Synthesis and thermal performance of 4H, 8H-Difurazano[3, 4-b: 3′, 4′-e]pyrazine

4H, 8H-Difurazano[3, 4-b: 3′, 4′-e]pyrazine (DFP) was synthesized via condensation, chlorination, oximation and cyclization using 3, 4-diaminofurazan as starting material. The structures of intermediates and target compound were characterized by IR, NMR, elemental analysis and MS. A novel method of furazan cyclization was designed. The optimum condition was determined as: the molar ratio of urea and 5, 6-dioximinofurazano[3, 4-b] pyrazine (DOFP) was 3:1, the reaction time was 24h and the reaction temperature was at 120°C. The yield of target compound was 81.3% with the purity of 98.0% (HPLC). The thermal performance of target compound was studied using DSC and TG-DTG. The result shows that furazanopyrazine compounds have preferable thermal stability.