| 查看: 847 | 回复: 3 | |||
| 本帖产生 1 个 翻译EPI ，点击这里进行查看 | |||
[交流]
帮忙翻译一段德文（化学实验相关，译成中文英文都行），比较急谢谢
|
|||
  |
回复此楼» 猜你喜欢
职称评审没过，求安慰
已经有54人回复
-
垃圾破二本职称评审标准
已经有19人回复
-
毕业后当辅导员了，天天各种学生超烦
已经有5人回复
-
26申博自荐
已经有3人回复
-
A期刊撤稿
已经有4人回复
2楼2010-11-01 10:30:25
3楼2010-11-01 13:54:56
jsw79(金币+50, 翻译EPI+1):Thanks! 2010-11-01 14:34:03
| general procedure for Nickel(0)-mediated coupling of halomethoxy pyridine to dimethoxybipyridine: To a solution of 7.15g (30mmmol) of NiCl2.6H2O and 31.5g (120mmol) of triphenyl phosphane in 200ml of DMF under nitrogen atmosphere(1bar) is added 1.97g (30mmol) of Zn dust, the reaction mixture is stirred for 1h at 50℃. Subsequently 30mmol of halogmethoxy pyridine ( or the mixture of halomethoxy pyridines) is added and the mixture is stirred for 5-120 h (see Table 1) at 50℃. The reaction mixture is poured into 800ml of half concentrated NH3 and stirred for 1h and the aqueous phase is extracted 3 times with each of 150ml of CHCl3. The combined organic phase was completely evaporated and the residue is taken up in 300ml of CHCl3. The solution is extracted 5 times with each of 100ml of half concentrated HCl. The combined aqueous phase is extracted with 50ml of CHCl3 and subsequently made alkaline with aqueous Na2CO3 solution. The aqueous phase is extracted 4 times with each of 100ml of CHCl3, the combined organic phase was dried with Na2SO4 and concentrated to dryness. The residue is purified chromatographically on silica gel with the eluent MDC/2% MeOH or directly recrystallized from ethanol. |
4楼2010-11-01 14:05:33