反应详情

温度

25 °C

Into a 25 ml 3 neck round bottom flask equipped with magnetic stirrer, pot thermometer, Y tube, nitrogen inlet tube, reflux condenser and heating mantle, is placed a solution of 0.54 g (0.01 moles) of sodium methoxide dissolved in 3 ml absolute methanol. The reaction mass is maintained at 25°-30° C and a solution of 0.64 g (0.005 moles) of 2,5-dimethyl-3-furan thiol in 3 ml absolute methanol is added to the reaction mass. While maintaining the reaction at 25° C, picolyl chloride hydrochloride (0.82 g; 0.005 moles) dissolved in 2 ml absolute methanol is added to the reaction mass. The reaction being exothermic, the reaction mass warms up to 42° C and a white solid precipitate forms. The reaction mass is allowed to cool to 25° C with stirring over a period of 30 minutes. The reaction mass is then heated to reflux (60° - 65° C) under nitrogen and reflux is continued for a period of 1 hour. The reaction mass is cooled to 30° C and flushed with nitrogen. After remaining at room temperature for a period of 20 hours, 10 ml. of water is added to the reaction mass with stirring, causing the reaction mass to now exist in two phases; an aqueous phase and an organic phase. The pH of the reaction mixture is 5. 7 ml of n-hexane is then added to the reaction mass with stirring and transferred into a separatory funnel. The aqueous layer is separated from the organic phase and extracted with 8 ml n-hexane after first diluting the aqueous phase with another 10 ml of water. The hexane extracts are combined, washed with 7 ml of saturated sodium chloride solution, dried over anhydrous sodium sulfate, gravity filtered, and concentrated on a rotary evaporator using water-aspirator vacuum.

1. temperaturepot thermometer, Y tube, nitrogen inlet tube, reflux condenser
2. temperatureheating mantle
3. temperatureThe reaction mass is maintained at 25°-30° C
4. temperatureWhile maintaining
5. customthe reaction at 25° C
6. additionis added to the reaction mass
7. customwarms up to 42° C
8. temperatureThe reaction mass is then heated
9. temperatureto reflux (60° - 65° C) under nitrogen
10. temperaturereflux
11. waitis continued for a period of 1 hour
12. temperatureThe reaction mass is cooled to 30° C
13. customflushed with nitrogen
14. waitAfter remaining at room temperature for a period of 20 hours
15. additionof water is added to the reaction mass
16. stirringwith stirring
17. addition7 ml of n-hexane is then added to the reaction mass
18. stirringwith stirring
19. customtransferred into a separatory funnel
20. customThe aqueous layer is separated from the organic phase
21. extractionextracted with 8 ml n-hexane
22. additionafter first diluting the aqueous phase with another 10 ml of water
23. washwashed with 7 ml of saturated sodium chloride solution
24. dry with materialdried over anhydrous sodium sulfate, gravity
25. filtrationfiltered
26. concentrationconcentrated on a rotary evaporator