有机化学 ›› 2011, Vol. 31 ›› Issue (07): 1095-1099. 上一篇    下一篇

研究简报

硼氢化钠还原9-亚芴基丙二腈的反应机理研究

冯乙巳1,2,张博1,杨春燕1,许华建*,1,2   

  1. (1合肥工业大学化学工程学院 合肥 230009)
    (2可控化学与材料化工安徽省重点实验室 合肥 230009)
  • 收稿日期:2010-12-29 修回日期:2011-01-27 发布日期:2011-02-18
  • 通讯作者: 许华建 E-mail:hjxu@hfut.edu.cn

Study on the Mechanism of Reduction of 9- Fluorenylidenemalononitrile with NaBH4

Feng Yisi1,2 Zhang Bo1 Yang Chun-yang1 Xu Huajian*,1,2   

  1. (1 School of Chemical and Engineering, Hefei University of Technology, Hefei 230009)
    (2 Anhui Key Laboratory of Controllable Chemistry Reaction & Material Chemical En-gineering, Hefei 230009)
  • Received:2010-12-29 Revised:2011-01-27 Published:2011-02-18
  • Contact: XU Hua-Jian E-mail:hjxu@hfut.edu.cn

主要研究了在脱氧及氧气饱和条件下, NaBH4还原9-亚芴基丙二腈(FDCN)的反应. 实验结果表明: NaBH4在反应中会发生电子转移, 反应首先产生α-位碳负离子. 在脱氧条件下, α-位碳负离子经质子淬灭形成相应的还原产物, 在CH3CN-CH3OD组成的混合溶剂中, 主要的产物是9-d-FDCNH, 并且延长反应时间和提高温度都会提高它的产率|在氧气饱和条件下, 会有氧化产物9-芴酮(FDO)的生成. 这些表明反应通过一个非完全协同的负氢转移机理来进行, 即电子转移稍快于氢原子转移.

关键词: 硼氢化钠, 9-亚芴基丙二腈, 还原反应, 电子转移

The reduction of 9-fluorenylidenemalononitrile (FDCN) by NaBH4 in oxygen-free and saturated oxygen condition was studied respectively in this paper. The results showed that electron transfer can occur and α-carbon-anion produced firstly in the reaction system. In oxygen-free condition, the proton attacked α-carbon-anion to generate the corresponding reduction product. In the CH3CN-CH3OD mixed solvent, the yield of major product 9-d-FDCNH was improved on prolonging the reaction time or increasing reaction temperature. In saturated oxygen solution, the generation of oxidation product 9-fluorenone (FDO) was due to the incoordinate hydride transfer mechanism. In other words, electron transfer was slightly faster than hydrogen atom transfer.

Key words: NaBH4, FDCN, reduction reaction, electron transfer