波谱学杂志 ›› 2005, Vol. 22 ›› Issue (4): 401-408.

• 研究论文 • 上一篇    下一篇

取代苯甲酰卤羰基17O-NMR化学位移的研究

  

  1. 陕西科技大学 应用化学研究所,陕西 咸阳   712081
  • 收稿日期:2004-12-27 修回日期:2005-07-08 出版日期:2005-12-05 发布日期:2005-12-05
  • 基金资助:

    陕西省自然科学基金资助项目(2003B17).

Calculation of 17O-NMR Chemical Shifts of Carbonyl Groups in Substituted Benzoyl Halides

  1. Institute of Applied Chemistry, Shaanxi University of Science and Technology, Xianyang 712081, China
  • Received:2004-12-27 Revised:2005-07-08 Online:2005-12-05 Published:2005-12-05
  • Supported by:

    陕西省自然科学基金资助项目(2003B17).

摘要:

按照苯甲酰氯、苯甲酰氟和苯甲酰溴三类化合物,提出了一个计算这三类化合物羰基17O-NMR化学位移的公式:δcal=δ0n+C×(Δomp),通过线性回归法确定了13种取代基参数,经回归检验表明该公式的置信度为99.5%,与实验值的偏差Δδ在5.0以内的羰基17O-NMR化学位移计算值在90%以上.

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

Abstract:

Based on chemical shift measurements in benzoyl fluorides, benzoyl chlorides and benzoyl bromides, an equation: δcal=δ0n+C×(Δomp)  for calculating carbonyl 17O-NMR chemical shifts of benzoyl halides was formulated. Thirteen substituent parameters were obtained with leastsquare linear regression. Experimentally measured 17O chemical shifts of 39 substituted benzoyl halides were used as the test set to examine the accuracy of the calculated results. The confidence limit was found to be 99.5% and the calculating errors for above 90% compounds were less than 5.0 (relative error≤0.5%).

Key words: 17O-NMR, chemical shift, substituent effect, least square regression analysis, benzoyl halide

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