The existence of methyl radicals in the photo-Kolbe reaction was
confirmed by means of in situ
measurements with flow electron spin resonance for deuterated acetic
acid. From the dependence of the
flow rate, two reaction paths were deduced for methyl radical
formation. These were assigned to those
caused by trapped holes and •OH radicals. It is
suggested that the former path is dominant when platinum
has not been loaded onto TiO2 powder.
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