Yield:-

Reaction Conditions:

in ice-water;acetic acid;

Steps:

9 1-(4-Fluoro-phenyl)-3-oxo-1,3-dihydro-isobenzofuran-5-carboxylic Acid

Example 9 1-(4-Fluoro-phenyl)-3-oxo-1,3-dihydro-isobenzofuran-5-carboxylic Acid Zink (38 g, 0.58 mol) was suspended in acetic acid (400 mL). The mixture was heated to 60° C. 2,4-dicarboxy-4'-fluoro-benzophenone (21 g, 0.075 mol) was added in portions of 5 grams. After addition, the reaction mixture was heated at reflux temperature for two hours. The suspension was filtered while it was still hot. The filtrate was added to ice-water (1 kg) and the title compound was isolated by filtration. Yield 17.8 g (90%). 1H NMR (d⁶-DMSO): δ 6.84 (s, 1H), 7.17 (t, 2H), 7.43 (dd, 2H), 7.59 (d, 1H), 8.31 (d, 1H), 8.35 (s, 1H).

References:

US2003/134895,2003,A1