1-(Benzotriazol-1-yl)-2-bromoethanone

In the title compound C₈H₆BrN₃O, the benzotriazole ring is essentially planar (r.m.s. deviation = 0.0034 Å) and the bromo­acetyl unit is twisted at a dihedral angle of 15.24 (16)° with respect to it. In the crystal, pairs of C—H...O hydrogen bondings result in the formation of inversion dimers, forming R₂²(12) rings, which are connected by further C—H...O inter­actions into chains extending along the b-axis direction.

1-(1H-1,2,3-Benzotriazol-1-yl)-2-(4-meth­oxy­phen­yl)ethanone

In the title compound, C₁₅H₁₃N₃O₂, the dihedral angle between the benzotriazole ring system (r.m.s. deviation = 0.0124 Å) and the benzene ring is 76.21 (3)°. The meth­oxy C atom deviates from its benzene ring plane by 0.063 (2)Å. In the crystal, inversion dimers linked by pairs of C—H...O hydrogen bonds generate R₂²(12) loops.