The structure of 4-amino-3-(5-tetrazolate)-fiirazan(HAFT) was characterized by single crystal X-ray diffraction. The thermal decomposition process of HAFT was investigated by MS-FTIR-DSC-TG coupling technique. The res...The structure of 4-amino-3-(5-tetrazolate)-fiirazan(HAFT) was characterized by single crystal X-ray diffraction. The thermal decomposition process of HAFT was investigated by MS-FTIR-DSC-TG coupling technique. The result shows that the exothermic process occurs from 278.7-350℃, with a peak temperature of 324.7℃. The thennal decomposition gaseous products of HAFT are NO2, CO2, HCN, CO, NH3 and H2O. The detonation velocity and detonation pressure of HAFT were calculated by the nitrogen equivalent equation. The detonation velocity of HAFT is 7727.46 m/s, which is higher than that of TNT(7178 m/s). The detonation pressure of HAFT(25.27 GPa) is satisfactory. The sensitivity tests reveal HAFT possesses excellent insensitivities to impact and friction.展开更多
Five energetic compounds, 3,3-bis（tetrazol-5-yl）-4,4-azofurazan （DTZAF）, 3-nitro-4-（tetrazol-5-yl）furazan （NTZF）, hydrazinium 3-amino-4-（tetrazol-5-yl）furazan （HATZF）, triaminoguanidinium 3-amino-4-（tetra...Five energetic compounds, 3,3-bis（tetrazol-5-yl）-4,4-azofurazan （DTZAF）, 3-nitro-4-（tetrazol-5-yl）furazan （NTZF）, hydrazinium 3-amino-4-（tetrazol-5-yl）furazan （HATZF）, triaminoguanidinium 3-amino-4-（tetrazol- 5-yl）furazan （TAGATZF） and guanylureaium 3-amino-4-（tetrazol-5-yl）furazan （MATZF）, were prepared using 3-amino-4-（tetrazol-5-yl）furazan （ATZF） as starting material and their structures were characterized by FT-IR, IH NMR, 13C NMR and elemental analysis. The properties of NTZF were estimated： density is 1.67 g/cm3, enthalpy of formation ＋415.41 kJ/mol and detonation velocity 8257.83 m/s. The main thermal properties of four compounds, DTZAF, HATZF, TAGATZF and MATZF, were analyzed by TG and DSC techniques and the results showed that their melting points are 251.9, 159.7, 205.4 and 211.4 ℃, respectively, and their first decomposition temperatures are 256.7, 258.6, 231.7 and 268.6℃, respectively. The fact that their decomposition temperatures were over 230 ℃ showed that they exhibit better thermal stability.展开更多
2-(5-Amino-1,2,4-thiadiazol-3-yl)-2-(Z)-meth-oxyiminoacetic acid 2-benzothiazolyl thioester(III),an important intermediate of the fourth generation cephalos-porins,was efficiently synthesized by reacting 2-(5-amino-1,...2-(5-Amino-1,2,4-thiadiazol-3-yl)-2-(Z)-meth-oxyiminoacetic acid 2-benzothiazolyl thioester(III),an important intermediate of the fourth generation cephalos-porins,was efficiently synthesized by reacting 2-(5-amino-1,2,4-thiadiazol-3-yl)-2-(Z)-methoxyiminoacetic acid(I)with 2,29-dibenzothiazole disulfide(II)in the presence of triphenylphosphine.Effects of reaction time,temperature,solvents,catalysts and feeding molar ratio on the yield and quality of products were investigated,and an im-proved procedure suitable for industrial production was established.Using 1,2-dichloroethane as solvent,triphe-nylphosphine as reducer,and triethylamine as catalyst,n(I):n(II):n(triphenylphosphine)51.0:1.0:1.0,the product was obtained at room temperature in 98.1%yield.The purity of the product without further purification is 98.7%determined by HPLC method.This procedure could be a suitable alternative to the traditional processes because of its easy handling,high yield and low cost.展开更多
基金Supported by the National Natural Science Foundation of China(No.21241003)the Natural Science Foundation of Shaanxi Province,China(No.2018JM2061).
文摘The structure of 4-amino-3-(5-tetrazolate)-fiirazan(HAFT) was characterized by single crystal X-ray diffraction. The thermal decomposition process of HAFT was investigated by MS-FTIR-DSC-TG coupling technique. The result shows that the exothermic process occurs from 278.7-350℃, with a peak temperature of 324.7℃. The thennal decomposition gaseous products of HAFT are NO2, CO2, HCN, CO, NH3 and H2O. The detonation velocity and detonation pressure of HAFT were calculated by the nitrogen equivalent equation. The detonation velocity of HAFT is 7727.46 m/s, which is higher than that of TNT(7178 m/s). The detonation pressure of HAFT(25.27 GPa) is satisfactory. The sensitivity tests reveal HAFT possesses excellent insensitivities to impact and friction.
文摘Five energetic compounds, 3,3-bis（tetrazol-5-yl）-4,4-azofurazan （DTZAF）, 3-nitro-4-（tetrazol-5-yl）furazan （NTZF）, hydrazinium 3-amino-4-（tetrazol-5-yl）furazan （HATZF）, triaminoguanidinium 3-amino-4-（tetrazol- 5-yl）furazan （TAGATZF） and guanylureaium 3-amino-4-（tetrazol-5-yl）furazan （MATZF）, were prepared using 3-amino-4-（tetrazol-5-yl）furazan （ATZF） as starting material and their structures were characterized by FT-IR, IH NMR, 13C NMR and elemental analysis. The properties of NTZF were estimated： density is 1.67 g/cm3, enthalpy of formation ＋415.41 kJ/mol and detonation velocity 8257.83 m/s. The main thermal properties of four compounds, DTZAF, HATZF, TAGATZF and MATZF, were analyzed by TG and DSC techniques and the results showed that their melting points are 251.9, 159.7, 205.4 and 211.4 ℃, respectively, and their first decomposition temperatures are 256.7, 258.6, 231.7 and 268.6℃, respectively. The fact that their decomposition temperatures were over 230 ℃ showed that they exhibit better thermal stability.
文摘2-(5-Amino-1,2,4-thiadiazol-3-yl)-2-(Z)-meth-oxyiminoacetic acid 2-benzothiazolyl thioester(III),an important intermediate of the fourth generation cephalos-porins,was efficiently synthesized by reacting 2-(5-amino-1,2,4-thiadiazol-3-yl)-2-(Z)-methoxyiminoacetic acid(I)with 2,29-dibenzothiazole disulfide(II)in the presence of triphenylphosphine.Effects of reaction time,temperature,solvents,catalysts and feeding molar ratio on the yield and quality of products were investigated,and an im-proved procedure suitable for industrial production was established.Using 1,2-dichloroethane as solvent,triphe-nylphosphine as reducer,and triethylamine as catalyst,n(I):n(II):n(triphenylphosphine)51.0:1.0:1.0,the product was obtained at room temperature in 98.1%yield.The purity of the product without further purification is 98.7%determined by HPLC method.This procedure could be a suitable alternative to the traditional processes because of its easy handling,high yield and low cost.
