Abstract
The 100-kHz and time-dependent TR ESR results on the photooxidation of 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)-2,4,6-trimethylbenzene (IOH) reveal that two radicals are formed. The experimental observations are consistent with the initial formation of the primary phenoxy radical IO which is broadened by fast H-exchange from one phenolic moiety to another. The second radical XO exhibits hindered rotation of its methylene group and is suggested to be produced from secondary photolysis of an intermediate photoproduct, likely I=O, formed via a self-disproportionation reaction of the IO radicals
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