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Esters to Carboxylic Acids: Saponification

Esters to Carboxylic Acids: Saponification

Esters can be hydrolyzed to carboxylic acids under acidic or basic conditions. Base-promoted hydrolysis of esters is a nucleophilic acyl substitution reaction in which esters react with an aqueous base, followed by an acid to give carboxylic acids. This reaction is also known as saponification because it forms the basis for making soaps from fats.
The reaction requires a base in stoichiometric amounts, which participates in the reaction and is not regenerated later. So, the base acts as a...

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...

Alkylation of β-Ketoester Enolates: Acetoacetic Ester Synthesis

Alkylation of β-Ketoester Enolates: Acetoacetic Ester Synthesis

Acetoacetic ester synthesis is a method to obtain ketones from alkyl halides and β-keto esters. The reaction occurs in the presence of an alkoxide base that abstracts the acidic proton of the β-keto esters. The step results in an enolate ion which is doubly stabilized. The enolate then reacts with an alkyl halide via the SN2 process to produce an alkylated ester intermediate with a new C–C bond. The hydrolysis of the intermediate, followed by acidification, results in an...

Alkylation of β-Diester Enolates: Malonic Ester Synthesis

Alkylation of β-Diester Enolates: Malonic Ester Synthesis

Malonic ester synthesis is a method to obtain α substituted carboxylic acids from ꞵ-diesters such as diethyl malonate and alkyl halides.

Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis

Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis

Hydrolysis of esters under acidic conditions proceeds through a nucleophilic acyl substitution. In the presence of excess water, the reaction proceeds in a reversible manner, forming carboxylic acids and alcohols.
During hydrolysis, the ester is first activated towards nucleophilic attack through the protonation of the carboxyl oxygen atom by the acid catalyst. The protonation makes the ester carbonyl carbon more electrophilic. In the next step, water acts as a nucleophile and adds to the...

Esters to β-Ketoesters: Claisen Condensation Overview

Esters to β-Ketoesters: Claisen Condensation Overview

Regular Claisen condensation is a base-promoted reaction involving identical esters with two α hydrogens, condensing to produce β-ketoesters. It is a nucleophilic acyl substitution reaction wherein one of the ester molecules, upon deprotonation by the base, forms a nucleophilic enolate ion, while the other molecule serves as an electrophile.

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Updated: Jan 18, 2026

Author Spotlight: Employing Green-Chemistry Principles for Safe and Sustainable Synthesis of Biodiesels

Author Spotlight: Employing Green-Chemistry Principles for Safe and Sustainable Synthesis of Biodiesels

Published on: April 19, 2024

Enzymatic transesterification for biodiesel production.

Shweta Shah¹, Shweta Sharma, M N Gupta

¹Chemistry Department, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi 110 016, India.

Indian Journal of Biochemistry & Biophysics

|August 21, 2012

Summary

This summary is machine-generated.

Biodiesel, a green fuel derived from vegetable oils, can be produced using enzymatic transesterification. Immobilized enzymes offer a cost-effective and reusable solution for sustainable biodiesel production.

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Experimental Protocol for Biodiesel Production with Isolation of Alkenones as Coproducts from Commercial Isochrysis Algal Biomass

Experimental Protocol for Biodiesel Production with Isolation of Alkenones as Coproducts from Commercial Isochrysis Algal Biomass

Published on: June 24, 2016

Area of Science:

Biotechnology
Green Chemistry
Renewable Energy

Background:

Biodiesel is a sustainable fuel alternative to petroleum diesel, produced from vegetable oils or fats.
Current production methods include chemical transesterification and lipase-catalyzed transesterification using methanol or ethanol.
Biodiesel is compatible with existing engine designs and storage infrastructure.

Purpose of the Study:

To explore the advantages of enzymatic transesterification for biodiesel production.
To address the cost challenges associated with enzyme usage in biodiesel synthesis.
To discuss strategies for optimizing enzymatic alcoholysis using non-aqueous enzymology.

Main Methods:

Lipase-catalyzed transesterification of vegetable oils with methanol or ethanol.
Enzyme immobilization techniques for reusability and cost reduction.
Application of non-aqueous enzymology principles for process enhancement.

Main Results:

Enzymatic transesterification offers environmental benefits over chemical routes.
Immobilized enzymes provide a viable strategy to overcome enzyme cost barriers.
Various non-aqueous enzymology approaches can be leveraged for efficient biodiesel synthesis.

Conclusions:

Enzymatic biodiesel production is a promising green alternative.
Enzyme immobilization and non-aqueous enzymology are key to cost-effective and sustainable biodiesel.
Further research into technical challenges can optimize enzymatic biodiesel production.