Studies On The Synthesis And Technology Of ANFF-1 And BNFF-1

Furazan ring is an effective structural unit to design high energy density compounds. Furazan derivatives have energy and stability for its C=N bond and aromaticity. So furazan ring is an important skeleton to design a series of furazan-based energetic compounds with high density of crystal, high formation enthalpy, good stability and excellent properties. It has a good application prospect in the aspects of propellants and melt-cast explosive. The main work of this paper focus on the synthesis and technological of trifurazans compounds including the following aspects:(1) 3-Amino-4-acylaminoximinofurazan(AAOF) was synthesized using methylene cyanide as starting material through nitrosation, rearrangement,oximation, dehydration cyclization. 3-Amino-4-acylchloroximinofurazan(ACOF)was prepared from AAOF through diazotization reaction;3,4-bis(3'-aminofurazan-4'-)furoxan(BAFF) was synthesized from ACOF by the intermolecular dehydration condensation in the ether. The key intermediate3,4-bis(3'-aminofurazan-4'-)furazan(BAFF-1) was synthesized from BAFF reduced by Sn Cl2·2H2O, the total yield was 26%. The synthetic technological conditions were investigated and the optimum technological parameters were obtained and the synthetic mechanism of BAFF-1 was explored. The structures of intermediates were characterized by IR, MS, NMR spectra.(2) 3-(4'-Aminofurazan-3'-)-4-(4'-nitrofurazan-3'-)furazan(ANFF-1) was prepare from the oxidation of BAFF-1 and 35% hydrogen peroxide in the acidic condition. The optimum technological parameters were obtained though technical studies, and the synthetic mechanism of BAFF-1 was discussed. The structure of ANFF-1 was characterized by IR, MS, NMR spectra and elemental analysis. The detonation velocity and detonation pressure of ANFF-1 was calculated, and the thermal property was studied.(3) 3,4-Bis(3'-nitrofurazan-4'-)furazan(BNFF-1) was prepare from BAFF-1and 50% hydrogen peroxide in the presence of sodium tungstate as catalyst. The optimum technological parameters were obtained though technical studies. The structure of target compound was characterized by IR, MS, NMR spectra andelemental analysis, and the thermal property was studied.