反应详情

温度

100 °C

A mixture comprising 4-nitro-3-methoxybenzoic acid (5.0 g, 25.4 mmol) and aqueous methylamine (40%, 15 mL) is a sealed tube was heated in an oil bath at 100° C. for 12 hours, allowed to cool to room temperature, and then poured into a stirring slurry of 1M aqueous hydrochloric acid and ice to give an orange precipitate. The precipitate was collected by filtration, rinsed with water and recrystallized from hot ethanol to provide 3-methylamino-4-nitrobenzoic acid as a bright red crystalline solid (3.6 g, 73% yield); 1H-NMR (300 MHz, DMSO-d6): 13.5 (s), 8.3 (q), 8.2 (d), 7.4 (s), 7.1 (d), 3.0 (d).

1. temperatureto cool to room temperature
2. customto give an orange precipitate
3. filtrationThe precipitate was collected by filtration
4. washrinsed with water
5. customrecrystallized from hot ethanol