反应 #684944

反应方程式

2,5-Dibromohydroquinone

sodium hydroxide

dodecylbromide

→

2,5-Dibromo-4-dodecyloxy phenol

收率 60.0%

溶剂

ethanol

反应条件

后处理

1. 1
   温度the reaction mixture was cooled
2. 2
   其他the precipitate formed
3. 3
   过滤was filtered
4. 4
   洗涤washed with methanol
5. 5
   其他The filtrate was evaporated
6. 6
   其他to remove the solvent
7. 7
   workup.ADDITION2 L of distilled water was added to the residue
8. 8
   workup.WAITboiled gently for 1 h
9. 9
   温度cooled
10. 10
    过滤The resulting precipitate was collected by filtration
11. 11
    洗涤washed with water
12. 12
    其他dried in vacuo
13. 13
    其他The crude product was purified by column chromatography
14. 14
    workup.ADDITIONa mixture of solvents (CH2Cl2:hexanes, 4:6)
15. 15
    其他to get the pure product in 60% yield

实验过程

2,5-Dibromohydroquinone 3 (40.2 g, 0.15 mol) was dissolved in a solution of sodium hydroxide (9.2 g, 0.23 mol) in 1.5 L of absolute ethanol at room temperature under nitrogen atmosphere. The reaction mixture was warmed to 50-60° C. with constant stirring. The dodecylbromide (36 ml, 0.15 mol) was added drop wise to the above reaction mixture at 60° C. After 10 h of stirring under nitrogen atmosphere, the reaction mixture was cooled and the precipitate formed was filtered and washed with methanol. This precipitate was identified as dialleylated-2,5-dibromohydroquinone as a side product. The filtrate was evaporated to remove the solvent. 2 L of distilled water was added to the residue and the mixture was acidified with 36% HCl, boiled gently for 1 h and cooled. The resulting precipitate was collected by filtration, washed with water and dried in vacuo. The crude product was purified by column chromatography using a mixture of solvents (CH2Cl2:hexanes, 4:6) to get the pure product in 60% yield.

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