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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.
The simplest acid anhydrides to describe are those in which R 1 = R 2 =  an alkane less the hydrogen atom at the end of the chain , where the hydrogen atom at the end of the corresponding alkane is replaced by the carbon atom to which that R (so, R 1 or R 2 in the diagram above) is attached. series of linear acid anhydrides is shown below with the molecular structure of each acid anhydride in the series drawn out in full (showing bond types but not accurate bond angles or, therefore, realistic molecular shapes).