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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 Definition: An acid anhydride is a nonmetal oxide which reacts with water to form an acidic solution. In organic chemistry, an acid anhydride is a functional group consisting of two acyl groups joined together by an oxygen atom.Acid anhydride also refers to compounds containing the acid anhydride functional group. Acid anhydrides are named from the acids that created them.n organic chemistry, an acid anhydride is a functional group consisting of two acyl groups joined together by an oxygen atom. Acid anhydride also refers to compounds containing the acid anhydride functional group. Acid anhydrides are named from the acids that created them.