They are reduced derivatives of 1,3,5-triazine, which have the formula (CHN)3, a family of aromatic heterocycles.
These The N,N',N"-triacyltriazines are trizines with acyl groups attached to the three nitrogen centers of the ring.
These triacyltriazines arise from the reaction of hexamethylene tetraamine with acid chlorides or the condensation of amides with formaldehyde.
They have the formula (RNC(O))3 and based on the isocyanuric (trione) tautomer of cyanuric acid.
Examples include Mo(CO)3[(CH2)3(NMe)3] formed from the TACH ligand and molybdenum hexacarbonyl.