Explain Friedel-Craft’s acylation reaction of benzene. Give examp… - Vidyadip

Question

Explain Friedel-Craft’s acylation reaction of benzene. Give example reactions.

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Answer

Friedel-craft’s acylation reaction of benzene:
i. When benzene is heated with an acyl halide or acid anhydride in the presence of anhydrous aluminium chloride, it gives corresponding acyl benzene.

ii. Electrophile involved in the reaction: R – C- = O, acylium ion
Formation of the electrophile: $R - COCl + AlCl _3 \rightarrow R - C ^{+}=$ $O + AlCl _4^{-}$

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