高等学校化学学报 ›› 1988, Vol. 9 ›› Issue (8): 797.

• 论文 • 上一篇    下一篇

4-氯-4'-取代-苯丁酮的低能电子轰击质谱和取代基效应的研究

林孝元, 利群, 唐恢同   

  1. 北京大学化学系
  • 收稿日期:1987-01-24 出版日期:1988-08-24 发布日期:1988-08-24
  • 通讯作者: 林孝元

The Study of Low Energy Electron Impact Mass Spectia of 4-Chloro-4' -Substituted Benzyl Butyl Ketones and Substituent Effect

Lin Xiaoyuan, Li Quo, Tang Huitong   

  1. Department of Chemistry, Peking University, Beijing
  • Received:1987-01-24 Online:1988-08-24 Published:1988-08-24

摘要: 用离子动能谱探讨了9个苯环上不同取代基的4-氯-4′-取代-苯丁酮EI断裂的主要途径是:分子离子先进行Mclafferty重排,而后α-断裂。将电子能量降低至20ev,对Mclafferty重排的产物离子的α-断裂反应用Hammett方程处理,得回归线性方程lgZ/Z0=-0.37σp-0.008,线性相关系数为0.9949。由此可明显地看出质谱中单分子断裂反应的取代基效应。

关键词: 4-氯-4&prime, 取代苯丁酮, 能低电子轰击质谱, 取代基效应

Abstract: The investigation of the pathway of EIfragmentation of 4-chloro-4'-substituted benzyl butyl ketones with nine different ring substituents was accomplished by means of Mass-Analyzed Ion Kinetic Energy Spectra (MIKES). The results showed that the pathway was predominantly composed of Mclafferty Rearrangement of molecular ions followed by α-dissociation. Under lower impact electron energy down to 20eV, the α-disspciation leaction of product ions of Mclafferty Rearrangement could satisfactorily correspond with Hammeit eqtation resulting in the regression linear epuation lgZ/Z0 =-0.378σp-0.008 with correlation coefficient 0.9949. The substituent effect of monofnolecular dissociation in mass spectrometry was obviously shown from present work.

Key words: 4-Chloro-4'-substituted benzyl ketone, Low energy election impact mass spectra, Substituent effect

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