Cyanuric Acid

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cyanuric acid

[¦sī·ə¦nu̇r·ik ′as·əd]
(organic chemistry)
HOC(NCOH)2N·2H2O Colorless, monoclinic crystals, slightly soluble in water; formed by polymerization of cyanic acid. Also known as pyrolithic acid.

Cyanuric Acid


(formula I), a cyclic trimer of cyanic acid; a colorless crystalline compound, which is soluble in hot water and alcohol.

Upon heating to 150°C, cyanuric acid depolymerizes without melting. Upon the action of alkalies, it forms monobasic, dibasic, and tribasic salts. In some of its reactions, for example, with diazomethane, it reacts in its tautomeric form—isocyanuric acid (II). Cyanuric acid may be produced by heating urea, as well as by other methods. The triamine derivatives of cyanuric acid— melamines—are of industrial importance, mainly in the production of melamine-formaldehyde resins. The acid-chloride derivative of cyanuric acid—cyanuric chloride—is also of industrial importance.