Esters are a class of organic compounds that result from the reaction of water with acids; they are commonly derived from carboxylic acids. German chemist Leopold Gmelin introduced the term ester in the first half of the 19th century. Carboxylic acid esters, represented by the formula RCOOR', are typically created through the reaction of carboxylic acids and alcohols, using hydrochloric or sulfuric acid in a process known as esterification. The hydroxyl group (OH) of the carboxylic acid is replaced by the alkoxy group (R'O) of the alcohol during this reaction. Low molecular weight carboxylic acid esters are colorless, volatile liquids that have pleasant odors and are slightly soluble in water. Many contribute to the fragrance and flavor of flowers and fruits; for example, isopentyl acetate can be found in bananas, methyl salicylate in wintergreen, and ethyl butyrate in pineapples.

How are esters formed?

Esters are organic compounds that react with water to produce alcohols and organic or inorganic acids. Carboxylic acid esters, the most common type, have the formula RCOOR', where R and R' represent organic combining groups. Carboxylic acid esters are commonly produced through the reaction of carboxylic acids and alcohols, a process known as esterification . This reaction typically occurs in the presence of hydrochloric or sulfuric acid. During esterification, the hydroxyl group (OH) of the carboxylic acid is replaced by the alkoxy group (R'O) of the alcohol.

What elements or groups make up an ester?

Esters are a class of organic compounds that react with water to produce alcohols and organic or inorganic acids. Carboxylic acid esters have the formula RCOOR′, where R and R′ represent any organic combining groups. Carboxylic acid esters are commonly produced through the reaction of carboxylic acids and alcohols, using hydrochloric or sulfuric acid as a catalyst, in a process called esterification. During this reaction, the hydroxyl group (OH) of the carboxylic acid is replaced by the alkoxy group (R′O) from the alcohol.

What are some common uses of esters?

Esters, organic compounds reacting with water to produce alcohols and organic or inorganic acids, have varied applications. Uses of esters: * Fragrances and flavorings Many low molecular weight esters are volatile liquids with pleasant odors and are used in synthetic flavors , perfumes , and cosmetics. * Solvents Certain volatile esters serve as solvents for lacquers, paints, and varnishes. * Polymers Esters include industrially important polymers . Polymethyl methacrylate is a glass substitute, and polyethylene terephthalate is used as film and textile fibers. * Other uses Phosphate esters are used as solvents, plasticizers, flame retardants, gasoline and oil additives, and insecticides. Esters of sulfuric and sulfurous acids are used in the manufacture of dyes and pharmaceuticals. * Saponification Hydrolysis of esters in the presence of alkalies is utilized in the preparation of soaps from fats and oils and is also used for the quantitative estimation of esters. * Industrial solvents Simple esters such as ethyl acetate and butyl acetate are used industrially as solvents, for example, in nail polish remover.

Why do esters often have pleasant scents?

Esters often exhibit pleasant scents due to their molecular structure and properties. Many low molecular weight carboxylic acid esters are colorless, volatile liquids. Unlike carboxylic acids, esters typically have sweet and pleasant odors, which contribute to the fragrances and flavors of various flowers and fruits. For example, isopentyl acetate is found in bananas, methyl salicylate in wintergreen, and ethyl butyrate in pineapples. These volatile esters are used in perfumes, cosmetics, and synthetic flavorings.

How are esters named in chemistry?

Esters, organic compounds that react with water to produce alcohols and organic or inorganic acids, are typically named using the names of the parent carboxylic acids. The naming conventions depend on whether common or International Union of Pure and Applied Chemistry (IUPAC) nomenclature is used. For both IUPAC and common names of esters, the alkyl or aryl group bonded to oxygen is named first, followed by the name of the acid, in which the suffix -ic acid is replaced by -ate . For example, ethyl ester yields ethyl alcohol on hydrolysis.

ester

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A detailed cross-section illustration of a low-density lipoprotein (LDL) complex shows a spherical structure with a phospholipid monolayer, embedded apoprotein (apoB-100), and internal components such as cholesteryl esters, free cholesterol, and triacylglycerol molecules.

Detailed diagram showing the transport of lipoproteins in the human body, illustrating how dietary fats and cholesterol are absorbed in the small intestine, packaged into chylomicrons, and transported through lymphatic vessels and the bloodstream. The diagram traces the conversion of chylomicrons to VLDL, IDL, LDL, and HDL particles, highlighting their roles in fat and cholesterol delivery, storage, and recycling, with labeled pathways to the liver, muscle, and adipose tissue, and includes cellu

Diagram showing common functional groups in monomers-amine, carboxylic acid, alcohol, and isocyanate-at the top, and their resulting polymer linkages-amide, ester, and carbamate (urethane)-at the bottom, with color-coded chemical structures and connecting lines illustrating how monomers combine during polymerization.

Diagram showing the hydrolysis of an ester, where methyl acetate reacts with water to produce acetic acid and methanol, with molecular structures and chemical formulas illustrated.

