The Claisen rearrangement is a powerful carbon–carbon bond-forming chemical reaction discovered by Rainer Ludwig Claisen. The heating of an allyl vinyl...
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...
The Claisen condensation is a carbon–carbon bond forming reaction that occurs between two esters or one ester and another carbonyl compound in the presence...
Claisen-Schmidt condensation between an aldehyde or ketone having an α-hydrogen with an aromatic carbonyl compound lacking an α-hydrogen. A Claisen condensation...
well-known of the sigmatropic rearrangements are the [3,3] Cope rearrangement, Claisen rearrangement, Carroll rearrangement, and the Fischer indole synthesis...
Rainer Ludwig Claisen (German pronunciation: [ˈʁaɪnɐ ˈklaɪzn̩]; 14 January 1851 – 5 January 1930) was a German chemist best known for his work with condensations...
ethanol. It was first prepared in 1881 by the German chemist Rainer Ludwig Claisen (1851–1930) and the Swiss chemist Charles-Claude-Alexandre Claparède (14...
followed by hydrolysis of the acid chloride product. In 1890, Rainer Ludwig Claisen described the synthesis of ethyl cinnamate via the reaction of ethyl acetate...
water as a by-product, as well as the Claisen condensation and the Dieckman condensation (intramolecular Claisen condensation), which form alcohols as...
alkaline conditions) to salts of formic acid and methanol. The Johnson–Claisen rearrangement is the reaction of an allylic alcohol with an ortho ester...
Deprotonation gives a nucleophilic enolate, which can further react, e.g., the Claisen condensation and its intramolecular equivalent, the Dieckmann condensation...
through a Claisen condensation. This produces a racemic mixture of the 2-substituted pyrrolidine, with the retention of the thioester from the Claisen condensation...
were diethyl oxalate and 3,3-dimethylpentanoic acid, which reacted by Claisen condensation to yield diketocamphoric acid. Methylation with methyl iodide...
450–550 °C: C6H5CO2H + CH3CH2CO2H → C6H5C(O)CH2CH3 + CO2 + H2O Ludwig Claisen discovered that α-methoxystyrene forms this compound when heated for an...
4. Crossed Claisen condensations, in which the enolate and nucleophile are different esters, are also possible. An intramolecular Claisen condensation...
The Darzens reaction (also known as the Darzens condensation or glycidic ester condensation) is the chemical reaction of a ketone or aldehyde with an α-haloester...
in the presence of acid catalysts. This conversion is an example of the Claisen rearrangement. Kornblum, Nathan; Lurie, Arnold P. (1959). "Heterogeneity...
Walter Dieckmann (1869–1925). The equivalent intermolecular reaction is the Claisen condensation. Dieckmann condensations are highly effective routes to 5-...
catalysts (spiroligozymes) have been developed, an esterase mimic and a Claisen catalyst. The first Spiroligomer catalyst was an esterase-mimic, which...
chorismate by a chorismate synthase. Prephenic acid is then synthesized by a Claisen rearrangement of chorismate by chorismate mutase. Prephenate is oxidatively...
catalyzed by the current AT domain. The ACP-bound elongation group reacts in a Claisen condensation with the KS-bound polyketide chain under CO2 evolution, leaving...
progresses in a concerted fashion. Examples are hydride shifts and the Claisen rearrangement: Olefin metathesis is a formal exchange of the alkylidene...
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