Benzofurazans can be synthesised, either from the corresponding benzofuroxans or from appropriately substituted o-dinitrobenzenes, by treatment with sodium azide in ethylene glycol or in dimethyl sulphoxide, at 120–150 °C.
L. Di Nunno, S. Florio and P. E. Todesco, J. Chem. Soc., Perkin Trans. 1, 1973, 1954 DOI: 10.1039/P19730001954
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