反应详情

温度

-5 °C

Alternatively, 2-amino-5-(phenylthio) pyridine (30 g., 0.15 moles) is added portionwise to 30 ml. of concentrated hydrochloric acid at 0°. The resultant suspension is cooled to -15° C and 20.7 g. of sodium nitrite in 40 ml. of water is added dropwise while keeping the temperature at -15° to -10° C. After stirring for an additional hour at -5° C, an aqueous 30% sodium hydroxide solution is slowly added to pH7 while not allowing the temperature to exceed 0° C. The resultant mixture is extracted with methylene chloride and the combined extracts are washed with water, dried and evaporated in vacuo to yield 2-chloro-5-(phenylthio) pyridine.

1. customat 0°
2. customat -15° to -10° C
3. customto exceed 0° C
4. extractionThe resultant mixture is extracted with methylene chloride
5. washthe combined extracts are washed with water
6. customdried
7. customevaporated in vacuo