The extra ‘stabilization’ of the 2,2,4,6,7-pentamethyl-2,3-dihydrobenzofuran-5-oxyl radical compared with the 2,6-ditert-butyl-4-methoxyphenoxyl radical is attributed to entropy differences between the parent phenols.
R. A. Jackson and K. M. Hosseini, J. Chem. Soc., Chem. Commun., 1992, 967 DOI: 10.1039/C39920000967
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