13 C N.m.r. spectra of the dianion of 3-methylbut-2-enoic acid suggest a delocalized structure; ab initio STO/3G calculations show that the only stable delocalized structure is that in which the metal lies above the plane of the molecule, as in simple allylic systems.
A. Bongini, M. Orena and S. Sandri, J. Chem. Soc., Chem. Commun., 1986, 50 DOI: 10.1039/C39860000050
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