反应详情

温度

108 °C

Resorcinol (1,3-dihydroxybenzene) (62.000 g, 563.1 mmol, 1.0 equiv.) and 4-Hydroxyphenylacetic acid (94.237 g, 619.4 mmol, 1.1 equiv.) were added to a 3 neck 2 L round bottomed flask fitted with a paddle, a pressure equalizing addition funnel and a thermometer and a heating mantle. Toluene (350 mL) was added to the flask to give a suspension. The reaction purged with nitrogen and the addition funnel filled with Boron trifluoride etherate (198.201 ml, 1578.0 mmol, 2.8 equiv.) via canula. The reaction was stirred at 150 rpm and boron trifluoride etherate was added in portions of 3-4 mL and the reaction heated. During addition the internal temperature rose to 100° C. The reaction went through various changes in color from yellow to dark red. After complete addition of boron trifluoride etherate the addition funnel was removed and replaced with a condenser. The reaction was stirred for 1.5 h at an internal temperature of 108° C. A sample was taken and HPLC analysis indicated the reaction was complete. The reaction was cooled and stirring stopped to give a biphasic solution. A 12% aqueous solution of sodium acetate (41 g, 336 mL) was slowly added to the reaction with stirring. The reaction was stirred for 16 hours. A precipitate formed overnight and was collected in a sintered glass funnel. The solid was dried on a vacuum oven for 16 h to give the product as a white powder (119.67 g, 87.0%).

1. customfitted with a paddle
2. additionaddition funnel
3. customto give a suspension
4. customThe reaction purged with nitrogen
5. additionwas added in portions of 3-4 mL
6. temperaturethe reaction heated
7. additionDuring addition the internal temperature
8. customrose to 100° C
9. customwas removed
10. customreplaced with a condenser
11. temperatureThe reaction was cooled
12. stirringstirring
13. customto give a biphasic solution
14. stirringwith stirring
15. stirringThe reaction was stirred for 16 hours
16. customA precipitate formed overnight
17. customwas collected in a sintered glass funnel
18. customThe solid was dried on a vacuum oven for 16 h