The characteristic n.m.r. behaviour shown by the spirodimer (IIIa) from α-tocopherol, and its behaviour in ascorbic acid reductions, shows a dependence upon acid catalysis explicable in terms of a phenoxylium ion (X) and designates one area in which oxidative coupling of phenols would have ionic rather than radical mechanisms.
M. Chauhan, F. M. Dean, K. Hindley and M. Robinson, J. Chem. Soc. D, 1971, 1141 DOI: 10.1039/C29710001141
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