wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

In Claisen condensation reaction (when an ester is treated with a strong base) :

A
A proton is removed from the α -carbon to form a resonance stabilised carbanion of the ester
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
B
Carbanion acts as a nucleophile in a nucleophilic acyl substitution reaction with another ester molecule
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C
A new CC bond is formed.
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D
α,β unsaturated product is obtained
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is C A new CC bond is formed.
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 ketoester. The reaction leads to new CC bond between the two ester substrate.

Hence, option (a), (b) and (c) are correct.

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Alkynes - Preparation
CHEMISTRY
Watch in App
Join BYJU'S Learning Program
CrossIcon