波谱学杂志

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链状脂肪醚的17O-NMR化学位移研究

李利东,李临生*   

  1. 陕西科技大学应用化学研究所,陕西咸阳 712081
  • 收稿日期:2002-01-08 修回日期:2002-03-11 出版日期:2002-12-05 发布日期:2002-12-05
  • 作者简介:李利东(1976-),男,内蒙古包头人,博士研究生,高分子化学与物理专业.*通讯联系人

STUDY OF 17O-NMR CHEMICAL SHIFTS OF CHAINED ALIPHATIC ETHERS

LI Li-dong, LI Lin-sheng*   

  1. Research Center of Applied Chemistry in University of Science and Technology of Shann'xi, Xianyang, 712081, China
  • Received:2002-01-08 Revised:2002-03-11 Online:2002-12-05 Published:2002-12-05
  • About author:*Correspondence author

摘要:

按甲基醚、乙基醚、正丙基醚、异丙基醚和叔丁基醚等五大类,提出了计算链状脂肪醚17O-NMR化学位移的公式:δcal =δ0n+Δα+ Δβ+Δγ,并通过线性回归法结合最小二乘法得到29种取代基的参数,计算结果用以上五大类147种化合物的147个17 O-NMR化学位移数据为样本点作回归检验,置信度为99.5%,计算误差Δδ小于5.0(相对误差小于0.5%)的17O-NMR化学位移计算值约占90%.

关键词: 17O-NMR, 化学位移, 取代基效应, 回归分析, 最小二乘法,

Abstract:

Based on the results from five compounds: methylether, ethylether, n-propyleth er, em-propylether and t-butylether, an empirical equation: δcal=δ0n+Δα+Δβ+Δγ (Eq. [1]) was derived for calculating the 17O-NMR chemical shifts of  chained aliphatic ethers. Parameters were obtained for 29 substituents using lin ear regression in combination with least square analysis. The validity of Eq. [1] was checked regressively by 147 17O-NMR chemical shifts of 147 chained aliphat ic ethers. The confidence limit was 99.5 % and the calculating errors of about 9 0 % compounds were less than 5 ppm (relative errors 0.5 %).

Key words: 17O-NMR, chemical shift, substituent effect, regression analys is, least square, ether

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