反应详情

2,3,6-trimethyl phenol 1 (19.1 g) was dissolved in acetic acid (190 mL). This solution was added to an acetic acid solution of HNO3 (150 mL, 1M) at room temperature in 4.5 hours. After another 0.5 hour, the mixture was evaporated, and the residue was taken up by EtOAc (350 mL). This solution was washed with water (150 mL×2), and brine (150 mL), dried and evaporated. Elution on a silica column (Hexane: EtOAc, 5:1-5:2), gave 2,3,6-trimethyl-4-nitrophenol (7.56 g), as a yellow solid. 1H-NMR, (300 MHz, CDCl3) δ=7.61 6, (br s, 1H), 2.432 (s, 3H), 2.275 (s, 3H), 2.242 (s, 3H) ppm.

1. customthe mixture was evaporated
2. washThis solution was washed with water (150 mL×2), and brine (150 mL)
3. customdried
4. customevaporated
5. washElution on a silica column (Hexane: EtOAc, 5:1-5:2)