Solutions of 2-alkoxycarbonylphenylhydroxylamines in carbon tetrachloride contain long-lived 2-alkoxycarbonylphenyl nitroxide radicals which show long-range hyperfine splitting constants due to coupling with protons in the alkyl residue of the ester group, in their e.s.r. spectra. Selective line broadening in the 1H n.m.r. spectra of the hydroxylamines due to exchange with the radical is observed.
B. G. Cox, R. J. Gillespie, R. S. Hay, A. E. A. Porter and J. S. Roberts, J. Chem. Soc., Perkin Trans. 2, 1977, 904 DOI: 10.1039/P29770000904
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