[F:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[CH:13]=[CH:12][N:11]=[CH:10][C:9]=2[C:14]([O:16][CH3:17])=[O:15])=[CH:4][CH:3]=1.[CH3:18][Br:19]>CC(C)=O>[Br-:19].[F:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[CH:13]=[CH:12][N+:11]([CH3:18])=[CH:10][C:9]=2[C:14]([O:16][CH3:17])=[O:15])=[CH:4][CH:3]=1The crude pyridine (5.95 g) was treated with methyl bromide (2.2 ml) in acetone (25 ml). After heating in a sealed vessel at 53° for 60 hours and cooling to 0°, the title pyridinium salt was collected by filtration, washed with acetone and dried (7.4 g, 88%), m.p. 165°-170° (decomp.).
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