Ester - translation to french
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Ester - translation to french

CHEMICAL COMPOUNDS CONSISTING OF A CARBONYL ADJACENT TO AN ETHER LINKAGE
Esterification; Esters; Esterfication; Esterified; Ester compound; Phosphoric ester; Carboxylate ester; Ethyl ester; Methyl ester; Carboxylic ester; Ester bond; Carboxylic acid ester; COOR; CO2R; Diester; Monoester; Ester linkage; Ester hydrolysis; Ester group; Esterolysis; RCOOR'; RCOOR; Natural esters; Synthetic esters; Diesters; Triester; Alkyl carboxylate
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  • An ester of [[carboxylic acid]]. R stands for any group (organic or inorganic) and R′ stands for [[organyl]] group.
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  • <span style="color:blue;">'''oleic acid'''</span>]] (top right).

Ester         
n. Ester, woman's name
introuvé      
non est, is not (Latin)
arséniate         
n. arsenate, salt or ester of arsenic

Definition

Ester
·noun An ethereal salt, or compound ether, consisting of an organic radical united with the residue of any oxygen acid, organic or inorganic; thus the natural fats are esters of glycerin and the fatty acids, oleic, ·etc.

Wikipedia

Ester

In chemistry, an ester is a compound derived from an acid (organic or inorganic) in which the hydrogen atom (H) of at least one acidic hydroxyl group (−OH) of that acid is replaced by an organyl group (−R). Analogues derived from oxygen replaced by other chalcogens belong to the ester category as well (i.e. esters of acidic −SH, −SeH, −TeH, −PoH and −LvH groups). According to some authors, organyl derivatives of acidic hydrogen of other acids are esters as well (e.g. amides), but not according to the IUPAC.

Glycerides are fatty acid esters of glycerol; they are important in biology, being one of the main classes of lipids and comprising the bulk of animal fats and vegetable oils. Lactones are cyclic carboxylic esters; naturally occurring lactones are mainly 5- and 6-membered ring lactones. Lactones contribute to the aroma of fruits, butter, cheese, vegetables like celery and other foods.

Esters can be formed from oxoacids (e.g. esters of acetic acid, carbonic acid, sulfuric acid, phosphoric acid, nitric acid, xanthic acid), but also from acids that do not contain oxygen (e.g. esters of thiocyanic acid and trithiocarbonic acid). An example of an ester formation is the substitution reaction between a carboxylic acid (R−C(=O)−OH) and an alcohol (R'OH), forming an ester (R−C(=O)−O−R'), where R stands for any group (organic or inorganic) and R′ stands for organyl group.

Organyl esters of carboxylic acids typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones. They perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Polyesters are important plastics, with monomers linked by ester moieties. Esters of phosphoric acid form the backbone of DNA molecules. Esters of nitric acid, such as nitroglycerin, are known for their explosive properties.

There are compounds in which an acidic hydrogen of acids mentioned in this article are not replaced by an organyl, but by some other group. According to some authors, those compounds are esters as well (e.g. according to them, trimethylstannyl acetate (or trimethyltin acetate) CH3COOSn(CH3)3 is a trimethylstannyl ester of acetic acid, and dibutyltin dilaurate (CH3(CH2)10COO)2Sn((CH2)3CH3)2 is a dibutylstannylene ester of lauric acid).

Examples of use of Ester
1. Il y a parmi nous des juristes, des avocats qui sont prêts à ester en justice, au nom de lassociation, tous les auteurs de dépassements, y compris les institutions de lEtat ", expliquera à la presse un des intervenants à ce débat qui ajoutera que " les Amis de Biskra est une association conviviale qui prône, avant tout, le dialogue et la concertation.
2. Ce collectif devait, par la suite, ester en justice le chef de lexécutif pour ce qui est considéré comme une atteinte au droit dinformer et ŕ celui de citoyen tout court, sachant que cette enceinte entoure également le si';ge de lAPW.
3. Actualite Apr';s la publication dun commentaire Benhadj veut ester le directeur dEl Watan en justice Le numéro 2 de lex–FIS, Ali Benhadj, sest déplacé hier ŕ la maison de la presse Tahar Djaout ŕ Alger afin de faire une mise au point ŕ El Watan pour un commentaire du journal, paru dans lédition du 14 mars sous le titre : " Des libérations qui choquent ". Le commentaire, écrit par le directeur de la publication, souligne quil est difficile de demander aux Algériens de solder les comptes dune période si cruelle, au moment oů " lun des principaux commanditaires du terrorisme et lun des principaux responsables des 150 000 morts, Ali Benhadj, nargue les Algériens, lEtat et la nation ". Accompagné de son fr';re, Ali Benhadj a exigé de voir en personne le directeur du journal.