反应详情

温度

0 °C

In a 250 ml round bottom flask equipped with a magnetic stirrer was added 8.91 g (72.4 mmol) p-anisidine (Aldrich), 30 ml conc. HCl(aq) (J. T. Baker), 150 ml absolute ethanol and 150 ml deionized water. Sodium nitrite (5.36 g, 77.6 mmol) in 30 ml water was added dropwise over 30 minutes while keeping the reaction mixture at −10° C. The reaction mixture was stirred for an additional 1 hour. 300 mg sulfamic acid was added and then stirred for an additional 20 minutes. The solids were filtered out and the cold diazonium solution was set aside. (2-hydroxy-5-methyl-1,3-phenylene)dimethanol was dissolved in 100 ml deionized water. Approximately one-fourth by volume of a solution comprised of 14.7 g (367 mmol) NaOH in water was added to the (2-hydroxy-5-methyl-1,3-phenylene)dimethanol solution and the reaction mixture was cooled to 0° C. The diazonium mixture and remaining NaOH solution were added simultaneously to the (2-hydroxy-5-methyl-1,3-phenylene)dimethanol mixture over 30-60 minutes and then stirred for an additional 1 hour at 0° C. and 4 hours at ambient temperature. The mixture was poured into 3 L deionized water and acidified to pH 4 with 1 N HCl. The solid was filtered and washed with several liters water and vacuum dried at 50° C. to give 15.9 g (81%) of an orange solid. 1H NMR (CDCl3) delta: 13.22 (s, 1H, Ar—OH), 7.85 (m, 2H, Ar—H), 7.66 (s, 1H, Ar—H), 7.17 (s, 1H, Ar—H), 7.03 (m, 2H, Ar—H), 4.77 (s, 2H, Ar—CH2), 3.89 (s, 3H, CH3O—Ar), 2.37 (s, 3H, Ar—CH3).

1. customIn a 250 ml round bottom flask equipped with a magnetic stirrer
2. customat −10° C
3. stirringstirred for an additional 20 minutes
4. filtrationThe solids were filtered out
5. dissolution(2-hydroxy-5-methyl-1,3-phenylene)dimethanol was dissolved in 100 ml
6. stirringstirred for an additional 1 hour at 0° C. and 4 hours at ambient temperature
7. additionThe mixture was poured into 3 L
8. filtrationThe solid was filtered
9. washwashed with several liters water and vacuum
10. customdried at 50° C.