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★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ nirenjie0627(金币+30, 翻译EPI+1):谢谢啦! 2010-10-17 20:09:51 ringzhu(金币+30): 2010-11-20 11:27:43 ringzhu(金币+10):完全发放悬赏金币 偶给你讨回来的 哈哈 记得谢偶哦~~~ 2010-11-20 11:28:12
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Weigh 63.6g of diethylene glycol and put it in four flasks. Take 348ml of PBr into the constant pressure dropping funnel, turn on the heating power after installing condenser, off-gas absorption and mixing device, and then drop slowly PBr3 into the four flasks with 2 hours controlling the reaction temperature at 90℃ during this process, continuing reflux reaction within 6 hours. Reaction products are washed with 10% solution of NaHCO3 and distilled water each for 3 times. Add 1.5g of anhydrous magnesium sulfate into the separation of the organic phase, after 2 minutes of stirring and putting aside for 30 minutes, and get 125.8g of 1-bromo-2-(2-bromo ethoxy yl) ethane intermediate by filtering, and the coefficient of yield is 90.4% (by the amount of adiethylene glycol). And preserve and backup the products. |
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