Decarboxylation
Decarboxylation - Related Videos
09:58
Light-driven Enzymatic Decarboxylation
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Cited by 6 •
2016
We describe a protocol for the light-catalyzed generation of hydrogen peroxide — a cofactor for oxidative transformations.
01:02
Loss of Carboxy Group as CO2: Decarboxylation of β-Ketoacids
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2023
Carboxylic acids, upon heating, undergo a decarboxylation reaction by releasing carbon dioxide gas. Monocarboxylic acids do not undergo decarboxylation easily. However, a silver salt of carboxylic acid reacts with bromine or iodine under high temperature to release carbon dioxide gas and forms halide with one less carbon. This reaction is called the Hunsdiecker reaction. Unlike monocarboxylic acids, ꞵ-keto acids bearing a keto group at the β position to the carboxyl group, readily undergo...
01:35
Loss of Carboxy Group as CO2: Decarboxylation of Malonic Acid Derivatives
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2025
Just like β-keto acids—which upon thermal decarboxylation form ketones—β-dicarboxylic acids undergo decarboxylation to generate monocarboxylic acids with the liberation of carbon dioxide. The mechanism initiates with an internal electronic redistribution, resulting in a cyclic six-membered transition state. This is followed by a C–C bond cleavage to produce an enol by releasing carbon dioxide gas. Next, the enol rapidly tautomerizes under the acidic conditions to yield a more stable...
02:36
The Citric Acid Cycle
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2019
The citric acid cycle, also known as the Krebs cycle or TCA cycle, consists of several energy-generating reactions that yield one ATP molecule, three NADH molecules, one FADH2 molecule, and two CO2 molecules. Acetyl CoA is the point-of-entry into the citric acid cycle, which occurs in the inner membrane (i.e., matrix) of mitochondria in eukaryotic cells or the cytoplasm of prokaryotic cells. Prior to the citric acid cycle, pyruvate oxidation produced two acetyl CoA molecules per glucose...
09:10
Synthesis of Indoxyl-glycosides for Detection of Glycosidase Activities
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Cited by 4 •
2015
Indoxyl glycosides are well-established and widely used tools for enzyme screening and enzyme activity monitoring. Especially for glucose type structures previous syntheses proved to be challenging and low yielding. Our novel approach employs indoxylic acid esters as precious intermediates to yield a considerable number of indoxyl glycosides in good yields.
FAQs
For beta-keto acids, the carboxyl-containing arrangement enables decarboxylation through a six-membered transition state. Heating promotes the sequence in which the carbon–carbon bond adjacent to the carboxyl group cleaves, carbon dioxide is released, and proton transfer completes formation of the product. This pathway explains why beta-keto acids are especially suitable substrates for the reaction.
Heat, acid, base, and catalysts serve as enabling conditions rather than interchangeable products. Each can promote cleavage of the carbon–carbon bond next to the carboxyl group, allowing the reaction sequence to proceed. In practice, identifying which of these conditions is available helps chemists frame how a substrate may be converted and whether decarboxylation is feasible.
Proton transfer is the finishing event in the beta-keto-acid pathway. After the six-membered transition state and carbon dioxide loss, this transfer converts the species formed during cleavage into the reaction product. Including proton transfer in the mechanism clarifies that decarboxylation is not only carbon dioxide extrusion but a coordinated sequence of structural changes.
A basic workflow starts with a carboxyl-containing substrate, then applies a promoting condition such as heat, acid, base, or a catalyst. For a beta-keto acid, the reaction can be represented as transition-state formation, carbon dioxide loss, and proton transfer. The resulting compound has one fewer carbon atom, which helps organize product prediction.
Decarboxylation is valuable when a synthesis requires removal of one carbon from a carboxyl-containing starting material. Depending on the substrate and reaction context, it can support preparation of hydrocarbons, ketones, and other valuable compounds. The carbon dioxide loss therefore becomes a strategic step for changing carbon skeletons while accessing useful product classes.
In chemistry, the reaction connects fundamental organic mechanisms with broader scientific applications. Its behavior in beta-keto acids illustrates how molecular arrangement and proton transfer shape an outcome, while related decarboxylation reactions contribute to natural metabolism, pharmaceutical production, and preparation of complex molecules. This makes the process relevant both to mechanistic study and to applied molecular synthesis.