One-pot Synthesis of Acid Anhydrides from Acids Using N,N,N′,N′-Tetramethylchloroformamidinium Chloride under Mild Conditions

Abstract
N,N,N′,N′-Tetramethylchloroformamidinium chloride reacted smoothly with a variety of carboxylic and phosphoric acids in the presence of a tertiary amine to give the corresponding acid anhydrides in high yields.