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Published on: January 19, 2016
A new polymorph of 2-(2H-benzotriazol-2-yl)acetic acid
Guloy Alieva1, Jamshid Ashurov, Nasir Mukhamedov
1The Mirzo Ulugbek National University of Uzbekistan, Faculty of Chemistry, University Str. 6, Tashkent 100779, Uzbekistan.
Abstract:
A new polymorph of 2-(benzotriazol-2-yl)acetic acid, C(8)H(7)N(3)O(2), crystallizes in the space group C2/c (Z = 8). The non-planar mol-ecule has a synplanar conformation of the carb-oxy group. The crystal structure features helices parallel to the b axis sustained by O-H⋯N hydrogen bonding which are similar to those in the known polymorph [Giordano & Zagari (1978 ▶). J. Chem. Soc. Perkin Trans. 2, pp. 312-315]. However, in the title structure, columns are formed by π-π stacking inter-actions between benzotriazole fragments of centrosymmetrically related adjacent mol-ecules [centroid-centroid distances = 3.593 (10) and 3.381 (10) Å] whereas π-π stacking inter-actions are not observed in the other polymorph. In the crystal of the title compound, C-H⋯O inter-actions are also observed.
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Nomenclature of Carboxylic Acid Derivatives: Acid Halides, Esters, and Acid Anhydrides
The IUPAC and common names of acid halides are derived from the corresponding carboxylic acids, by changing “ic acid” to “yl halide.” For example, as shown below, the IUPAC name ethanoyl chloride is derived from ethanoic acid, and the common name, acetyl chloride, is obtained from acetic acid.
Structures of Carboxylic Acid Derivatives
Carboxylic acid derivatives contain an acyl group attached to a heteroatom such as chlorine, oxygen, or nitrogen. The carbonyl carbon and oxygen are both sp2-hybridized with an unhybridized p orbital.
The three sp2 orbitals of the carbonyl carbon form three σ bonds, one each with the carbonyl oxygen, the α carbon, and the heteroatom, whereas the other two sp2 orbitals of the carbonyl oxygen are occupied by the lone pairs. Further, the unhybridized p...
IUPAC Nomenclature of Aldehydes
IUPAC Nomenclature of Carboxylic Acids
For acyclic saturated monocarboxylic acids, the longest hydrocarbon chain containing the –COOH carbon is identified as the parent chain. Then, the last -e of the parent hydrocarbon name is replaced with a suffix -oic acid.

