ESR spectroscopy and simulation suggest that meso-tetrakis(3,5-di-tert-butyl-4-hydroxyphenyl)porphyrin 1 undergoes aerial oxidation in acidified solutions to give a long-lived π-cation radical with a quasi-2A2u ground state.
L. R. Milgrom, W. D. Flitter and E. L. Short, J. Chem. Soc., Chem. Commun., 1991, 788 DOI: 10.1039/C39910000788
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