电环化反应规律与教学实践

The Rules and Teaching of Electro Cyclic Reaction

电环化反应是周环反应的一类,对于理解和掌握分子轨道理论非常有帮助,掌握了不同P电子的分子轨道形状和能量,但快速准确得到电环化反应立体结构产物也是不易的。分子轨道是原子轨道的线形组合,采用前线轨道理论解释电环化反应机理,并根据前线轨道对称性判别反应中分子轨道的旋转方式,从而得到立体专一性结构的产物。

The electro cyclic reaction is a kind of pericyclic reaction. It is very helpful to understand and grasp the molecular orbital theory. It is not easy to obtain the stereo-structure product although people have mastered molecular orbital shape and energy of different P electron. The two atomic orbital can linear combine and produce molecular orbital. The front orbital theory was applied to explain the mechanism of electro cyclic reaction,the rotating way of the molecular orbit was discriminated according the front orbital symmetry of molecular orbital,the stereospecificity product was obtained.