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Many of these methods, however, suffer from drawbacks including use of ex-pensive and/or toxic reagents, low yields, tedious workup pro-cedures, harsh reaction conditions and incompatibility with poly-functionalized substrates. Therefore, mild and efficient methods for preparing carboxylic acid anhydrides are still in great demand.Organic reactions employing indium metal have gained considerable attention because indium-mediated reactions show high reactivity and unique properties in organic or aqueous medium.

Synthesis of Symmetrical Carboxylic Acid Anhydrides from Acyl Chlorides in the Presence of In Metal and DMF