2-[4-(Tri­fluoro­meth­yl)phen­yl]-1H-benzimidazole

In the title compound, C₁₄H₉F₃N₂, the mean planes of the benzimidazole ring system and the tri­fluoro­methyl-substituted benzene ring form a dihedral angle of 30.1 (1)°. In the crystal, mol­ecules are linked by N—H...N hydrogen bonds into chains along [010]. Weak C—H...F hydrogen bonds and a weak C—H...π inter­action connect the chains into a two-dimensional network parallel to (001).

Crystal structure of ethyl 5-(3-fluoro­phen­yl)-2-[(4-fluoro­phen­yl)methyl­idene]-7-methyl-3-oxo-2H,3H,5H-[1,3]thia­zolo[3,2-a]pyrimidine-6-carboxyl­ate

In the title mol­ecule, C₂₃H₁₈F₂N₂O₃S, the pyrimidine ring is in a half-chair conformation and the 3-fluoro­phenyl group is in the axial position. The thia­zole ring (r.m.s. deviation = 0.0252 Å) forms dihedral angles of 84.8 (7) and 9.6 (7)° with the 3-fluoro-substituted and 4-fluoro-substituted benzene rings, respectively. In the crystal, weak C—H...F and C—H...O hydrogen bonds connect mol­ecules, forming zigzag chains along the b axis. In addition π–π stacking inter­actions with a centroid–centroid distance of 3.7633 (9) Å connect these chains into ladders via inversion-related 4-fluoro­phenyl groups.