1,3,5-Triazaadamantan-7-amine

1,3,5-Triaza­adamantan-7-amine

The title compound, C(7)H(14)N(4), represents the first structurally characterized, isolated triaza-adamantane. In the crystal structure, weak inter-molecular N-H⋯N hydrogen bonds link the mol-ecules into columns about the crystallographic fourfold axis.

1H-Pyrazolo[4,3-g]benzothia­zol-7-amine

The mol-ecule of the title compound, C(8)H(6)N(4)S, is almost planar [maximum deviation from the mean plane = 0.020 (1) Å for the S atom]. In the crystal, a supra-molecular three-dimensional arrangement arises from N-H⋯N hydrogen bonds and weak aromatic stacking interactions along the a axis [centroid-centroid separation = 3.582 (2) Å].

7-Chloro-1,2-dihydro­furo[2,3-c]isoquinolin-5-amine

In the title compound, C(11)H(9)ClN(2)O, the fused-ring system is essentially planar, with a maximum deviation of 0.0323 (16) Å. In the crystal, mol-ecules are connected by N-H⋯O hydrogen bonds forming a zigzag chain along the c axis. Mol-ecules are further stacked along the a axis through weak π-π inter-actions, the shortest distance between ring centroids being 3.6476 (8) Å.

6-(2,6-Dimethyl­phen­yl)pyrido[2,3-d]pyrimidin-7-amine

In the title compound, C(15)H(14)N(4), the pyrido[2,3-d]pyrimidine system is almost ideally planar (r.m.s. deviation 0.028 Å) with its mean plane almost orthogonal to the 2,6-dimethyl-phenyl plane. The dihedral angle formed by these planes [87.3 (2)°] is close to the predicted value (89.7°) obtained by mol-ecular-mechanics force-field calculations. Only one of the two active amine H atoms parti...

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