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Updated: May 27, 2026

Preparation of N-(2-alkoxyvinyl)sulfonamides from N-tosyl-1,2,3-triazoles and Subsequent Conversion to Substituted Phthalans and Phenethylamines
Published on: January 3, 2018
Ethyl 5-methyl-1-(4-nitro-phen-yl)-1H-1,2,3-triazole-4-carboxyl-ate
Abstract:
In the title compound, C(12)H(12)N(4)O(4), the 1,2,3-triazole ring and the nitro group form dihedral angles of 37.93 (5) and 8.97 (12)°, respectively, with the phenyl ring. The mol-ecular structure is stabilized by an intra-molecular C-H⋯O hydrogen bond, which generates an S(6) ring motif. In the crystal, mol-ecules are linked by C-H⋯N hydrogen bonds into layers lying parallel to (100). The crystal structure is further consolidated by π-π [centroid-centroid distance = 3.6059 (6) Å] inter-actions.
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The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by water loss...

