1-(2,6-Diiso­propyl­phen­yl)-1H-benzimidazole

In the title compound, C₁₉H₂₂N₂, both the benzimidazole unit and the 2,6-diiso­propyl­phenyl group are essentially planar [maximum deviations from the least-squares planes of 0.005 (1) and 0.009 (1) Å, respectively]. The dihedral angle between the two planes is 79.6 (7)°. In the crystal, mol­ecules are linked into chains along the a-axis direction by weak C—H...N inter­actions. The crystal structure also features C—H...π inter­actions, which link the chains into a three-dimensional network.

N-p-Tolyl-1,3-selenazolo[5,4-b]pyridin-2-amine

In the title compound, C₁₃H₁₁N₃Se, the dihedral angle between the mean plane of the fused seleno­azolo­pyridine ring system and the p-toluidine ring is 14.260 (5)°. In the crystal, mol­ecules are linked by N—H...N hydrogen bonds, forming zigzag chains extending along the b-axis direction.

Ethyl 8-(2,4-di­chloro­phen­yl)-6-methyl-1,2,4-triazolo[1,5-a]pyridine-7-carboxyl­ate

In the title compound, C₁₆H₁₃Cl₂N₃O₂, the carboxyl­ate group and the benzene ring attached to the central 1,2,4-triazolo[1,5-a]pyridine bicycle are twisted from its mean plane by 55.6 (1) and 72.6 (1)°, respectively. In the crystal, weak C—H...O inter­actions link the mol­ecules into zigzag chains propagating in [100].

Ethyl 6-methyl-8-phenyl-1,2,4-triazolo[1,5-a]pyridine-7-carboxyl­ate

In title compound, C₁₆H₁₅N₃O₂, the 1,2,4-triazolo[1,5-a]pyridine ring system is almost planar (r.m.s. deviation = 0.0068 Å) and forms a dihedral angle of 61.4 (3)° with the phenyl ring. In the structure, centrosymmetrically related mol­ecules are linked into dimers by pairs of C—H...N hydrogen bonds.