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Question

How many of the following statments are correct regarding Claisen condensation reaction (when an ester is treated with a strong base)?
1. A proton is removed from the α -carbon to form a resonance stabilised carbanion of the ester.
2. Carbanion acts as a nucleophile in a nucleophilic acyl substitution reaction with another ester molecule.
3. A new CC bond is formed.
4. α,β unsaturated product is obtained

A
3
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B
3.00
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C
3.0
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Solution

Ester undergoes self condensation in presence of strong base to give β-ketoester. This reaction is called Claisen condensation reaction.


Mechanism of Claisen condensation reaction:
1. Enolate formation: The strong base will abstract the acidic α-hydrogen to form the enolate ion which is in resonance with the ester group.

2. Nucleophile attack: Formed enolate will attack the carbonyl carbon of another ester molecule and leaving group (-OR) will leave the compound to form β keto ester. The reaction leads to new CC bond between the two ester substrate.

Hence, option (1), (2) and (3) are correct.

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