Allophanic acid
(Redirected from C2H4N2O3)
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| Preferred IUPAC name
Carbamoylcarbamic acid | |
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3D model (JSmol)
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| 1756623 | |
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PubChem CID
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CompTox Dashboard (EPA)
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| Properties | |
| C2H4N2O3 | |
| Molar mass | 104.065 g·mol−1 |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Allophanic acid is the organic compound with the formula H2NC(O)NHCO2H. It is a carbamic acid, the carboxylated derivative of urea. Biuret can be viewed as the amide of allophanic acid.
Treating urea with sodium bicarbonate is claimed to give allophanic acid:[1]
- H2NC(O)NH2 + NaHCO3 → H2NC(O)NHCO2H + NaOH
Although allophanic acid per se may not have been purified, its conjugate base, H2NC(O)NHCO2−, allophanate is well known. Salts of this anion have been characterized by X-ray crystallography.[2][3] The allophanate anion is the substrate for the enzyme allophanate hydrolase.
Allophanate esters arise from the condensation of carbamates.
References
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