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Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Mechanism

Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Mechanism

Carboxylic acids react with alcohols to yield esters via an acid-catalyzed condensation reaction called Fischer esterification. This is a nucleophilic acyl substitution reaction that proceeds via a tetrahedral intermediate, where a water molecule is eliminated as the leaving group.

Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Overview

Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Overview

The Fischer esterification reaction was developed by the German chemist Emil Fischer in 1895. It is a condensation reaction between carboxylic acids and alcohols in an acidic medium to give esters and water.

β-Dicarbonyl Compounds via Crossed Claisen Condensations

β-Dicarbonyl Compounds via Crossed Claisen Condensations

Crossed Claisen condensations are base-promoted reactions between two different ester molecules producing β-dicarbonyl compounds. The reaction involving esters, with both containing α hydrogen, results in a mixture of four different products that are difficult to isolate. This reduces the synthetic utility of the reaction.

Acid Halides to Esters: Alcoholysis

Acid Halides to Esters: Alcoholysis

Alcoholysis is a nucleophilic acyl substitution reaction in which an alcohol functions as a nucleophile. Acid halides react with alcohol to produce esters. The mechanism proceeds in three steps:

Esters to β-Ketoesters: Claisen Condensation Mechanism

Esters to β-Ketoesters: Claisen Condensation Mechanism

Regular Claisen condensation involves the synthesis of β-ketoesters by combining identical ester molecules bearing two α hydrogens in the presence of an alkoxide base. The reaction commences with the deprotonation of the acidic α hydrogen by the base to form a resonance stabilized ester enolate. This nucleophilic ion then attacks the carbonyl center of another ester molecule to generate a tetrahedral alkoxide intermediate. Next, the expulsion of the alkoxide group from the...

Acid Halides to Ketones: Gilman Reagent

Acid Halides to Ketones: Gilman Reagent

Lithium dialkyl cuprate, also known as Gilman reagents, selectively reduces acid halides to ketones. The acid chloride is treated with Gilman reagent at −78 °C in the presence of ether solution to produce a ketone in good yield.
As shown below, the mechanism proceeds in two steps. First, one of the alkyl groups of the reagent acts as a nucleophile and attacks the acyl carbon of the acid chloride to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen...

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High-valent Cu(III)-CF₃ compound-mediated esterification reaction.

Ming-Suo Dai¹, Zhen-Mei Zheng¹, Song-Lin Zhang^1,2

¹School of Chemistry and Chemical Engineering, Xinjiang Agricultural University, Urumqi 830052, Xinjiang, China.

Organic & Biomolecular Chemistry

|January 5, 2023

Summary

This summary is machine-generated.

Copper(III)-trifluoromethane (CF₃) compounds are new coupling reagents for synthesizing esters from carboxylic acids and alcohols. This method efficiently activates carboxylic acids without transferring CF₃ groups to products.

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Synthesis of Esters Via a Greener Steglich Esterification in Acetonitrile

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Area of Science:

Organic Chemistry
Synthetic Chemistry

Background:

Ester synthesis is crucial in organic chemistry.
Developing novel coupling reagents is essential for efficient synthesis.

Purpose of the Study:

To introduce novel Copper(III)-trifluoromethane (CF₃) compounds as coupling reagents.
To demonstrate their utility in ester synthesis.

Main Methods:

Utilizing Cu(III)-CF₃ compounds to mediate ester formation.
Transforming carboxylic acids into activated trifluoromethyl ester and acyl fluoride species.

Main Results:

Successful ester synthesis from carboxylic acids and alcohols/phenols.
Demonstrated broad substrate scope and late-stage applicability.
Achieved ester synthesis without CF₃ group transfer to products.

Conclusions:

Cu(III)-CF₃ compounds are effective and versatile coupling reagents for ester synthesis.
This methodology offers new possibilities for synthetic transformations involving Cu(III)-CF₃ species.