化学学报 ›› 1999, Vol. 57 ›› Issue (8): 887-893. 上一篇    下一篇

研究论文

硫代双烯酮与硫甲醛环加成反应机理的理论研究

王岩;王岩;方德彩;傅孝愿   

  1. 北京师范大学化学系.北京(100875);信阳师范学院化学系
  • 发布日期:1999-08-15

Theoretical studies on the mechanism of the cycloaddition reaction between thioketene and thioformaldehyde

Wang Yan;Wang Yan;Fang Decai;Fu Xiaoyuan   

  1. Beijing Normal Univ., Dept of Chem..Beijing(100875)
  • Published:1999-08-15

采用从头算HF/6-31G^*和密度泛函B3LYP/6-31++G^*^*方法研究了硫代双烯酮与硫甲醛两种可能的环加成反应的机理,并对反应各驻点进行了电子密度拓扑分析研究.结果表明,这两个生成不同四元杂环产物的平行反应均为有一两性离子中间体的分步反应.两个反应均较易进行,但反应(1)更容易一些,结果与实验一致.

关键词: 烯酮P, 从头计算法, 硫甲醛, 环加成反应, 反应机理, 电子密度, 拓扑, 密度函数

Ab initio HF/6-31G^* and density functional theory(DFT) B3LYP/6-31+ +G^*^* have been used to study the mechanism of the cycloaddition riaction between thioketene and thioformaldehyde. These two reactions that give different four-memabered heterocyclic products; both proceed;via a two-step mechanism involving a zwitterionic intermediate. Both processes proceed easily,but reaction(1) is more favorable.In addition, Bader type electron density topological analysis was used to study the electronic structures of stationarypoints for reactions(1)and(2).

Key words: KENONE P, AB INITIO CALCULATION, THIOFORMALDEHYDE, CYCLOADDITION REACTION, REACTION MECHANISM, ELECTRON DENSITY, TOPOLOGY

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