Stable aminoxyls and an iminoxyl were observed by spin trapping and EPR techniques during the nitration of coumarins containing a hydroxy group by nitric oxide. The trapped free radicals are deduced to be the resonance stabilized phenoxy-like radicals. The mechanisms for the nitrations are suggested.
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Lei, L.D., Wang, F., Yang, D.S. et al. Resonance-stabilized phenoxy-like radicals formed by NO-mediated mono-nitration of coumarins containing a hydroxy group. Res Chem Intermediat 30, 269–278 (2004). https://doi.org/10.1163/156856704323034003
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DOI: https://doi.org/10.1163/156856704323034003