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New quaternary salts of pentafluorosulfanyl-substituted (SF 5 ) N-methylimidazole (1), 4-amino-1,2,4-triazole (3) or pyridine (5) were prepared and characterized. Most of the salts exhibit good thermal stabilities and low melting points placing them in the ionic liquid class. Their densities range between 1.4 and 1.8 g/cm 3 . The standard enthalpies of for-

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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.