimedia
2. “DiazoResonance” By Wereon – Own work (Public Domain) viaCommons Wikimedia

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Filed Under:Organic Chemistry

About the Author:Madhu

Madhu is a graduate in Biological Sciences with BSc (Honours) Degree and currently persuing a Masters Degree in Industrial and Environmental Chemistry. With a mind rooted firmly to basic principals of chemistry and passion for ever evolving field of industrial chemistry, she is keenly interested to be a true companion for those who seek knowledge in the subject of chemistry.

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