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| 在FeCl3和ZnCl2这两种经典的Lewis 酸中,即使在严格的无水无氧条件下,收率也比较低所有被考察的三氯化稀土对该反应均表现出一定的催化活性,但当LaCl3做催化剂时产物的收率仅为10%随着稀土离子半径的减小,收率逐渐升高,YbCl3显示出最好的活性。这与YbCl3在稀土氯化物中显示最强的Lewis酸性是一致的。 |
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huangjie3186(金币+15, 翻译EPI+1): 2011-02-17 16:03:47
| Even under restricted anhydrous and no oxygen condition, the yield was still low by using two classic Lewis acids namely FeCl3 and ZnCl3. All the investigated rare earth element tri-chlorides showed certain catalytic activities. However, when LaCl3 was used as catalyst, the yield was only 10%. The yield could be increased with the decreasing of the diameter of rare earth element ion. YbCl3 showed the best activity. This followed the same trend of Lewis acidity in rare earth element tri-chloride compounds |
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