Quantitative CIDNP measurements have been made on the Stevens rearrangements of the ylides (1a–e); the experimental enhancement factors (Vexp) are 25% or less than would be expected for a reaction proceeding only by a free radical pathway.
U. H. Dolling, G. L. Closs, A. H. Cohen and W. D. Ollis, J. Chem. Soc., Chem. Commun., 1975, 545 DOI: 10.1039/C39750000545
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