The photo-Fries rearrangement occurs when the substrate molecules are adsorbed on a silica gel–pentane slurry or on dry silica gel; the latter conditions are most effective when there is no free ortho position and substantial movement in the radical pair intermediate is required.
D. Avnir, P. de Mayo and I. Ono, J. Chem. Soc., Chem. Commun., 1978, 1109 DOI: 10.1039/C39780001109
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