Direct e.s.r. evidence for strong hyperfine interaction with phosphorus, arsenic, or tin atoms β to redical centres is presented, which is linked with the large rate enhancements detected by others when such groups are β to aromatic ring systems; the interaction is shown to be hyperconjugative rather than to involve outer d orbitals.
A. R. Lyons and M. C. R. Symons, J. Chem. Soc. D, 1971, 1068 DOI: 10.1039/C29710001068
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