Quick Facts

Key People:: Louis-Jacques Thenard

Related Topics:: Acetylcholine; orotate; glyoxylate; lactate; lactide

On the Web:: IOPscience - IOP Conference Series: Earth and Environmental Science - Research Progress in the Synthesis of Esters (PDF) (Oct. 16, 2026)

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ester

chemical compound

Also known as: carboxylic ester

Written and fact-checked by

Britannica Editors

Last updated

Oct. 16, 2026 •History

Top Questions

What is an ester?
Esters are a class of organic compounds that result from the reaction of water with acids; they are commonly derived from carboxylic acids. German chemist Leopold Gmelin introduced the term ester in the first half of the 19th century.

Carboxylic acid esters, represented by the formula RCOOR', are typically created through the reaction of carboxylic acids and alcohols, using hydrochloric or sulfuric acid in a process known as esterification. The hydroxyl group (OH) of the carboxylic acid is replaced by the alkoxy group (R'O) of the alcohol during this reaction.

Low molecular weight carboxylic acid esters are colorless, volatile liquids that have pleasant odors and are slightly soluble in water. Many contribute to the fragrance and flavor of flowers and fruits; for example, isopentyl acetate can be found in bananas, methyl salicylate in wintergreen, and ethyl butyrate in pineapples.
3 Britannica Sources
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How are esters formed?
Esters are organic compounds that react with water to produce alcohols and organic or inorganic acids. Carboxylic acid esters, the most common type, have the formula RCOOR', where R and R' represent organic combining groups.

Carboxylic acid esters are commonly produced through the reaction of carboxylic acids and alcohols, a process known as esterification. This reaction typically occurs in the presence of hydrochloric or sulfuric acid. During esterification, the hydroxyl group (OH) of the carboxylic acid is replaced by the alkoxy group (R'O) of the alcohol.
3 Britannica Sources
Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
What elements or groups make up an ester?
Esters are a class of organic compounds that react with water to produce alcohols and organic or inorganic acids. Carboxylic acid esters have the formula RCOOR′, where R and R′ represent any organic combining groups.

Carboxylic acid esters are commonly produced through the reaction of carboxylic acids and alcohols, using hydrochloric or sulfuric acid as a catalyst, in a process called esterification. During this reaction, the hydroxyl group (OH) of the carboxylic acid is replaced by the alkoxy group (R′O) from the alcohol.
3 Britannica Sources
Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
What are some common uses of esters?
Esters, organic compounds reacting with water to produce alcohols and organic or inorganic acids, have varied applications.

Uses of esters:
* Fragrances and flavorings Many low molecular weight esters are volatile liquids with pleasant odors and are used in synthetic flavors, perfumes, and cosmetics.
* Solvents Certain volatile esters serve as solvents for lacquers, paints, and varnishes.
* Polymers Esters include industrially important polymers. Polymethyl methacrylate is a glass substitute, and polyethylene terephthalate is used as film and textile fibers.
* Other uses Phosphate esters are used as solvents, plasticizers, flame retardants, gasoline and oil additives, and insecticides. Esters of sulfuric and sulfurous acids are used in the manufacture of dyes and pharmaceuticals.
* Saponification Hydrolysis of esters in the presence of alkalies is utilized in the preparation of soaps from fats and oils and is also used for the quantitative estimation of esters.
* Industrial solvents Simple esters such as ethyl acetate and butyl acetate are used industrially as solvents, for example, in nail polish remover.
2 Britannica Sources
1. ester
2. carboxylic acid: Properties
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Why do esters often have pleasant scents?
Esters often exhibit pleasant scents due to their molecular structure and properties. Many low molecular weight carboxylic acid esters are colorless, volatile liquids. Unlike carboxylic acids, esters typically have sweet and pleasant odors, which contribute to the fragrances and flavors of various flowers and fruits.

For example, isopentyl acetate is found in bananas, methyl salicylate in wintergreen, and ethyl butyrate in pineapples. These volatile esters are used in perfumes, cosmetics, and synthetic flavorings.
4 Britannica Sources
Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
How are esters named in chemistry?
Esters, organic compounds that react with water to produce alcohols and organic or inorganic acids, are typically named using the names of the parent carboxylic acids. The naming conventions depend on whether common or International Union of Pure and Applied Chemistry (IUPAC) nomenclature is used.

For both IUPAC and common names of esters, the alkyl or aryl group bonded to oxygen is named first, followed by the name of the acid, in which the suffix -ic acid is replaced by -ate. For example, ethyl ester yields ethyl alcohol on hydrolysis.
6 Britannica Sources
Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

ester, any of a class of organic compounds that react with water to produce alcohols and organic or inorganic acids. Esters derived from carboxylic acids are the most common. The term ester was introduced in the first half of the 19th century by German chemist Leopold Gmelin.

Carboxylic acid esters, formula RCOOR′ (R and R′ are any organic combining groups), are commonly prepared by reaction of carboxylic acids and alcohols in the presence of hydrochloric acid or sulfuric acid, a process called esterification. In the reaction the hydroxyl group (OH) of the carboxylic acid is replaced by the alkoxy group (R′O) of the alcohol. Alcohol. Ester. Chemical Compounds. Fischer esterification is characterized by the combining of an alcohol and an acid (with acid catalysis) to yield an ester plus water.

The reverse of the esterification reaction is an example of hydrolysis. Esters may also be obtained by reaction of acid halides or acid anhydrides with alcohols or by reaction of salts of carboxylic acids with alkyl halides. One ester may be converted to another ester by reaction (transesterified) with an alcohol, a carboxylic acid, or a third ester in the presence of a catalyst.

ester

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