Potassium Carbonate → HCID 69487859, compound

Participants

Reaction Steps

3-(4-Trifluoromethyl-phenyl)-furan-2,5-dione. A mixture of 4-(trifluoromethyl)phenylacetonitrile (9.26 g, 50 mmol), glyoxylic acid monohydrate (6.9 g, 75 mmol), and potassium carbonate (17 g, 125 mmol) in methanol (100 mL) was stirred at room temperature for 3-5 h. The resulting thick solid precipitate was filtered and washed with dichloromethane. This solid was suspended in 250 mL of water, stirred overnight, and filtered and air-dried to provide 3-cyano-3-(4-trifluoromethyl-phenyl)-acrylic acid potassium salt. This was dissolved in 88% formic acid (ca. 200 mL) containing concentrated sulfuric acid (15 mL). This mixture was heated at reflux for 2-3 h and cooled and poured into ice water. The resulting precipitate was collected by filtration, washed with water, and air dried to provide the title compound. 1H NMR (DMSO-d6) δ 7.94 (s, 1H), 7.97 (d, J=8.2 Hz, 2H), 8.24 (d, J=8.2 Hz, 2H).

Provenance & Evidence