Synthesis of 2,4,6-trinitrophenyl derivatives of heterocyclic compounds

The preparation of 2,4,6-trinitrophenyl (picryl) derivatives of triazine, pyrimidine, thiophene, furan, thiazole, 1,3,4-oxadiazole and 1,3,4-thiadiazole is described. The picryl derivatives are prepared by the Ullmann reaction and by cyclization reactions to form the heterocyclic ring.