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13.6 Interpreting Proton NMR Spectra
www.columbia.eduthan NMR can detect them. An NMR spectrum is the weighted average of the conformations. For example: Cyclohexane gives a single peak for its H atoms in NMR. Half of the time a single proton is axial and half of the time it is equatorial. The observed chemical shift is half way between the axial chemical shift and the equatorial chemical shift.
Paramagnetic NMR
xuv.scs.illinois.eduStructural Uses of Paramagnetic NMR Paramagnetic effects are measured as differences in NMR spectra recorded from the target molecule in the paramagnetic and diamagnetic states. Data measured with a paramagnetic ion must be compared with corresponding data obtained with a chemically similar but diamagnetic metal ion. Diamagnetic Reference