- 作者: 劉廣定
- 作者服務機構: Department of Chemistry, National Taiwan University, Taipei, 107 Republic of China
- 中文摘要: The proton magnetic resonance spectra of the two isomeric 2-norbornanols (I and II) and of eighteen of their methyl-substituted derivatives (III to XX) under the influence of tris(dipivalomethanato) europium, Eu(dpm)8, have been measured. In all cases linear relationships between the observed shifts and the molar ratios of Eu(dpm)8 to substrate were realized. The chemical shifts obtained from the extrapolation to zero concentration of Eu(dpm)8 are in good agreement with the observed values. The coupling constants were found to be essentially unaffected by Eu(dpm)8. Consequently, determination of a chemical shift by extrapolation or of a coupling constant form the shifted spectrum appears to be justified. Reassignments of a number of signals are discussed. Chemical shifts, normalized induced shifts, and coupling constants are tabulated.
- 英文摘要: --
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