| 单取代苯分子中的电荷分布与定位效应 |
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| 引用本文： | 袁汉杰. 单取代苯分子中的电荷分布与定位效应[J]. 高等学校化学学报, 1987, 8(6): 551 |
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| 作者姓名： | 袁汉杰 |
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| 作者单位： | 第三军医大学化学教研室 |
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| 摘 要： | 本文报道了一种简便计算一元取代苯分子中碳原子电荷分布的新方法,找出了判断定位效应的经验规则。
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| 收稿时间： | 1985-12-25 |
Orientation Effect and Charge Distribution in Monosubstituted Benzenes |
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| Yuan Hanjie. Orientation Effect and Charge Distribution in Monosubstituted Benzenes[J]. Chemical Research In Chinese Universities, 1987, 8(6): 551 |
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| Authors: | Yuan Hanjie |
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| Affiliation: | Teaehing and Research Section of Chemistry, The Third Military Medical College, Chongqing |
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| Abstract: | A simple and new method for calculating charge distributions at ortho-, meta-and para-positions,δQo, δQmand δQp, in monosubstituted benzene molecules is presented. Several empirical rules to judge orientation effect in aromatic electrophilic substitution reactions are found. These are:1.when δQp/δQm>1 but △δQ<0, groups of this kind are ortho-and para-position directing with activation; 2. when δQp/δQm>l but △δQ>0, groups of this kind are ortho- and para-position directing with deactivation; 3. when δQp,/δQm<1 but △δQ>0, groups of this kind arc meta-position directing with deactivation. |
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