Summary Differences in rates of benzyl C-CH3 homolysis for reactions 2-6 and 7-9 were used to derive differences in resonance stabilities (RSE) of the benzylic radical products of these reactions. Structure Resonance Theory gave values of RSE in good agreement with our experimental results; however, a significant difference is found between our experimental RSE for DPhMe. and that reported in the literature for the related 10-hydro-9- ...