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The Dieckmann condensation is the intramolecular chemical reaction of diesters with base to give β-keto esters. [1] It is named after the German chemist Walter Dieckmann (1869–1925). [2] [3] The equivalent intermolecular reaction is the Claisen condensation. Dieckmann condensations are highly effective routes to 5-, 6-, and 7-member rings ...
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
The Chichibabin pyridine synthesis (/ ˈ tʃ iː tʃ iː ˌ b eɪ b iː n /) is a method for synthesizing pyridine rings. The reaction involves the condensation reaction of aldehydes, ketones, α,β-Unsaturated carbonyl compounds, or any combination of the above, with ammonia. [1]
The reaction sequence in the related Hauser annulation is a Michael addition followed by a Dieckmann condensation and finally an elimination. The Dieckmann condensation is a similar ring closing intramolecular chemical reaction of diesters with base to give β-ketoesters. The Hauser donor is an aromatic sulfone or methylene sulfoxide with a ...
Claisen condensation; Claisen rearrangement; Claisen–Schmidt condensation; Clemmensen reduction; Collins reagent; Combes quinoline synthesis; Conia reaction; Conrad–Limpach synthesis; Cook–Heilbron thiazole synthesis; Cope elimination; Cope rearrangement [24] Corey reagent; Corey–Bakshi–Shibata reduction; Corey–Fuchs reaction; Corey ...
Acyloin condensation is a reductive coupling of two carboxylic esters using impure metallic sodium to yield an α-hydroxyketone, also known as an acyloin. [1] [2] [3] The acyloin condensation. The reaction is most successful when R is aliphatic and saturated, and typically performed with a silyl chloride reactant to trap the product as a ...
Claisen may refer to: Rainer Ludwig Claisen, a German chemist Claisen rearrangement, a reaction of a allyl vinyl ether to a γ,δ-unsaturated carbonyl; Claisen condensation, a reaction between esters and carbonyl compounds in the presence of a strong base; Ireland–Claisen rearrangement, a chemical reaction of an allylic ester with strong base
The reaction is known as the Claisen reaction and was described by Claisen for the first time in 1890. Discovered the thermally induced rearrangement of allyl phenyl ether in 1912. He details its reaction mechanism in his last scientific publication (1925). In his honor, the reaction has been named the Claisen rearrangement.
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