反应详情

温度

5 °C

A solution of 2-chloro-4-fluorobenzoic acid (24.4 g, 0.142 mol) in 150 ml of concentrated sulfuric acid at 0° C. was treated dropwise with 90% nitric acid (13.2 ml, 20 mol %, 0.284 mol) over a 10 min. period at 10° C., stirred for 2.5 hours at 0 to 10° C., poured onto one liter of ice. The white solid was filtered. The filtercake was air-dried and recrystallized from ethyl acetate/heptane to afford the title compound as off-white needles. Yield: 18.0 g (58.1%); identified by NMR spectral analysis.

1. filtrationThe white solid was filtered
2. customThe filtercake was air-dried
3. customrecrystallized from ethyl acetate/heptane