反应详情

Combine 1-bromo-4-fluoro-2-methylbenzene (30.0 g, 159 mmol) in concentrated sulfuric acid (100 mL), cool to about −5° C., and treat dropwise with nitric acid (11.00 mL, 174 mmol) over 20 minutes. Allow reaction mixture to warm to RT and stir for 30 min. Pour onto crushed ice with stirring and partition with tert-butyl methyl ether (MTBE) (200 mL). Separate the aqueous layer and extract with MTBE (2×50 mL). Combine organic layers, dry and concentrate under reduced pressure to provide 1-bromo-4-fluoro-2-methyl-5-nitrobenzene as an orange-colored viscous oil (39.0 g).

1. customAllow reaction mixture
2. additionPour
3. customonto crushed ice
4. stirringwith stirring
5. custompartition with tert-butyl methyl ether (MTBE) (200 mL)
6. customSeparate the aqueous layer
7. extractionextract with MTBE (2×50 mL)
8. customCombine organic layers, dry
9. concentrationconcentrate under reduced pressure