Question

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Why benzaldehyde doesn't forms any product in the friedel craft acylation and alkylation ? give reasons!

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Answer 1

Answer:

Friedel–Crafts acylation involves the acylation of aromatic rings. ... This reaction has several advantages over the alkylation reaction. Due to the electron-withdrawing effect of the carbonyl group, the ketone product is always less reactive than the original molecule, so multiple acylations do not occur.

Explanation:

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Answer 2

due to electron withdraw effect of carbonyl groups.

Friedel-crafy alkylation involves the condensation of an aromatic hydrocarbon with an alkyl chloride in presence of anhydrous AlCl₃ as catalyst.

Additional Information:

Mechanism: two different mechanisms have been put forward to explain the alkylation reaction.

1st mechanism: in this mechanism, the formation of electrophile alkyl carbonium ion and other steps involved are as under :

( refer to Attachment {ii})

Limitations:

• initially formed alkyl benzene with activated alkyl group can undergo futher alkylation to give polyalkylated product.
• alkyl benzene formed in this method may also contain alkyl group different from those present in the alkylating agent, e.g.,

( refer to Attachment {iii})

• Aryl halides can't be used in place of alkyl halides due to low reactivity.

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