Interconversion of benzofurazandione monoximes |
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Authors: | AS Angeloni D Dal Monte E Sandri G Scapini |
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Institution: | Facolta di Chimica Industriale dell ''Universita Viale Risorgimento, 4-40136 Bologna, Italy |
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Abstract: | The preparation of 5-hydroxy-4-nitroso- and 7-hydroxy-4-nitrosobenzofurazan as well as of their 6-chloro and methyl derivatives is described and the oxime structure of these compounds is established. NMR spectra of benzofurazan-4,5-dione-4-monoxime and benzofurazan-4,7-dione-4-monoxime show evidence for an interconversion, in solution, of two monoximes, the 4,5- and 4,7-derivative prevailing in organic solvents and aqueous alkaline media, respectively. Chloro and methyl derivatives of benzofurazan-4,5- and 4,7-dione-4-monoximes show a similar interconversion in organic solvents. |
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