“…3-Nitro-4-(1H-1,2,4-triazol-3-yl)-furazan (4). Compound 2 (0.5 g, 2.1 mmol) was added in small portions to as olution of Na 2 WO 4 2H 2 O( 0.82 g, 2.5 mmol) in am ixture of H 2 O 2 (37 %, 5.7 mL) with H 2 SO 4 (95 %, 2.9 mL) at r.t. After addition, the mixture was stirred at 50 8Cf or 3h.T he cooled mixture was poured into ice water (20 mL) 3136,2894,1601,1561,1523,1457,1400,1387,1358,1307,1236,1182,1105,1032,989,968,872,827 3103,3002,2972,1771,1761,1731,1594,1562,1453,1399,1389,1376,1331,1246,1213,1170,1114,1074,1015,983,828 Ethyl 2,2-dinitro-2-(3-(4-nitrofurazan-3-yl)-1H-1,2,4-triazol-5-yl)acetate (5). Compound 3 (0.27 g,1mmol) was added in small portions to am ixture of H 2 SO 4 (3.5 mL, 95 %) and HNO 3 (2.1 mL, 100 %) at 0 8C.…”