反应详情

2-Methyl-5-bromo-iodobenzene was synthesized according to the method described by Lulinski, P., Skulski, L., Bull. Chem. Soc. Jpn. 2000 73:951-956. To a mixture of acetic acid (100 ml) and acetic anhydride (50 ml), cooled in an ice bath, was added sodium periodate (15.4 g, 72 mmol) and iodine (12.2 g, 48 mmol). While stirring vigorously, concentrated sulfuric acid (21 ml) was added slowly followed by 4-bromotoluene (23.1 g, 135 mmol). After stirring for 2 hours, the ice bath was removed and the mixture was protected from light. After stirring for 16 hours, the mixture was poured into a mixture of 10% aqueous sodium sulfite solution (250 ml) and ice (250 g), and extracted with dichloromethane (3×100 ml). The combined extracts were washed with water (100 ml), dried over sodium sulfate, and concentrated under reduced pressure. The residual oil was purified by distillation (87-92° C., 1 mm) to provide 2-methyl-5-bromo-iodobenzene (28.2 g, 70% yield) as colorless oil. 1H NMR (DMSO-d6) δ 7.99 (s, 1H), 7.50 (d, J=8.1 Hz, 1H), 7.28 (d, J=8.1 Hz, 1H), 2.33 (s, 3H).

1. custom2-Methyl-5-bromo-iodobenzene was synthesized
2. temperaturecooled in an ice bath
3. stirringAfter stirring for 2 hours
4. customthe ice bath was removed
5. stirringAfter stirring for 16 hours
6. additionthe mixture was poured into a mixture of 10% aqueous sodium sulfite solution (250 ml) and ice (250 g)
7. extractionextracted with dichloromethane (3×100 ml)
8. washThe combined extracts were washed with water (100 ml)
9. dry with materialdried over sodium sulfate
10. concentrationconcentrated under reduced pressure
11. distillationThe residual oil was purified by distillation (87-92° C., 1 mm)