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Electrophilic Aromatic Substitution: Chlorination and Bromination of Benzene

Electrophilic Aromatic Substitution: Chlorination and Bromination of Benzene

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...

Aromatic Compounds: Overview

Aromatic Compounds: Overview

In general, the term ‘aromatic’ indicates a pleasant smell or fragrance from fresh flowers, freshly prepared coffee, etc. In the early history of organic chemistry, many benzene derivatives were isolated from the pleasant odor oils of the plants. For example, vanillin was isolated from the oil of vanilla, methyl salicylate from the oil of wintergreen, and cinnamaldehyde from the oil of cinnamon. They all had a pleasant odor; hence the name aromatic was given.
In 1825, Faraday isolated benzene...

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.

Electrophilic Aromatic Substitution: Sulfonation of Benzene

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Sulfonation of benzene is a reaction wherein benzene is treated with fuming sulfuric acid at room temperature to produce benzenesulfonic acid. Fuming sulfuric acid is a mixture of sulfur trioxide and concentrated sulfuric acid.

Electrophilic Aromatic Substitution: Nitration of Benzene

Electrophilic Aromatic Substitution: Nitration of Benzene

The nitration of benzene is an example of an electrophilic aromatic substitution reaction. It involves the formation of a very powerful electrophile, the nitronium ion, which is linear in shape. The reaction occurs through the interaction of two strong acids, sulfuric and nitric acid.

Nucleophilic Aromatic Substitution: Elimination–Addition

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Simple aryl halides do not react with nucleophiles. However, nucleophilic aromatic substitutions can be forced under certain conditions, such as high temperatures or strong bases. The mechanism of substitution under such conditions involves the highly unstable and reactive benzyne intermediate. Benzyne contains equivalent carbon centers at both ends of the triple bond, each of which is equally susceptible to nucleophilic attack. This 50–50 distribution of products is confirmed through isotopic...

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Updated: Jul 7, 2026

Efficient Synthesis of Polyfunctionalized Benzenes in Water via Persulfate-promoted Benzannulation of α,β-Unsaturated Compounds and Alkynes

Efficient Synthesis of Polyfunctionalized Benzenes in Water via Persulfate-promoted Benzannulation of α,β-Unsaturated Compounds and Alkynes

Published on: December 16, 2019

Recent Advances in Benzannulation Approaches to Aromatic Frameworks.

Heeeun Kim¹, Yonghoon Kwon^1,2

¹Department of Agricultural Biotechnology, Seoul National University, Seoul, Republic of Korea.

Chemistry, an Asian Journal

|July 6, 2026

Summary

Benzannulation offers a versatile method to create complex substituted arenes, overcoming limitations of traditional functionalization. This review covers recent advances in metal-catalyzed and metal-free benzannulation strategies for efficient synthesis.

Keywords:

arene benzannulation benzene

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Preparation of N-(2-alkoxyvinyl)sulfonamides from N-tosyl-1,2,3-triazoles and Subsequent Conversion to Substituted Phthalans and Phenethylamines

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Published on: January 3, 2018

Area of Science:

Organic Chemistry
Synthetic Chemistry
Catalysis

Background:

Substituted arenes are crucial building blocks in pharmaceuticals, agrochemicals, and materials science.
Conventional arene functionalization methods are often limited by the starting material's substitution pattern.

Purpose of the Study:

To review recent advancements (last 5 years) in benzannulation strategies for synthesizing substituted arenes.
To compare transition-metal-catalyzed and metal-free approaches for benzannulation.
To provide guidance on selecting and designing benzannulation routes for complex arene synthesis.

Main Methods:

Exploration of metal-catalyzed cascades (e.g., transition-metal catalysis).
Investigation of metal-free cyclization processes (e.g., pericyclic reactions, radical cyclizations, benzyne chemistry).
Comparative analysis of different benzannulation methodologies.

Main Results:

Benzannulation enables the construction of aromatic cores from acyclic or nonaromatic precursors.
Recent developments offer improved control over regioselectivity and functional-group tolerance.
Both metal-catalyzed and metal-free strategies present distinct advantages in bond-forming logic and mechanism.

Conclusions:

Benzannulation is a powerful strategy to access complex substituted arenes, overcoming limitations of traditional methods.
Recent advances focus on step economy and sustainability in benzannulation route design.
This review provides practical insights for synthetic chemists utilizing benzannulation.