21.6 Claisen Condensation Reactions

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    Self Claisen Condensations

    Claisen Condensation are Base-catalyzed only - Enolate adds to an ester

    self-claisen condensation

    Crossed (Mixed) Claisen Condensations

    Must use LDA to form the enolate to get a good yield of a single product.

    crossed claisen condensation

    Dieckmann Condensation
    (Intramolecular Claisen Condensation)

    -Generally only 5- or 6-membered rings will form

    dieckmann condensation