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用相关图讨论两个乙烯分子以协同方式进行环加成反应,涉及到反应物和产物的分子轨道对称守恒,所以需要首先找出反应物和产物共同的对称性元素,然后应用共同的对称性元素将反应物和产物的分子轨道进行分类,从而通过相关图了解两个乙烯分子的π轨道同面接近形成环丁烷反应进程的条件。进一步从分子轨道能级相关图明确反应物分子轨道与产物分子轨道之间的关系。然后再通过电子状态相关图了解反应物状态与产物状态间的关系。
The correlation diagram shows that two ethylene molecules undergo a cycloaddition reaction in a synergistic manner, involving the symmetry conservation of reactants and products. Therefore, it is necessary to first find out the common symmetry elements of reactants and products, and then apply the common symmetry The elements classify the molecular orbitals of the reactants and the products, so that the correlation diagram shows that the π orbitals of the two ethylene molecules are close to the same conditions for the formation of the cyclobutane reaction. The relationship between molecular orbital and product molecular orbital is further clarified from the molecular orbital energy level correlation diagram. And then through the electronic state correlation diagram to understand the relationship between the state of reactants and product status.