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Acid Catalysed Aldol Condensation
As we know, Condensation is an additional reaction in which two or more molecules combine to form a single molecule, eliminating small molecules like Water (H2O), Ethanol (C2H5OH), or ammonia (NH3). Let’s understand this in detail.
1.0Introduction to Condensation Reactions
Condensation reactions are a fundamental class of chemical reactions in organic and inorganic chemistry, where two molecules combine to form a larger molecule, with the simultaneous elimination of a smaller molecule such as water, alcohol, or hydrogen chloride.
2.0What is Aldol Condensation Reaction?
Aldehyde or Ketones having at least one α-H when treated with dilute alkali forms.
B-hydroxy carbonyl Compounds, Which further upon heating forms α, β– unsaturated carbonyl compounds.
Acid-Catalysed Aldol Condensation
It is a chemical reaction where an enol or enolizable aldehyde or ketone undergoes a condensation reaction in the presence of an acid catalyst, resulting in the formation of a β-hydroxy aldehyde (aldol) or β-hydroxy ketone. This reaction can further lead to the formation of an α,β-unsaturated carbonyl compound upon dehydration.
Mechanism of acid-catalyzed aldol condition
Keto-Enol Tautomerism:
- Acid catalyzes the conversion of the keto form to the enol form, which acts as the nucleophile.
Activation of the Electrophile:
- Acid protonates the carbonyl oxygen of the aldehyde or ketone, making the conjugate acid a much better electrophile due to resonance stabilization.
Aldol Addition and Dehydration:
- The enol attacks the protonated aldehyde/ketone, forming a β-hydroxy carbonyl compound (aldol addition product).
- Protonation of the hydroxyl group converts it into water (H2O), a good leaving group, leading to dehydration. This forms an α,β-unsaturated carbonyl compound via a "1,4-elimination" step.
Examples of Acid catalysed aldol condensation-
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