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Mechanisms of aldol condensation

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Mechanisms of aldol condensation

Posted by Kshitij Bajpai 6 years, 11 months ago

CBSE > Class 12 > Chemistry

1 answers

Yogita Ingle 6 years, 11 months ago

The mechanism of aldol condensation initiates with the formation of carbanion intermediate. Refer to the steps below to observe the mechanism of aldol condensation in the presence of a base as a catalyst.

Aldol Condensation in Aldehydes with Base as a Catalyst

Step 1: Removal of α-hydrogen from the base
Step 2: The first step results in the formation of carbanion which undergoes a nucleophilic addition reaction with the carbonyl group present in the second molecule of the aldehyde (in this case ethanal). The second step results in the formation of the condensation product.
Step 3: Protonation of alkoxide ion will occur due to reaction with water.
Step 4: Heating of the aldol compound in the basic solution will help in dehydrating the product to form α β‐unsaturated aldehyde compound.

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