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The title compound, C13H12N6O, is a functionalized ditriazoloquinazoline with substituted eth­oxy and methyl groups attached at the 2-position of each triazole spacer. The fused-ring system is essentially planar [r.m.s. deviation = 0.016 (2) Å]. In the crystal, a weak C—H...N hydrogen bond connects the mol­ecules into a chain along [101].

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The title ketal, C12H14FNO3, crystallized with two independent molecules in the asymmetric unit. In each molecule the fused ring system is essentially planar [maximum deviations of 0.0169 (11) and 0.0402 (13) Å]. The mol­ecules are each hydrogen bonded across a center of inversion into a dimer; adjacent dimers are linked by another N—H...O hydrogen bond, forming a chain running along [100].

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In the title compound, C14H15NO, the torsion angle about the two Csp3 atoms adopts a partially eclipsed conformation [−61.5 (1)°]. The dihedral angle between the two rings is 48.1 (1)°. In the crystal, the mol­ecules are connected by O—H...N and N—H...O hydrogen bonds into zigzag chains running along [010]. One of the amino H atoms is not involved in hydrogen bonding.

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The dihedral angle between the two phenyl rings in the title compound, C15H17NO, is 52.9 (1)°. In the crystal, the mol­ecules are connected by O—H...N hydrogen bonds into centrosymmetric dimers. The amino H atom is not involved in hydrogen bonding.
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