ester acid

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• ester — ESTÉR, esteri, s.m. Combinaţie organică rezultată prin eliminarea unei molecule de apă între un alcool şi un acid organic sau un acid anorganic oxigenat. – Din fr. ester. Trimis de LauraGellner, 13.06.2004. Sursa: DEX 98  estér s. m., pl. estéri …   Dicționar Român

• ester — [es′tər] n. [Ger, contr. < essigäther < essig, vinegar (< L acetum: see ACETO ) + äther (< L aether), ETHER] an organic compound, comparable to an inorganic salt: generally, HR (inorganic acid) +R1OH (alcohol) = RR1 (ester) + H2O… …   English World dictionary

• Ester pyrolysis — in organic chemistry is a vacuum pyrolysis reaction converting esters containing a β hydrogen atom into the corresponding carboxylic acid and the alkene. The reaction is an Ei elimination.Examples are the synthesis of acrylic acid from ethyl… …   Wikipedia

• Acid lipase disease — is a name used to describe two related disorders of fatty acid metabolism. Acid lipase disease occurs when the enzyme needed to break down certain fats that are normally digested by the body is lacking or missing, resulting in the toxic buildup… …   Wikipedia

• Ester — Es ter, n. [A word invented by L. Gmelin, a German chemist.] (Chem.) 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… …   The Collaborative International Dictionary of English

• ester — (n.) compound formed by an acid joined to an alcohol, 1852, coined in German in 1848 by German chemist Leoipold Gmelin (1788 1853), professor at Heidelberg. [A]pparently a pure invention [Flood], perhaps a contraction of or abstraction from… …   Etymology dictionary

• ester — ► NOUN Chemistry ▪ an organic compound made by replacing the hydrogen of an acid by an alkyl or other organic group …   English terms dictionary

• Ester — For other uses, see Ester (disambiguation). A carboxylic acid ester. R and R denote any alkyl or aryl group, respectively Esters are chemical compounds derived by reacting an oxoacid with a hydroxyl compound such as an alcohol or phenol …   Wikipedia

• ester — /es teuhr/, n. Chem. a compound produced by the reaction between an acid and an alcohol with the elimination of a molecule of water, as ethyl acetate, C4H8O2, or dimethyl sulfate, C2H6SO4. [1850 55; coined by L. Gmelin (1788 1853), German… …   Universalium

• Acid catalysis — In acid catalysis and base catalysis a chemical reaction is catalyzed by an acid or a base. The acid is often the proton and the base is often a hydroxyl ion. Typical reactions catalysed by proton transfer are esterfications and aldol reactions.… …   Wikipedia

• Acid value — In chemistry, acid value (or neutralization number or acid number or acidity ) is the mass of potassium hydroxide (KOH) in milligrams that is required to neutralize one gram of chemical substance. The acid number is a measure of the amount of… …   Wikipedia