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°®ÓëÓêÏÂ(½ð±Ò+1): 2011-11-08 12:05:17
sxzzg(½ð±Ò+4, ·­ÒëEPI+1): 2011-11-10 18:59:03
table.1 demonstrates that: the reaction could be completed in a short period when the acids contain electron-donating group; for the acids containing weak electron-attracting group, it requires the proper extention of reaction time;  when the acids contain strong electron-attracting group on the other hand, the reaction will not take place even with extending the reaction time or increasing the temprature.
2Â¥2011-11-08 11:58:33
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fjtony163

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°®ÓëÓêÏÂ(½ð±Ò+1): 2011-11-08 12:05:23
sxzzg(½ð±Ò+6): 2011-11-10 18:59:07
As Table 1 mentioned, acid with electron donating group can complete reaction in shorter time and acid with weaker electron drawing group can complete reaction in longer reaction time. However, the acid with strong electron drawing group (e.g. nitro-) cannot react neither when extending reaction time nor raising reaction temperature.
3Â¥2011-11-08 12:01:27
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