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一、前言 Woodward和Hoffmann提出轨道对称性守恒原理以说明电环合、电开环环加成和σ迁移等基元协同反应。对称性守恒原理对于电环合和电开环反应的说明是很清楚的。但对于说明环加成和σ迁移,特别是异面反应则不十分清楚。唐敖庆和赵学庄用联合对称性来说明后面两种反应,他们由群的对称性从理论上说明这些反应的可能性。
I. INTRODUCTION Woodward and Hoffmann proposed the principle of conservation of orbital symmetry to illustrate the coordinated reactions of elementary elements such as electric ring-opening, electrical ring-opening ring addition and σ-migration. The principle of conservation of symmetry is clear for the description of ring-opening and ring-opening reactions. However, it is not very clear to elucidate the cycloaddition and σ migration, especially the heterogeneous reaction. Tang Ao-qing and Zhao Xue-zhuang use joint symmetry to illustrate the latter two reactions, which theoretically explain the possibility of these reactions by the symmetry of the group.