Chinese Journal of Magnetic Resonance

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STUDY OF 17O-NMR CHEMICAL SHIFTS OF HYDROXY-CONT AINED COMPOUNDS

LI Li-dong, LI Lin-sheng*   

  1. Research Center of Applied Chemistry,  University of Science and Technol ogy of Shanxi,  Xianyang 712081,  China
  • Received:2001-11-05 Revised:2002-01-03 Published:2002-06-05 Online:2002-06-05
  • About author:*Correspondence author

Abstract:

Based on systematical induction and summarization of data  o f 17O-NMR chemical shifts of hydroxy-contained compounds already reported,  the article provides the equation(1):  δcal=δ0n+Δα+Δβ+Δγ for primary, secondary, tertiary  alcohol and i-R—OH(em-R refers to substituents whose atom directly connected with hydroxy not telong ed to chain alkane) and equation(2):  δcal=δ0omp for substituted hydroxybenzenes. 15 substituent parameters for calculating the 17O-NMR chemical shifts of alcoho ls  and carboxylic acids and 23 substituent parameters for substituted hydroxybenze nes are gained with regression analysis in connection with least square. Equatio n(1) is checked regressively by the 17O-NMR chemical shifts of 140  compounds of primary, secondary,  tertiary alcohol and i-R—OH,  and equati on(2) is checked regressively by 17O-NMR chemical shifts of 60 compounds of  substituted hydroxybenzenes. Consequently,  their confidence limits both are 99. 5% and calculating errors(4δ) for over 90% compounds are less than (relatio nerrors 0.5%).

Key words: 17O-NMR, chemical shift, substituent ef fect, alcohol, hydroxybenzenes

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