Related Experiment Video
Updated: Oct 19, 2025

Modification and Functionalization of the Guanidine Group by Tailor-made Precursors
Published on: April 27, 2017
Dixanthylurea (N, N'-di-9H-Xanthen-9-ylurea)
C R Hubbard1, A D Mighell1, Alexander J Fatiadi1
1National Bureau of Standards, Washington, D.C. 20234.
Abstract:
C27H20N2O3, MW = 420, orthorhombic, Pbc21, a = 4.686(2), b = 16.784(8), c = 25.924(10)Å, V = 2039Å3, d = 1.37 g cm-3 (flotation), d = 1.369g cm-3, Z = 4. The structure has been determined by direct methods and refined to R = 0.045 based on 1419 independent reflections. No crystallographic symmetry element is present in the dixanthylurea molecule. In fact, the molecule is considerably distorted from any possible mirror symmetry. The molecules are hydrogen bonded in an infinite chain along the a-axis. The compound is of interest because of its role in the analytical determination of urea.
More Related Videos
Related Concept Videos
Oral Hypoglycemic Agents: Sulfonylureas
Antihypertensive Drugs: Thiazide-Class Diuretics
Oral Hypoglycemic Agents: Glinides
Diazonium Group Substitution: –OH and –H
Aryldiazonium Salts to Azo Dyes: Diazo Coupling
Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions

