反应详情

6-Fluoro-4-oxo-4H-1-benzopyran-2-carboxylic acid (III) was reacted with 10% palladium on carbon in acetic acid as solvent under hydrogen atmosphere to give 6-fluoro-3,4-dihydro-2H-1-benzopyran-2-carboxylic acid (IV) as shown in Reaction-2 given below by a known process (U.S. Pat. No. 4,654,362).