カルバモイルメラミン合成法の改良 : シアナミド誘導体に関する研究 (第85報)

概要

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An improved method was proposed for the preparation of carbamoylmelamine (1). Salts of 1 were obtained by the methanolysis of 2, 4-diaminotriazinylchloro-formamidinium chloride, or by the acid hydration of cyanomelamine (2). It was observed that the hydration of (2) occurred in 2<I>N</I>-mineral acids at 80°C, however in hydrochloric acid ammeline (3) hydrochloride was given as main product. On the other hand, in nitric acid (1) nitrate was formed in a good yield as pure precipitates directly, since (1) nitrate was less soluble than its hydrochloride. Under the best reaction conditions, (1) nitrate was obtained in 82% yield. It was concluded that the hydration of (2) with nitric acid was applicable to the simplified method for preparation of (1).
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