White crystalline solid
| 81.08 g/mol|
1,3,5-triazine, also called s-triazine, is an organic chemical compound with the formula (HCN)3. It is a six-membered heterocyclic aromatic ring, one of several isomeric triazines. S-triazine and its derivatives are useful in a variety of applications.
Symmetrical 1,3,5-triazines are prepared by trimerization of certain nitriles such as cyanogen chloride or cyanimide. Benzoguanamine (with one phenyl and 2 amino substituents) is synthesised from benzonitrile and dicyandiamide. In the Pinner triazine synthesis (named after Adolf Pinner ) the reactants are an alkyl or aryl amidine and phosgene Insertion of N-H moiety into hydrazide by a copper carbenoid, followed by treatment with ammonium chloride also gives the triazine core.
As a reagent in organic synthesis, s-triazine is used as the equivalent of hydrogen cyanide (HCN). Being a solid (vs a gas for HCN), triazine is sometimes easier to handle in the laboratory. One application is in the Gattermann reaction, used to attach the formyl group to aromatic substrates.
N- and C-substituted triazines are used industrially. The most common derivative of 1,3,5-triazine is 2,4,6-triamino-1,3,5-triazine, commonly known as melamine or cyanuramide. Another important derivative is 2,4,6-trihydroxy-1,3,5-triazine better known as cyanuric acid.
Trichloro-1,3,5-triazine (cyanuric chloride) is the starting point for the manufacture of many herbicides such as Simazine and atrazine. Chlorinated triazines are the basis of an important family of reactive dyes, which are covalently attached to cellulosic materials.
Triazines are also found in pharmaceutical products.