t-Butyl o-tolyl nitroxides disproportionate slowly, giving o-aminobenzaldehydes and hydroxylamines. t-Butyl 2,6-xylyl nitroxides, however, are exceptionally stable. Attempted isolation of the diradical, o-phenylene di-t-butyl-dinitroxide, was unsuccessful because of its rapid decomposition to an aminoquinone imine N-oxide.
A. R. Forrester and S. P. Hepburn, J. Chem. Soc. C, 1970, 1277 DOI: 10.1039/J39700001277
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