高等学校化学学报 ›› 2002, Vol. 23 ›› Issue (12): 2256.

• 研究论文 • 上一篇    下一篇

吡啶气相光氯化反应机理的理论研究──夺氢机理过渡态和IRC解析

王万得, 杨恩翠, 郝金库, 赵小军, 曹映玉, 韩晓燕   

  1. 天津师范大学化学与生命科学学院, 天津300074
  • 收稿日期:2001-09-26 出版日期:2002-12-24 发布日期:2002-12-24
  • 通讯作者: 郝金库(1945年出生),男,教授,博士生导师,从事应用量子化学和催化化学研究.E-mail:Haoeyou@eyou.com E-mail:Haoeyou@eyou.com
  • 基金资助:

    国家重点科技攻关项目(批准号:95160101)资助

Theoretical Study on the Mechanism of Gaseous Phase Photochemical Chlorination of Pyridine──The Transition State and IRC Analysis of Abstracting Hydrogen Mechanism

WANG Wan-De, YANG En-Cui, HAO Jin-Ku, ZHAO Xiao-Jun, CAO Ying-Yu, HAN Xiao-Yan   

  1. School of Chemistry and Life Science, Tianjin Normal University, Tianjin 300074, China
  • Received:2001-09-26 Online:2002-12-24 Published:2002-12-24

摘要: 氯自由基与吡啶分子发生夺氢反应生成2-氯吡啶、3-氯吡啶和4-氯吡啶等不同产物主要由两个连续的基元反应组成.研究了生成不同氯代产物的每一个基元反应过渡态,计算比较了不同反应路径活化能的高低,结果表明,不同产物以生成2-氯吡啶的活化能最低,生成2-氯吡啶两个连续基元反应的活化能分别为8.33kJ/mol和1.51kJ/mol,反应优先生成2-氯吡啶,并对邻位反应路径进行了键级、净电荷密度和IRC解析.

关键词: 吡啶, 光氯化, 过渡态, IRC, PM3

Abstract: The abstraction hydrogen mechanism of pyridine reacted with chlorine radical consists of two elementary reactions. Both elementary reactions were studied of leading to three chlorinated products, searching for the TS location, calculating and comparing the activation barriers. The result show that the activation barrier of leading to 2-chloropyridine was the lowest of the three paths, the activation barriers of the two consequent elementary reactions were 8.33 and 1.51 kJ/mol, respectively, so 2-chloropyridine was the prior product. And the bond order, the net charge and IRC along ortho-path were also analyzed.

Key words: Pyridine, Photochemical chlorination, Transition state, IRC, PM3

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