We have shown that radical cations generated by photoinduced electron transfer (ET) in 1,2-diarylethanes, aryl pinacols, and their derivatives undergo fragmentation reactions. In the presence of oxygen oxidative products are obtained. Time-resolved laser flash photolysis and other ancillary techniques have permitted us to define the mechanisms of certain oxidative processes observed.
Ultraviolet irradiation of 3-phenyl-2-cyclohexenone has been found to give a single photo dimer, whose structure has been established as the cis–anti–cis head-to-head cyclobutane derivative X.
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