Triuret

Triuret is an organic compound with the formula (H2NC(O)NH)2CO. It is a product from the pyrolysis of urea. Triuret is a colorless, crystalline, hygroscopic solid, slightly soluble in cold water or ether, and more soluble in hot water. It is a planar molecule. The central carbonyl is hydrogen-bonded to both terminal amino groups.[1]

Triuret
Names
Other names
Carbonyldiurea
1,3-Dicarbamylurea
Dicarbamylurea
Diimidotricarbonic diamide
2,4-diimidotricarbonic diamide
Tricarbonodiimidic diamide
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.008.317
EC Number
  • 209-147-7
MeSH C017781
UNII
Properties
C3H6N4O3
Molar mass 146.106 g·mol−1
Density 1.547 g/cm3
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Synthesis

The compound is typically prepared by heating thin layers of urea, the thin layers facilitating escape of ammonia:

3 (H2N)2CO → [H2NC(O)NH]2CO + 2 NH3

It can also prepared by treatment of urea with phosgene:[2]

2 (H2N)2CO + COCl2 → [H2NC(O)NH]2CO + 2 HCl

A similar synthesis employs urea and dimethyl carbonate with potassium methoxide as a catalyst:[3]

2 (H2N)2CO + CO(OCH3)2 → [H2NC(O)NH]2CO + 2 MeOH

The original synthesis entailed oxidation of uric acid with hydrogen peroxide.[4]

Triuret is a complicating by-product in the industrial synthesis of melamine from urea.

References
  1. D. Carlström and H. Ringertz "The molecular and crystal structure of triuret" Acta Crystallogr. (1965. vol. 18, 307-313. doi:10.1107/S0365110X65000737
  2. C. Nitschke, G. Scherr (2012). "Urea Derivatives". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.o27_o04.CS1 maint: uses authors parameter (link)
  3. Chen, Jianchao; Zhao, Peihua; Liu, Yaqing; Liu, Hua; Zhu, Futian (2012). "Clean and facile synthesis of triuret from urea and dimethyl carbonate (DMC) under mild conditions". Korean Journal of Chemical Engineering. 29 (3): 288–290. doi:10.1007/s11814-011-0172-8.
  4. Alfred Schittenhelm, Karl Wiener "Carbonyldiharnstoff als Oxydationsprodukt der Harnsäure" Zeitschrift für Physiologische Chemie 1909, volume 62, 100 ff..
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