Bromination of Benzene - Pharmacareerinsider
March 29, 2025
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Bromination of Benzene

The Bromination of benzene involves the introduction of a bromine atom onto the benzene ring through electrophilic aromatic substitution. A Lewis acid typically catalyzes the reaction, often iron (III) chloride (FeCl3).

Here is the reaction with a concise explanation:

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Here is a step-by-step mechanism for the bromination of benzene:

Step 1: Formation of electrophile:

The Lewis acid catalyst (FeCl3) helps generate an electrophile (Cl+) by causing the polarisation of the bromine molecule.

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Step 2: Formation of carbocation

The electrophile (Br+) attacks the benzene ring to form an intermediate of carbocation which is resonance stabilised. It is a slow step.

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Step 3: Protonation

Proton transfer from the carbocation to form bromobenzene.

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Thanks !

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