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Question

Why Anhydrous AlCl3 is used in Friedel Crafts reaction?


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Solution

  1. Anhydrous AlCl3 is used as a catalyst in Friedel Craft reactions.
  2. Friedel Craft reactions are reactions involve thee attack on electrophile on the aromatic ring. It is an electrophilic substitution reactions.
  3. Two primary types of Friedel Craft reactions are Friedel Craft alkylation and Friedel Craft acylation.
  4. In Friedel Craft Alkylation attack of alkyl group CH3 on aromatic ring takes place whereas in Friedel Craft acylation attack of acetyl group CH3CH2CO takes place.
  5. Anhydrous AlCl3 is used as a catalyst in Friedel Craft reactions as it is an electron -deficient species and acts as Lewis acid.
  6. AlCl3 accepts Cl- from the incoming electrophile and becomes AlCl4-.Then attack of electrophile becomes easy.

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