反应详情

温度

4 °C

90.1 g of acrylic acid (1.25 mol), 29.8 g of 4-(6-hydroxyhexyloxy)benzoic acid, 4.5 g of hydroquinone, 4.5 g of p-toluenesulfonic acid and 300 ml of chloroform were placed in a sulfonation flask having a stirrer, water separator and reflux condenser. The mixture was heated to reflux for about 20 hours and then treated with a solution of 3.25 g of sodium acetate trihydrate in 10 ml of water. The chloroform and the excess acrylic acid were subsequently distilled off on a rotary evaporator. The residue was taken up in 1.5 1 of chloroform. The mixture was stirred for 2 hours and then filtered. The filtrate was washed three times with 200 ml of water each time, dried over sodium sulfate, filtered and concentrated. The residue was dissolved in 500 ml of toluene and the solution was again filtered. The filtrate was cooled to 4° C. for 12 hours and then to -20° C. for a further 12 hours. The crystalline product obtained was removed by filtration under suction, washed twice with cold toluene and again recrystallized from 400 ml of toluene. After drying at 60° C./40 mbar there were obtained 29.2 g of 4-(6-acrylyloxyhexyloxy)benzoic acid with m.p. (C-N) 92° C. and cl.p. (N-I) 110° C.

1. temperatureThe mixture was heated
2. temperatureto reflux for about 20 hours
3. distillationThe chloroform and the excess acrylic acid were subsequently distilled off on a rotary evaporator
4. filtrationfiltered
5. washThe filtrate was washed three times with 200 ml of water each time
6. dry with materialdried over sodium sulfate
7. filtrationfiltered
8. concentrationconcentrated
9. dissolutionThe residue was dissolved in 500 ml of toluene
10. filtrationthe solution was again filtered
11. waitto -20° C. for a further 12 hours
12. customThe crystalline product obtained
13. customwas removed by filtration under suction
14. washwashed twice with cold toluene
15. customagain recrystallized from 400 ml of toluene
16. customAfter drying at 60° C./40 mbar there