has specified product flavonols ring expansion oxacycle synthesis Auwers synthesis RXNO RXNO:0000474 Ring expansion of a 2-bromo-2-(alpha-bromobenzyl)-1-benzofuran to a flavonol in alcoholic alkali. https://www.rsc.org/Merck-Index/reaction/r11/ https://www.wikidata.org/wiki/Q3115850