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前文曾讨论过偶数碳原子链烯烃环加成反应的 MO 对称性问题,得到一些有意义的结果。有关奇数碳原子共轭烯烃环加成反应的理论文章不多,而且没有得到明确的结沦。借助于唐——孙的局部群和 HMO 方法对这类反应进行了处理,其结果说明 HMO 法完全可用于讨论烯烃环加成反应的奇数π电子体系,并且证明了环加成反应的 MO 特征根曲线满足于不相交原理,还得出该反应选择定则的奇偶形式。
Previously, we discussed the MO symmetry problem of cyclic addition reaction of even-numbered carbon atoms and obtained some meaningful results. There are not many theoretical articles on the cycloaddition reaction of odd-numbered carbon atom conjugated olefins, and no definite conclusion has been obtained. This kind of reaction was processed by means of the Don-Sun partial group and the HMO method. The results show that the HMO method can be completely used to discuss the odd π electron system of the olefin cycloaddition reaction and prove the MO characteristics of the cycloaddition reaction The root curve is satisfied by the disjoint principle, and the odd and even forms of the reaction selection rule are also obtained.