Aerobic organisms, reactions involving radicals

Radical substitution reactions involving allylic tin derivatives could be accompanied by a photoinduced 1,3-rearrangement54,55. A photostationary mixture of cinnamyl(tri-phenyl)stannane with its regioisomer l-phenylprop-2-enyl(triphenyl)stannane has been shown to form in the photolysis of ( )-cinnamyl(triphenyl)stannane in benzene under aerobic conditions, or in the presence of halogenated organic compounds or radicaltrapping reagents (equation 21). 

Reactions involving 02 radicals have also been tied to the deleterious effects of oxygen upon aerobic organisms (i, 3), probably as a result of similar Fenton-type chemical reactions. 

Free radical reactions are necessary for the normal operation of a number of biological processes. The catalytic action of many enzymes such as xanthine oxidase and electron transport processes involves one-electron transfers that yield free radical intermediates. Because of the ubiquity of molecular oxygen in aerobic organisms and... 

A number of reactions involving alkane photooxidation by polyoxometalates have been run under aerobic conditions. Those by PWi2O40 and Wio032 are summarized at the end of Table I (see section 5). Unfortunately these reactions, collectively, are rather uninformative with respect to mechanism. Radical chain autoxidation processes are undoubtedly present and few if any of the reported papers have addressed the requisite experiments to differentiate autoxidation from other oxidation pathways. A similar general limitation exists in the literature on photocatalytic aerobic oxidation of organic compounds by semiconductor materials [66]. 

---