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From Wikipedia, the free encyclopedia. Acetic anhydride, or ethanoic anhydride, is the chemical compound with the formula (CH 3 CO) 2 O. Commonly abbreviated Ac 2 O, it is the simplest isolable anhydride of a carboxylic acid and is widely used as a reagent in organic synthesis.ike most acid anhydrides, the carbonyl carbon of acetic anhydride is a potent electrophile as the leaving group for each carbonyl carbon (a carboxylate) is a good electron-withdrawing group.
acid anhydride (ÄnhÄªËdrÄªd, âdrÉd) [ key ], chemical compound that reacts with water to form an acid (see acids and bases). Anhydrides of inorganic acids are usually oxides of nonmetallic elements.Carbon dioxide, CO. The Columbia Electronic Encyclopedia, 6th ed. amide-amide amide, organic compound formed by reaction of an acid chloride, acid anhydride, or ester 2  ... anhydride-anhydride anhydride [Gr.,=without water], chemical compound formed by removing water, H2O, from ...