ester, any one of a group of organic compounds with general formula RCO₂R′ (where R and R′ are alkyl groups or aryl groups) that are formed by the reaction between an alcohol and an acid. For example, when ethanol and acetic acid react, ethyl acetate (an ester) and water are formed; the reaction is called esterification. Ethyl acetate acetate (ăs`ĭtāt'), one of the most important forms of artificial cellulose-based fibers; the ester of acetic acid.
..... Click the link for more information. is used as a solvent. Methyl acetate, formed by the reaction between methanol and acetic acid, is a sweet-smelling liquid used in making perfumes, extracts, and lacquers. Esters react with water (hydrolysis hydrolysis (hīdrŏl`ĭsĭs)
..... Click the link for more information. ) under basic conditions to form an alcohol and an acid. When heated with a hydroxide certain esters decompose to yield soap and glycerin; the process is called saponification. Common fats and oils fats and oils, group of organic substances that form an important part of the diet and also are useful in many industries. The fats are usually solid, the oils generally liquid at ordinary room temperatures.
..... Click the link for more information. are mixtures of various esters, such as stearin stearin (stēr`ĭn), fat that is the triglyceride of stearic acid, CH₃(CH₂)₁₆CO₂H, i.e.
..... Click the link for more information. , palmitin palmitin (păl`mətĭn), fat that is the triglyceride of palmitic acid, CH₃(CH₂)₁₄CO₂
..... Click the link for more information. , and linolein, formed from the alcohol glycerol glycerol, glycerin, glycerine, or 1,2,3-propanetriol
..... Click the link for more information. and fatty acids fatty acid, any of the organic carboxylic acids present in fats and oils as esters of glycerol . Molecular weights of fatty acids vary over a wide range. The carbon skeleton of any fatty acid is unbranched. Some fatty acids are saturated, i.e.
..... Click the link for more information. . Naturally occurring esters of organic acids in fruits and flowers give them their distinctive odors. Esters perform important functions in the animal body; e.g., the ester acetylcholine is a chemical transmitter of nerve stimuli.

ester

Any of a class of organic compounds that can react with water (see hydrolysis) to produce an alcohol and an organic or inorganic acid. They are formed by the reverse process, esterification, in which acid reacts with alcohol to form an ester and water. Esters of carboxylic acids, the most common esters, contain the acid's carbonyl group (−C=O; see functional group); the carbon's fourth bond is with the alcohol's oxygen atom. Hydrolysis of esters in the presence of an alkali (saponification) is used to make soaps from fats and oils. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours; they give flavour and fragrance to fruits and flowers and are used as synthetic flavours and fragrances. Others, such as ethyl acetate and butyl acetate, are used as solvents for lacquers, paints, and varnishes. Certain polymers are esters, including Lucite (polymethyl methacrylate) and Dacron (polyethylene terephthalate). Esters of alcohols and inorganic acids include nitrate esters (e.g., nitroglycerin), which are explosive; phosphate esters, including such biologically important compounds as nucleic acids; and others that are used as flame retardants, solvents, plasticizers, gasoline and oil additives, and insecticides.

ester (redirected from Ester bond)

ester

ester
(redirected from Ester bond)