高等学校化学学报 ›› 1991, Vol. 12 ›› Issue (12): 1623.

• 研究论文 • 上一篇    下一篇

2,3-二氰基-2,3-二(p-取代苯基)丁二酸二乙酯的合成及其在苯乙烯中的分解

杨第伦, 齐陈泽, 李兆龙, 刘有成   

  1. 兰州大学化学系, 兰州, 730000
  • 收稿日期:1990-07-11 出版日期:1991-12-24 发布日期:1991-12-24
  • 通讯作者: 杨第伦
  • 基金资助:

    国家自然科学基金

Synthesis of Diethyl 2,3-dicyano-2,3-Bi(p-substituted phenyl)-succinates and Its Decompositions in Styrene

Yang Di-lun, Qi Chen-ze, Li Zhao-long, Liu You-cheng   

  1. Department of Chemistry. Lanzhou University, Lanzhou, 730000
  • Received:1990-07-11 Online:1991-12-24 Published:1991-12-24

摘要: 合成了2,3-二氰基-2,3-二(p-X苯基)丁二酸二乙酯(X=OCH3,CH3,Cl,NO2),分离出它们的meso和dl异构体。经元素分析、1HNMR、IR、MS和X射线晶体结构分析确定了各异构体的结构和构型。在100℃测定了各异构体在苯乙烯中的分解速率常数kd,结果表明,除X=OCH3外,meso异构体的kd均比dl异构体的大,除X=NO2外,苯环对位取代基对kd的影响顺序为OCH3>CH3>Cl>H,

关键词: 2, 3-二氰基-2, 3-二(p-取代苯基)丁二酸二乙酯, 合成, 分解速率常数

Abstract: Diethyl 2,3-dicyano- 2,3-bi(p-Xphenyl)specinates(X=OCH3, CH3,Cl, NO2) were synthesized and meso and dl-isomers were separated for the each diester by fractional recrystal-lization, of which the structures were determined by means of elemental analysis, 1H NMR,IR, MS and X-ray crystallogram analysis. The rate constants of the thermal decomposition of these compounds in styrene at 100℃ were observed by use of dilatometry. The results indicated that kt of meso-isomers with the exception of compound 1 are larger than kd of dl-isomers, and the influence of the p-substituents in benzene ring on kd is in the following order: OCH3>CH3>Cl>H.

Key words: Diethyl 2,3-dicyano-2,3-bi (p-substitutedphenyl) succinates, Synthesis, Thermal decomposition rate constant

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