My watch list  


IUPAC name 4,6-Diamino-2-hydroxy-1,3,5-triazine
Other names Ammelin, s-triazin-2-ol, 2,4-diamino-1,3,5-triazin-6-one
CAS number 645-92-1
PubChem 10926
Molecular formula C3H5N5O
Molar mass 127.11 g/mol
Appearance White powder
Melting point

N/A (decomposes before melting)

Solubility in water trace
Solubility soluble in aqueous alkalies and mineral acids, but not acetic acid
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)

Infobox disclaimer and references

Ammeline (4,6-Diamino-2-hydroxy-1,3,5-triazine) is a triazine. It is the hydrolysis product of melamine.


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.


  • B. Bann and S.A. Miller, "Melamines and derivatives of melamine", Chemical Reviews, vol.58, p131-172 (1958).
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Ammeline". A list of authors is available in Wikipedia.
Your browser is not current. Microsoft Internet Explorer 6.0 does not support some functions on Chemie.DE