Intermolecular C–O addition of carboxylic acids to arynes: synthesis of O-hydroxyaryl ketones, xanthones, 4-chromanones, and flavones

~85%

~18%

~72%

~76%

~49%

~63%

~78%

~64%

~55%

~%

~%

~76%

~53%

~79%

~37%

~30%

~21%