has_part Lewis acid catalysis rearrangement step Fries rearrangement Can be promoted by heat or UV. The UV version (photo-Fries) involves a radical mechanism. RXNO RXNO:0000444 Rearrangement of the acyl group in a phenolate ester to the ortho- and/or para-position. It is catalysed by a Lewis acid. https://www.rsc.org/Merck-Index/reaction/r160/ https://www.wikidata.org/wiki/Q574893 photo-Fries rearrangement ortho-Fries rearrangement para-Fries rearrangement