1,3-Bis(prop-2-yn-1-yl)-1H-anthra[1,2-d]imidazole-2,6,11(3H)-trione

In the title compound, C₂₁H₁₂N₂O₃, the fused-ring system is roughly planar, the largest deviation from the mean plane being 0.084 (2) Å. The two prop-2-yn-1-yl groups are almost perpendicular to the fused ring plane, making C—C—N—C torsion angles of −103.4 (2) and −105.3 (2)°, and point in opposite directions with respect to the plane. In the crystal, mol­ecules are linked by weak C—H...O hydrogen bonds, forming a three-dimensional network.

3-Benzyl-6-bromo-1H-imidazo[4,5-b]pyridin-2(3H)-one

The fused imidazole and pyridine rings in the title compound, C₁₃H₁₀BrN₃O, are linked to a benzyl group. The fused ring system is essentially planar, the largest deviation from the mean plane being 0.006 (2) Å. The phenyl ring is not coplanar with the fused ring system, as indicated by the dihedral angle of 67.04 (12)°. In the crystal, mol­ecules are linked by pairs of N—H...O hydrogen bonds, forming inversion dimers.

6-Bromo-1,3-bis­[(1,3-dioxolan-2-yl)meth­yl]-1H-imidazo[4,5-b]pyridin-2(3H)-one

In the title compound, C₁₄H₁₆BrN₃O₅, the N atoms adjacent to the carbonyl group in the five-membered ring are substituted by (1,3-dioxolan-2-yl)methyl groups. The fused ring system is essentially planar, with the largest deviation from the mean plane being 0.014 (2) Å for the C atom bearing the Br atom. The first oxolane ring, attached on the side of the N atom belonging to the pyridine ring, has an envelope conformation with one of the O atoms as the flap, whereas the second oxolane ring displays a twisted boat conformation. The two oxolane rings display envelope and twisted boat conformations. In the crystal, mol­ecules are linked by C—H...O hydrogen bonds, building chains parallel to the a-axis direction.

3-Benzyl-1-{[3-(4-chloro­phen­yl)isoxazol-5-yl]meth­yl}-1H-benzimidazol-2(3H)-one

In the title compound, C₂₄H₁₈ClN₃O₂, the benzimidazole plane is nearly perpendicular to the phenyl ring and to the isoxazole ring, making dihedral angles of 75.95 (7) and 73.04 (8)°, respectively, but the two residues point in opposite directions with respect to the benzimidazole plane. The dihedral angle between the chloro­phenyl and isoxazole rings is 7.95 (8)°. In the crystal, mol­ecules are linked by pairs of C—H...O hydrogen bonds into inversion dimers.

1-Allyl-3-benzyl-1H-benzimidazol-2(3H)-one

In the title compound, C₁₇H₁₆N₂O, the fused benzimidazol-2(3H)-one system is essentially planar, the largest deviation from the mean plane being 0.006 (2) Å for the carbonyl C atom. Its mean plane is almost perpendicular to the benzyl plane and to the allyl group, making dihedral angles of 80.6 (1) and 77.4 (3)°, respectively. The benzyl group and the allyl subsituent lie on opposite sides of the fused ring system. In the crystal, mol­ecules are linked by bifurcated C—H...O hydrogen bonds in which the carbonyl O atom acts as accepter to two aromatic C—H groups, forming a two-dimensional network parallel to (001).