反应详情

温度

90 °C

A mixture of methyl 3-nitrobenzoate (122 g, 674 mmol), silver sulphate (100 g, 320.7 mmol) and concentrated sulfuric acid (750 mL) was stirred mechanically and heated at 90° C. To this mixture was added bromine (37 mL), dropwise, over 2 h. The reaction was stirred another hour, cooled and filtered. The filtrate was mixed with 2 L water and 1 Kg crushed ice. The solid was filtered and dried to afford a mixture of the desired methyl ester and free acid hydrolysis product. The mixture was taken up into methanol (1 L), treated with 10 drops concentrated sulfuric acid and refluxed for 12 h. The reaction mixture was allowed to cool and the crystals that were deposited were collected and dried in a desiccator to afford 126 g (72% yield) of methyl 3-bromo-5-nitrobenzoate (EX-119A): 1H NMR (300 MHz, CDCl3) δ 8.65 (s, 1 H), 8.44 (s, 1 H), 8.37 (s, 1 H), 3.94 (s, 3H).

1. stirringThe reaction was stirred another hour
2. temperaturecooled
3. filtrationfiltered
4. additionThe filtrate was mixed with 2 L water and 1 Kg
5. customcrushed ice
6. filtrationThe solid was filtered
7. customdried
8. customto afford
9. temperaturerefluxed for 12 h
10. temperatureto cool
11. customthe crystals that were deposited were collected
12. customdried in a desiccator