反应详情

温度

0 °C

A solution of 7.5 g of sodium nitrite in 20 ml of water was added at -20° C. to 0° C. over 20 minutes to a suspension of 18.5 g of the product of Step C, 120 ml of a 48% hydrobromic acid solution and 80 ml of water and the mixture was stirred at 0° C. for 15 minutes and kept thereafter at 0° C. A solution of 22 g of cuprous bromide in 80 ml of 48% hydrobromic acid solution was heated with stirring to 50°-55° C. and the previous solution was then added thereto. The mixture was stirred at 55°-60° C. for one hour, was cooled and poured into water. The mixture was extracted with methylene chloride and the combined organic phases were washed with N sodium hydroxide solution, with water, dried and evaporated to dryness under reduced pressure at 50° C. The residue was rectified under reduced pressure to obtain 20.4 g of 3-isopropyl-4-bromo-nitrobenzene with a boiling point of 150°-152° C. at 8 mm Hg and having a refractive index of nD22 =1.5775.

1. customat 0° C
2. stirringwith stirring to 50°-55° C.
3. additionthe previous solution was then added
4. stirringThe mixture was stirred at 55°-60° C. for one hour
5. temperaturewas cooled
6. extractionThe mixture was extracted with methylene chloride
7. washthe combined organic phases were washed with N sodium hydroxide solution, with water
8. customdried
9. customevaporated to dryness under reduced pressure at 50° C