P([O-])([O-])([O-])=O.[K+].[K+].[K+].[F:9][C:10]1[CH:11]=[C:12]([CH:15]=[C:16]([F:20])[C:17]=1[CH:18]=[O:19])[C:13]#[N:14].Cl([O-])=[O:22].[Na+].C(OCC)(=O)C>O.CS(C)=O>[C:13]([C:12]1[CH:11]=[C:10]([F:9])[C:17]([C:18]([OH:22])=[O:19])=[C:16]([F:20])[CH:15]=1)#[N:14]Potassium phosphate, monobasic (1.0 g, 7.5 mmol) in water (10 mL) was added to a solution of 3,5-difluoro-4-formylbenzonitrile (0.50 g, 0.0030 mol, Aldrich) in DMSO (10 mL). Sodium chlorite (0.7 g, 0.006 mol) in water (10 mL) was added and the reaction was stirred for 1 hour. Ethyl acetate and water were added. Layers were separated, and the aqueous was saturated with solid NaCl and extracted with further ethyl acetate. The combined organic extracts were washed with sat. NaCl, dried and rotovapped to give a white solid. 1H NMR (300 MHz, d6-dmso): δ 7.98-7.91 (m, 2H).
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