近十多年来,“分子轨道对称守恒原理”在化学上的应用日益广泛。目前国际上关于这方面的理论主要有:“能量相关理论”,“前线分子轨道理论”以及“芳香过渡态理论”。它们讨论的是协同反应的选律,结论基本一致。我国科学家唐敖庆对这三个理论有明确的评价,并在理论上有新的发展。 In the recent ten years, the principle of symmetry of molecular orbital symmetry has been widely used in chemistry. At present, there are mainly theories in this field in the world: “Energy Related Theory”, “Frontier Molecular Orbital Theory” and “Aromatic Transitional State Theory”. They discuss the synergistic reaction of the law, the conclusion is basically the same. Tang Ao-ching, a Chinese scientist, has made a clear assessment of these three theories and has made new theoretical developments.