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VITEEE 2013 Solved Paper
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© examsnet.com
Question : 69
Total: 120
In a Claisen condensation reaction (when an ester is treated with a strong base)
a proton is removed from the a -carbon to form a resonance stabilised carbanion of the ester
carbanion acts as a nucleophile in a nucleophilic acyl substitution reaction with another ester molecule
a new C—C bond is formed
All of the above statements are correct
Validate
Solution:
When two molecules of an ethylacetate undergo condensation reaction, in presence of sodium ethoxide involving the reaction is called as Claisen condensation and product is a β - keto ester
2
C
H
3
C
H
2
O
|
|
C
O
C
H
3
(
i
)
C
H
3
O
→
(
i
i
)
H
+
C
H
3
C
H
2
O
|
|
C
β
C
|
|
α
C
H
3
O
|
|
C
O
C
H
3
+
C
H
3
O
H
Mechanism
Step I
Step II
Step III
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