反应详情

温度

100 °C

Into a 2 liter 5-necked round bottom flask fitted with a mechanical stirrer, Dean-Stark trap topped with a nitrogen padded reflux condenser and a thermocouple attached to a temperature controller, are placed DMSO (650 ml) and toluene (200 ml). While the stirred solution is purged with nitrogen, 9,9-bis(4'-hydroxyphenyl)fluorene (200.0 g, 0.57 mole) is added to the flask. While purging with nitrogen continues, potassium hydroxide (85% pellets, 77.5 g, 1.17 mole) is added all at once, and the mixture is heated to 100° C. with constant stirring. After two hours, the temperature is increased until the solution begins to reflux (130° C.). Water is removed by azeotropic distillation for 24 hours. The Dean-Stark trap is replaced by a Soxhlet extractor containing anhydrous sodium sulfate, and the toluene is refluxed through the Soxhlet for 5 hours. A small amount of toluene (60 ml) is then removed by simple distillation. Then the reactor is cooled to 35° C. Addition of 1,2-dibromotetrafluoroethane (315 g, 1.21 mole) via dropping addition funnel is then maintained at a rate that keeps the reaction temperature at 35°-38° C. When the addition is complete, the mixture is heated at 50° C. for 8 hours, then cooled to room temperature with constant stirring. The mixture is filtered, and the precipitate is washed twice with acetone. The filtrates are combined and evaporated thoroughly. The residue from the evaporation is washed with water to remove residual potassium bromide (KBr). After the residue is air dried for 24 hours, it is purified by column chromatography (on neutral alumina, using hexane eluent) to provide as product, 9,9-bis(4'-[2"-bromotetrafluoroethoxy]phenyl)fluorene (331.4 g, 0.468 mole, 82% yield), melting point 157°-158° C.

1. customInto a 2 liter 5-necked round bottom flask fitted with a mechanical stirrer
2. temperaturepadded reflux condenser
3. additionis added to the flask
4. customWhile purging with nitrogen
5. temperaturethe temperature is increased until the solution
6. temperatureto reflux (130° C.)
7. customWater is removed by azeotropic distillation for 24 hours
8. additioncontaining anhydrous sodium sulfate
9. temperaturethe toluene is refluxed through the Soxhlet for 5 hours
10. customA small amount of toluene (60 ml) is then removed by simple distillation
11. temperatureThen the reactor is cooled to 35° C
12. additionaddition funnel
13. temperatureis then maintained at a rate that
14. customat 35°-38° C
15. additionWhen the addition
16. temperaturethe mixture is heated at 50° C. for 8 hours
17. temperaturecooled to room temperature with constant stirring
18. filtrationThe mixture is filtered
19. washthe precipitate is washed twice with acetone
20. customevaporated thoroughly
21. customThe residue from the evaporation
22. washis washed with water
23. customto remove residual potassium bromide (KBr)
24. customdried for 24 hours
25. customit is purified by column chromatography (on neutral alumina, using hexane eluent)
26. customto provide as product