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Radical Substitution: Allylic Bromination

Radical Substitution: Allylic Bromination

In organic synthesis, the formation of products can be altered by changing the reaction conditions. For example, a dibromo addition product is formed when propene is treated with bromine at room temperature. In contrast, propene undergoes allylic substitution in non-polar solvents at high temperatures to give 3-bromopropene. In order to avoid the addition reaction, the bromine concentration must be kept as low as possible throughout the reaction. This can be achieved using N-bromosuccinimide...

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Chlorination and bromination are important classes of electrophilic aromatic substitutions, where benzene reacts with chlorine or bromine in the presence of a Lewis acid catalyst to give halogenated substitution products. A Lewis acid such as aluminium chloride or ferric chloride catalyzes the chlorination, and ferric bromide catalyzes the bromination reactions. During the bromination of alkenes, bromine polarizes and becomes electrophilic. However, in the bromination of benzene, the bromine...

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Bromination of deactivated aromatics: a simple and efficient method.

K Rajesh¹, M Somasundaram, R Saiganesh

¹Shasun Research Centre, No. 27 Vandaloor-Kelambakkam Road, Keelakottaiyur, Chennai-600 048, India.

The Journal of Organic Chemistry

|June 26, 2007

Summary

Synthesize bromo compounds from deactivated aromatics using N-bromosuccinimide (NBS) in sulfuric acid. This method offers good yields and a practical, commercially viable route for aromatic bromination.

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Area of Science:

Organic Chemistry
Synthetic Chemistry

Background:

Aromatic compounds are fundamental building blocks in chemistry.
Introducing bromine atoms (bromination) is a key transformation for synthesizing diverse organic molecules.
Brominating highly deactivated aromatic compounds can be challenging due to their reduced reactivity.

Purpose of the Study:

To develop an efficient method for the monobromination of highly deactivated aromatic compounds.
To establish a practical and commercially viable synthetic route for producing bromo derivatives of deactivated aromatics.

Main Methods:

Treatment of deactivated aromatic compounds with N-bromosuccinimide (NBS).
Reaction conducted in a concentrated sulfuric acid (H2SO4) medium.
Isolation and purification of the resulting bromo compounds.

Main Results:

Smooth monobromination of highly deactivated aromatic compounds was achieved.
Good yields of the corresponding bromo derivatives were obtained.
The reaction conditions were mild and the workup procedure was simple.

Conclusions:

The N-bromosuccinimide (NBS) in concentrated sulfuric acid method is effective for brominating deactivated aromatics.
This protocol represents a practical and commercially viable approach for synthesizing bromo compounds.
The method offers an accessible route for accessing valuable brominated aromatic intermediates.