Reaktion #50912

Reaktionsgleichung

2-chloro-4-fluorobenzoic acid

nitric acid

→

title compound

2-Chloro-4-fluoro-5-nitrobenzoic Acid

Lösungsmittel

sulfuric acid

Reaktionsbedingungen

Aufarbeitung

1. 1
   FiltrationThe white solid was filtered
2. 2
   SonstigeThe filtercake was air-dried
3. 3
   Sonstigerecrystallized from ethyl acetate/heptane

Vorschrift

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.

Quelle