5-Amino-1,2-dimethylimidazole

The determination of the structure of the title compound, C₅H₉N₃, provides the first geometrical data for 5-amino-4-unsubstituted imidazoles. The amino group is planar and inclined at 45 (3)° to the plane of the imidazole ring. The N3-C4 bond is slightly longer than that in imidazole and significantly longer than those in 5-nitroimidazoles. There is intermolecular hydrogen bonding between the amino substituents and the ring N atoms at position 3.

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