Enolates with aldehydes and ketones
(Aldol Reaction)

Knoevenagel condensation

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The Knoevenagel condensation is the reaction of stabilised carbanions with carbonyl compounds. A secondary amine is used as the base, as it allows partial deprotonation of a 1,3-dicarbonyl compound but not of a normal aldehyde, so self-condensation of the aldehyde is not a problem.