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The Dieckmann condensation, where a molecule with two ester groups reacts intramolecularly, forming a cyclic β-keto ester. In this case, the ring formed must not be strained, usually a 5- or 6-membered chain or ring. Retro-Claisen condensation is the reverse of the title reaction, i.e., the base-induced cleavage of 2-ketoesters
Quantitative yields in Claisen–Schmidt reactions have been reported in the absence of solvent using sodium hydroxide as the base and plus benzaldehydes. [5] Because the enolizable nucleophilic carbonyl compound and the electrophilic carbonyl compound are two different chemicals, the Claisen–Schmidt reaction is an example of a crossed aldol ...
The Claisen condensation involves the reaction of an ester enolate and an ester to form a beta-keto ester. Crossed Claisen condensations, in which the enolate and nucleophile are different esters, are also possible. An intramolecular Claisen condensation is called a Dieckmann condensation or
Many variations of condensation reactions exist. Common examples include the aldol condensation and the Knoevenagel condensation, which both form water as a by-product, as well as the Claisen condensation and the Dieckman condensation (intramolecular Claisen condensation), which form alcohols as by-products. [5]
Darzens condensation, Darzens–Claisen reaction, Glycidic ester condensation; Darzens halogenation; Darzens synthesis of unsaturated ketones; Darzens tetralin synthesis; Davis' reagent, Davis oxidation; Davis–Beirut reaction; De Kimpe aziridine synthesis; Dehydration reaction; Dehydrogenation; Delépine reaction; DeMayo reaction; Demjanov ...
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The first two products are the result of aldol dimerization but the latter two result from a crossed aldol reaction. Complicated mixtures from cross aldol reactions can be avoided by using one component that cannot form an enolate, examples being formaldehyde and benzaldehyde .
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