Preparation of 4-benzopyrone-2-carboxylic acid_Kain Industrial Additive

Overview[1] 4-Benzopyranone-2-carboxylic acid is a carboxylic acid organic compound and can be used as a pharmaceutical synthesis intermediate. Preparation[1] 4-Benzopyranone-2-carboxylic acid is prepared as follows: 1) 4-oxo-4H-benzopyran-2-carboxylic acid: within 20 minutes, mix diethyl oxalate (110mL, 810mmol) and 2′-hydroxyacetophenone (44mL, 365mmol) The mixture was added to a solution of sodium ethoxide (76 g, 1.11 mol) in…