Abstract
An efficient and convenient procedure for the synthesis of symmetrical carboxylic anhydrides from carboxylic acids with sulfated zirconia by PEG-1000 phase transfer catalysis has been developed. The reactions proceeded under mild and solvent-free conditions to provide the carboxylic anhydrides in good to excellent yields. The product can be isolated by a simple extraction with organic solvent, and the catalyst system can be recycled or reused without any significant loss of catalytic activity. KEY WORDS : Carboxylic anhydrides, Carboxylic acids, SO 4 2- /ZrO 2 , Phase transfer catalysis Bull. Chem. Soc. Ethiop. 2011 , 25(2), 255-262.
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