Rotational barriers of some para-substituted benzoyl radicals have been measured by e.s.r. techniques: the linear correlation between the e.s.r. ΔG‡ values and the corresponding n.m.r. ΔG‡ values allows us to estimate the free energy of activation of the unsubstituted benzoyl radical [ΔG‡ 2.8 ± 0.15 kcal mol–1(11.8 ± 0.6 kJ mol–1)].
L. Grossi and G. Placucci, J. Chem. Soc., Chem. Commun., 1985, 943 DOI: 10.1039/C39850000943
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