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Revision as of 10:03, 14 February 2011
Names | |
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IUPAC name
4,6-Diamino-2-hydroxy-1,3,5-triazine
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Other names
Ammelin, s-triazin-2-ol, 2,4-diamino-1,3,5-triazin-6-one
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Identifiers | |
3D model (JSmol)
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ChemSpider | |
ECHA InfoCard | 100.010.415 |
KEGG | |
PubChem CID
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CompTox Dashboard (EPA)
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Properties | |
C3H5N5O | |
Molar mass | 127.11 g/mol |
Appearance | White powder |
Melting point | N/A |
trace | |
Solubility | soluble in aqueous alkalies and mineral acids, but not acetic acid |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Ammeline (4,6-Diamino-2-hydroxy-1,3,5-triazine) is a triazine. It is the hydrolysis product of melamine.
Synthesis
Ammeline can be synthesized by the pyrolysis of urea, or the condensation reaction amond 2 moles of dicyandiamide with 1 mole of biuret.
- 2C2H4N4 + C2H5N3O2 → 2C3H5N5O + NH3
Chemical property
Ammeline is weakly acidic with pKa ~9. It can form nitrate, sulfate, chromate and oxalate salts. Ammeline reacts with boiling dilute hydrochloric acid to form melem and ammonia.
Ammeline is the first step in melamine hydrolysis. Further hydrolysis (e.g. boiling ammeline with dilute alkali) yields ammelide.
References
- B. Bann and S.A. Miller, "Melamines and derivatives of melamine", Chemical Reviews, vol.58, p131-172 (1958).