2-(1H-1,2,3-Benzotriazol-1-yl)-N′-cyclopentylideneacetohydrazide

Ethyl 2-(1H-1,2,3-benzotriazol-1-yl)acetate

The title compound, C₁₀H₁₁N₃O₂, was synthesized by the reaction of 1H-benzotriazole with ethyl 2-chloro­acetate in ethanol. The non-H atoms, excluding the benzotriazol-1-yl group, are almost coplanar (r.m.s. deviation of the non-H atoms = 0.0409 Å). The dihedral angle formed between this plane and the benzotriazole ring is 79.12 (5)° In the crystal, weak inter­molecular C—H⋯N and C—H⋯O inter­actions help to consolidate the three-dimensional network.

2-(1H-Benzotriazol-1-yl)acetohydrazide

The title compound, C₈H₉N₅O, was synthesized by the reaction of ethyl 2-(benzotriazol-1-yl)acetate with hydrazine hydrate in ethanol. In the amide group, the C—N bond is relatively short [1.3283 (16) Å], suggesting some degree of electronic delocalization in the mol­ecule. In the crystal structure, mol­ecules are linked into infinite chains along the a axis by inter­molecular O—H⋯N hydrogen bonding.