Abstract
A novel and facile synthesis of carboxylic anhydrides from carboxylic acid using 4,5-dichloro-2-[(4-nitrophenyl)sulfonyl]pyridazin-3(2H)-one (2) is presented. Treatment of aliphatic or aromatic carboxylic acids with 2 in the presence of base in organic solvents gave the corresponding anhydrides in good or excellent yields
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