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Unformatted text preview: 5 per second. This is sufficiently fast for the environments of the axial and equatorial H to be time-averaged in the nmr experiment. At low temperature, the rate slows down and the two types of H become magnetically nonequivalent. Inversions at Nitrogen in Amines N H X : : A B fast A and B are diastereomers. Although the H in A and B are in different environments, they are not distinguished in the nmr experiment because of fast interconversion that time-averages the environments. Protic H Exchange The protic H in alcohols are generally exchanged rapidlybetween molecules . RO-H + RO-H RO-H + RO-H fast The environment experienced by the protic H depends on the rate of this exchange....
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