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Acetic Anhydride | C4H6O3 | CID 7918 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards/toxicity information, supplier lists, and more. Acetic anhydride is a colorless liquid that smells like acetic acid and is widely used in organic synthesis. Learn about its structure, properties, production, uses, hazards, and history from this comprehensive article. Acetic anhydride is a carboxylic acid anhydride commonly used for the acetylation of amines and alcohols. [1] It undergoes exothermic reaction on addition of water to form acetic acid. [2] A clear colorless liquid with a strong odor of vinegar, used to make fibers, plastics, pharmaceuticals, dyes, and explosives. Reacts violently with water, acids, and oxidizing reagents, and causes severe burns and irritation on contact.