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北京石油化工学院2026年研究生招生接收调剂公告
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Usually, a -donor substituent acts as an ortho/para directing group in an electrophilic aromatic substitution reaction, and a -acceptor substituent acts as a meta directing group. Interestingly, when a -acceptor substituent is meta to a -donor substituent, certain electrophilic aromatic nitration occurs ortho to the-acceptor substituent rather than para. The “ortho effect”, highlighted in various textbooks, has been tentatively analyzed here based on ab initio calculations. The reliability of the calculations was verified by the corresponding experimental data, including a newly-designed electrophilic aromatic nitration that also gave reasonable product distributions.

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baoshanqiu

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爱与雨下: 金币+1 2017-03-25 10:33:29
有机合成(fjtony163代发): 金币+50, 代发 2017-05-01 11:00:30
fjtony163: 翻译EPI+1, 代发 2017-05-01 11:00:36
通常在一个亲电芳香取代反应中 a -供体取代基作为邻/对位取向基团,而 a -受体取代基作为间位取向基团。有趣的是,当a -受体取代基对 a -供体取代基取间位时,某些亲电芳香硝化反应对受体取代基取邻位而不是对位。这种“邻位效应”在许多教科书强调过,在此基于从头计算作了探讨性分析。这种计算的可靠性经相应的实验数据得到证实, 其中包括一个新设计的亲电芳香硝化反应也得到了合理的产物分布。
2楼2017-03-24 01:19:44
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