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carbodiimide : ウィキペディア英語版 | carbodiimide
A carbodiimide or a methanediimine is a functional group consisting of the formula RN=C=NR. Carbodiimides hydrolyze to form ureas, which makes them uncommon in nature. From the perspective of small molecule activation, carbodiimides are isoelectronic with carbon dioxide. ==Carbodiimide formation== Carbodiimides are formed by dehydration of ureas or from thioureas. They are also formed by treating organic isocyanates with suitable catalysts (generally based on phosphine oxides); in this process, carbon dioxide evolves from the isocyanate.
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