Question

Short note on friedal craft acylation reaction

Answer 1

Answer :

Friedal Craft Acylation Reaction -

The process of substituting acyl group over benzene ring by treatment of Benzene with Acid Chloride in presence of lewis acid are known as friedal craft acylation reaction.

Benzene + Acid Chloride $\longrightarrow$ Alkyl Phenone + Hydrochloric Acid

Mechanism -

Mechanism of above reaction takes place in following three steps :

1. In this step the generation of electrophile takes place.

2. In second step, electrophile attacks over benzene ring to give a resonance stabilized carbocation.

3. In this step, resonance stabilized carbocation looses proton to give final product.

Answer 2

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Friedel Craft's acylation: The Friedel Craft's acylation attaches an acyl group (−COR) to a benzene ring. For example: When benzene is treated with acyl halide in the presence of anhydrous aluminium chloride, it yields acylbenzene. This reaction is called Friedel craft's recation. Acylation can also be carried out with acetic anhydride in the presence of anhydrous AlCl³.

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