organic compounds
Open access
The title compound, C9H8N2O3, was prepared by reaction of phenol, glyoxylic acid and urea in water. The imidazolidine ring adopts an almost planar conformation (r.m.s. deviation = 0.012 Å) and is twisted by 89.3 (1)° relative to the benzene ring. In the crystal, molecules are linked by N—HO and O—HO hydrogen bonds into a three-dimensional framework.
data reports
Open access
The title compound, 2C9H9N3·HClO4, was prepared by reaction of 1-benzyl-1H-1,2,4-triazole and HClO4 in ethanol at room temperature. The asymmetric unit consists of two molecules of 1-benzyl-1H-1,2,4-triazole and one of HClO4 molecule. The benzene and triazole rings make dihedral angles of 85.45 (8) and 84.76 (8)° in the two molecules. The H-atom position of the perchloric acid molecule is split over two O atoms (real peaks on difference map), with site-occupation factors of 0.5. These H atoms form two classical hydrogen bonds [2.546 (5) and 2.620 (4) Å] with the same N atoms in both molecules. Five intermolecular non-classical C—HO interactions, with CO distances in the range 3.147 (5)–3.483 (5) Å, are found in the crystal structure.