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…