波谱学杂志 ›› 1988, Vol. 5 ›› Issue (3): 233-244.

• 研究论文 • 上一篇    下一篇

拟除虫菊酯类农药的NMR研究Ⅰ.α-对取代苯基异戊酸及其类似化合物的手性和前手性NMR研究

焦钉, 沈其丰   

  1. 北京农业大学
  • 收稿日期:1987-10-16 修回日期:1987-12-16 出版日期:1988-09-05 发布日期:2018-01-22
  • 基金资助:
    中国科学院自然科学基金资助

NMR STUDIES ON SYNTHETIC PESTICIDES I. NMR STUDIES ON CHIRALITY AND PROCHIALITY OF α (P-CI-PHENYL) ISOAMYL ACID AND ITS ANALOQUES

Jiao Ding, Shen Qifeng   

  1. Beijing Agricultural University
  • Received:1987-10-16 Revised:1987-12-16 Online:1988-09-05 Published:2018-01-22

摘要: α-对取代苯基异戊酸是合成拟除虫菊酯的重要中间化合物,其结构中有手性和前手性两个甲基。为了解构效与活性的关系,本文对其结构特点进行了仔细的考察。用手性位移试剂Eu(hfbc)3和位移试剂Eu(fod)3-分离了对映体的1H和13C的信号,并作出了一定的解释,为鉴定化合物的光学纯度找出了一种简便的方法。对异丙基上的两个非对映异位甲基作了详细的观察,确定了优势构象,并对其作了标识,实验与由简单模型的计算结果一致。本文认为在对这两个非对映异位甲基信号位移差别大小的影响中,取代基的体积效应起了相当重要的作用。

关键词: 手性, 前手性, 手性位移试剂, 顺磁位移

Abstract: α(p-cl-phcnyl) isoamyl acid is an important intermediate of synthetic pyr-ethroid. There are a chiral center and two prochiral methyl groups iu its structure. In order to understand the co-relation between structure and bioactivily, one must give a detailed observation on its stuclural specifications. Our work included the separation of 1H and 13C signals of the enanfiomers with chiral LSR Eu (hfbc)3 and LSR Eu (fod)3, assignments of the diastereotopic methyl groups and the corelation between the magnitude of the anisochrony produced by the methyl groups and neighbor substitutes. Experimenls coincide with the calculation results from a simplified model.

Key words: Chirality, Prochirality, Chiral LSR, Paramagnetic shift