The acid-sensitive 1H nuclear magnetic resonance spectra of tocopherols and other derivatives of 6-hydroxychroman
Abstract
Acids selectively cause the collapse of n.m.r. signals originating from protons attached to, or closely associated with, the 6-hydroxychroman nucleus; the signals are restored by base and it is thought that the effect is produced by an aromatic nucleus that is very easily oxidisable to the cation radical state.