The e.s.r. spectra of the cis-and trans-radical ions cyclo-Me2But2C4˙+, obtained from methyl-t-butylethyne, can be interpreted in terms of the breaking of the degeneracy of the molecular orbitals in the trans-isomer by more powerful electron release from the t-butyl groups than from the methyl groups.
J. L. Courtneidge, A. G. Davies and J. Lusztyk, J. Chem. Soc., Chem. Commun., 1983, 893 DOI: 10.1039/C39830000893
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