中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | N-(2-methyl-4,6-dinitro-phenyl)-hydroxylamine | —— | C7H7N3O5 | 213.15 |
2,3,5-三硝基甲苯 | 1-methyl-2,3,5-trinitrobenzene | 609-74-5 | C7H5N3O6 | 227.133 |
—— | acetic acid-(2-methyl-4,6-dinitro-anilide) | 56207-35-3 | C9H9N3O5 | 239.188 |
N-(2-甲基-6-硝基苯基)-乙酰胺 | N-(2-methyl-6-nitrophenyl)acetamide | 59907-22-1 | C9H10N2O3 | 194.19 |
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 2,3-Diamino-5-nitro-toluol | 70499-98-8 | C7H9N3O2 | 167.167 |
2,3,5-三硝基甲苯 | 1-methyl-2,3,5-trinitrobenzene | 609-74-5 | C7H5N3O6 | 227.133 |
—— | 6-methyl-2,4-dinitroazidobenzene | 104503-86-8 | C7H5N5O4 | 223.148 |
2-氨基-3,5-二硝基苯甲酸 | 2-amino-3,5-dinitro-benzoic acid | 609-97-2 | C7H5N3O6 | 227.133 |
3,5-二硝基甲苯 | 3,5-dinitrotoluene | 618-85-9 | C7H6N2O4 | 182.136 |
—— | (2-methyl-4,6-dinitro-phenyl)-urea | 75370-61-5 | C8H8N4O5 | 240.175 |
—— | acetic acid-(2-methyl-4,6-dinitro-anilide) | 56207-35-3 | C9H9N3O5 | 239.188 |
3-甲基-5-硝基苯胺 | 3-methyl-5-nitro-aniline | 618-61-1 | C7H8N2O2 | 152.153 |
2,3,5-三硝基苯甲酸 | 2,3,5-trinitro-benzoic acid | 102312-37-8 | C7H3N3O8 | 257.116 |
3,5-二硝基苯甲酸 | 3,5-Dinitrobenzoic acid | 99-34-3 | C7H4N2O6 | 212.119 |
Published reports describe the oxidative cyclization of suitable ortho-substituted arenamines to form such products as 2,1-benzisoxazoles, benzofurazan 1-oxides and benzotriazoles, by using bis(acetato-O)phenyliodine at room temperature. However, the reactions are often inconveniently slow. We now report attempts to achieve short reaction times with more powerful iodine(III) oxidants. These often failed to give cyclic products, but the results enable us to argue that the reaction competing with cyclization involves the arenaminyl, cation ArN+H. When such cations are predicted to be relatively unstable, the parent arenamine can be rapidly cyclized in high yield by oxidation with bis(acetato-O)phenyliodine in boiling benzene.
Rates and products of pyrolysis have been obtained for ten 2- nitroazidobenzenes with 4- or 5-substituents. Rate data at 100° are correlated with Hammett constants of the 4- or 5-substituents, with respect to both the azido (A) and nitro (N) reaction centres, and yield the equation log k = -3.23 + 1.20σ-/A -0.716σN. Dissection of this equation into σI and σR components was usefully attempted. The results are consistent with an electrocyclic process in which delocalization of negative charge from the innermost azido nitrogen is important at the transition state, whereas substituent effects on bridging by nitro are less important. An interpretation is made of pyrolysis rates of 4-azido-3-nitropyridine, several 2,6- dinitroazidobenzenes, and methyl 2-azidobenzoate. The rate for 4-azido- 3-nitropyridine yields a σ- value of 1.2 for the 4-aza 'substituent'.