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Updated: May 7, 2026

Continuous Flow Chemistry: Reaction of Diphenyldiazomethane with p-Nitrobenzoic Acid
Published on: November 15, 2017
2,2'-{[2-(2-Chloro-phen-yl)-4-methyl-imidazolidine-1,3-di-yl]bis-(methyl-ene)}diphenol
Augusto Rivera1, Lorena Cárdenas, Jaime Ríos-Motta
1Universidad Nacional de Colombia, Sede Bogotá, Facultad de Ciencias, Departamento de Química, Cra 30 No.45-03, Bogotá, Código Postal 111321, Colombia.
Abstract:
In the title compound, C24H25ClN2O2, the 2-hy-droxy-benzyl substituents and the 2-chloro-phenyl group occupy the sterically preferred equatorial positions, whereas the methyl group occupies the axial position. The imidazolidine ring adopts an envelope conformation with one of the N atoms adjacent to the methylene group as the flap. The chloro-phenyl substit-uent approaches a nearly perpendicular orientation relative to the mean plane of the imidazolidine ring, making a dihedral angle of 73.44 (12)° and the Cl atom is almost coplanar with the C atom bearing the chloro-phenyl substituent [Cl-C-C-C torsion angle = 1.1 (3)°]. The hy-droxy-benzyl groups make dihedral angles of 71.23 (15) and 69.13 (19)° with the mean plane of the heterocyclic ring. The dihedral angle between the two hy-droxy-benzyl groups is 69.61 (12)°. The mol-ecular structure features two intra-molecular O-H⋯N hydrogen bonds with graph-set motif S(6) between the phenolic hydroxyl groups and N atoms.
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