甲亚胺或亚甲亚胺是一种有机化合物,化学式为H
2C=NH,它是最简单的亚胺。它是无色气体,在地外被探测到。[1]经微波谱表征,其C=N键键长为1.27 Å,N-H键键长为1.02 Å,∠HNC为110.5°。[2]因为无位阻取代基的亚胺在较高浓度下会聚合,所以甲亚胺无法以液体或固体的形式分离开。尝试从氨和甲醛的反应合成甲亚胺只会得到六亚甲基四胺。[3]
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