of reactive dyes. Cyanuric chloride assists in the amidation of carboxylic acids. The 1,2,4-triazines can react with electron-rich dienophiles in an inverse electron demand Diels-Alder reaction. This forms a bicyclic intermediate which normally then extrudes a molecule of nitrogen gas to form an aromatic ring again. In this way the 1,2,4-triazines can be reacted with alkynes to form pyridine rings. An alternative to using an alkyne is to use norbornadiene which can be thought of as a masked alkyne. In 2007, a method for synthesizing highly porous triazine-based polymers was discovered, and found to be useful (in conjunction with palladium) for the selective reduction of phenols. Ligands A series of 1,2,4-triazine derivatives known as bis-triazinyl bipyridines (BTPs) have been considered as possible extractants for use in the advanced nuclear reprocessing. BTPs are molecules containing a pyridine ring bonded to two 1,2,4-triazin-3-yl groups. Triazine-based ligands have been used to bind three dinuclear arene ruthenium (or osmium) compounds to form metallaprisms. References Heterocyclic Chemistry T.L. Gilchrist 1985 (1997, ) See also Hexahydro-1,3,5-triazine 6-membered rings with one nitrogen atom: pyridine 6-membered rings with two nitrogen atoms: diazines 6-membered rings with four nitrogen atoms: tetrazines 6-membered rings with five nitrogen atoms: pentazine 6-membered rings with six nitrogen atoms: hexazine Simple aromatic rings