Abstract
Carboxylic acid anhydrides and chlorides react with 2-nitrophenylhydrazine to form the corresponding hydrazides. These hydrazides in aqueous basic solution give a blue color which can be utilized for colorimetric analysis. Both acid anhydrides and acid chlorides undergo this reaction in water, while only the acid chlorides react readily in acetonitrile. The use of acetonitrile as the solvent allows the analysis of acid chlorides in the presence of acid anhydrides. A variety of other carboxylic acid derivatives and carbonyl compounds gave no interference. Suggested analytical procedures for acid anhydrides and acid chlorides are given along with analytical data.
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