Abstract
Abstract The formation of biuret from urea has been studied kinetically in 2-methoxyethanol at 120° by estimating the formed biuret with visible spectrophotometry. The apparent second-order rate constant decreases with proceeding of the reaction and with increasing the initial concentration of urea and ammonia. The addition of ammonia is effective in improving the constancy of apparent second-order rate constants. The reaction is subject to the base catalysis, where imidazole is more effective than triethylamine (a stronger base) or N-methylimidazole. The kinetic data are explicable by a mechanism involving the decomposition of urea to ammonia and isocyanic acid followed by the base-catalysed addition of the latter to urea.
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