[H-].[Na+].[F:3][C:4]1[CH:9]=[C:8]([F:10])[CH:7]=[CH:6][C:5]=1[OH:11].Cl[C:13]1[CH:18]=[C:17]([N+:19]([O-:21])=[O:20])[C:16]([CH3:22])=[CH:15][N+:14]=1[O-:23]>C1COCC1>[F:3][C:4]1[CH:9]=[C:8]([F:10])[CH:7]=[CH:6][C:5]=1[O:11][C:13]1[CH:18]=[C:17]([N+:19]([O-:21])=[O:20])[C:16]([CH3:22])=[CH:15][N+:14]=1[O-:23]To a suspension of sodium hydride (0.47 g, 60% in oil) in 50 mL of THF was added dropwise a solution of 1 mL of 2,4-difluorophenol in 10 mL of THF. The reaction mixture was stirred for one hour, and 2-chloro-5-methyl-4-nitropyridine-1-oxide (2.0 g) was added slowly. The resulting mixture was stirred at reflux for 8 hours and at room temperature overnight. The solvent was removed and the light yellow solid isolated by extraction with methylene chloride. Purification via chromatography (silica gel, ethyl acetate/hexane, 1:1) gave 1.65 g of 2-(2,4-difluorophenoxy)-5-methyl-4-nitropyridine-1-oxide (55% yield). Mass Spec. M+H=283.
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