Abstract
Several examples of the hitherto unreported imidazo[4,5-f]benzofuroxan ring system have been prepared by both thermal (135°) and photolytic decomposition of the appropriate azidonitrobenzimidazoles. Pyrolysis of the nitroazides at higher temperature (180–190°) gave the corresponding imidazo[4,5-f]furanzans. The 1H n.m.r. and u.v. spectra are recorded.Some new 6-amino-5-nitro- and 5-amino-6-nitro-benzimidazoles are reported.
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