Hydrochloric Acid → 4-(3-Mercaptopyridin-4-yl)benzonitrile

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A mixture of 4-(3-fluoropyridin-4-yl)benzonitrile (1.08 g, 5.4 mmol) and sodium sulfide (0.84 g, 10.8 mmol) in DMF (20 mL) was stirred at 130° C. for 0.5 hours. While the reaction was cooled in ice water bath, aqueous HCl (6N, 2.5 mL) was added drop wise with rigorous stirring. The resulting yellow paste was concentrated using rotary evaporation on a water bath (80° C.) to dryness. The resulting yellow solid was extracted with methanol (4×20 mL). The combined extracts were concentrated to dryness to give a yellow solid (1.1 g, 96%).

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