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.
I. Al-Khayat, F. M. Dean, D. A. Matkin, B. Parvizi, M. L. Robinson and C. Thebtaranonth, J. Chem. Soc., Chem. Commun., 1978, 265 DOI: 10.1039/C39780000265
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