A Convenient Method for the Preparation of Acid Anhydrides from Metallic Carboxylates

Abstract
A convenient method for the preparation of carboxylic anhydrides by use of one mole of N,N′-dicyclohexylthiourea and two moles of silver or mercurous carboxylate has been established. According to this method, several carboxylic anhydrides were obtained in high yields under mild conditions even by microscale experiments.