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爱与雨下(金币+1): 2011-11-08 12:05:17
sxzzg(金币+4, 翻译EPI+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.
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