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Loss of Carboxy Group as CO2: Decarboxylation of β-Ketoacids

Loss of Carboxy Group as CO₂: Decarboxylation of β-Ketoacids

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.

Loss of Carboxy Group as CO2: Decarboxylation of Malonic Acid Derivatives

Loss of Carboxy Group as CO₂: Decarboxylation of Malonic Acid Derivatives

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.

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Intramolecular Claisen Condensation of Dicarboxylic Esters: Dieckmann Cyclization

Dieckmann cyclization is an intramolecular Claisen condensation of diesters. The reaction occurs in the presence of a base and generates a cyclic β-ketoester as the final product. Commonly, 1, 6 and 1, 7-diesters are preferred substrates for the reaction since the generated five, and six-membered cyclic β-keto esters are particularly more stable.

C–C Bond Cleavage: Retro-Aldol Reaction

C–C Bond Cleavage: Retro-Aldol Reaction

The reverse of the aldol addition reaction is called the retro-aldol reaction. Here, the carbon–carbon bond in the aldol product is cleaved under acidic or basic conditions to form two molecules of carbonyl compounds. The mechanism of the reaction consists of three steps.
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Baeyer–Villiger oxidation converts aldehydes to carboxylic acids and ketones to esters. The reaction uses peroxy acids or peracids and is often catalyzed by acid. The reaction is named after its pioneers, Adolf von Baeyer and Victor Villiger. The reaction is achieved by a wide range of peracids such as m-chloroperoxybenzoic acid (mCPBA), perbenzoic acid (C6H5COOOH), peracetic acid (CH3COOOH), hydrogen peroxide (H2O2), and tert-butyl hydroperoxide (t-BuOOH).
The carbonyl center is activated by...

Aldol Condensation with β-Diesters: Knoevenagel Condensation

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Updated: May 27, 2026

Light-driven Enzymatic Decarboxylation

Light-driven Enzymatic Decarboxylation

Published on: May 22, 2016

The decarboxylative Strecker reaction.

Deepankar Das¹, Matthew T Richers, Longle Ma

¹Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, USA.

Organic Letters

|November 18, 2011

Summary

This summary is machine-generated.

This study introduces a novel decarboxylative Strecker reaction, enabling α-amino acids and aldehydes to form α-amino nitriles without metal catalysts. This method provides access to unique amino nitriles not achievable through traditional Strecker synthesis.

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Area of Science:

Organic Chemistry
Synthetic Chemistry

Background:

The classical Strecker reaction is a cornerstone for synthesizing α-amino acids and their derivatives.
Traditional Strecker methods often require specific conditions or catalysts, limiting access to certain α-amino nitrile structures.

Purpose of the Study:

To develop a novel, metal-free synthetic route to α-amino nitriles.
To explore a decarboxylative variant of the Strecker reaction using α-amino acids and aldehydes.

Main Methods:

Reaction of α-amino acids with aldehydes in the presence of a cyanide source.
Investigation of a metal-free catalytic system.

Main Results:

Successful synthesis of α-amino nitriles via a decarboxylative pathway.
Demonstration of a transformation not requiring metal catalysts.
Access to α-amino nitriles not producible by traditional Strecker chemistry.

Conclusions:

The developed decarboxylative Strecker reaction offers a facile and metal-free method for synthesizing valuable α-amino nitriles.
This approach expands the synthetic utility of α-amino acids and aldehydes, providing access to previously inaccessible compounds.