A manipulatively simple and facile one-pot procedure for the synthesis of symmetrical
anhydride is reported. Treatment of carboxylic acids with tosyl chloride in K2CO3 media under solvent free conditions gives the corresponding anhydrides in good to
excellent yields in a short reaction time via carboxylic sulfonic anhydride as the
key intermediate.
anhydrides - tosyl chloride - grinding - carboxylic acid