Five methyl-substituted 2-cyclopentadienylidene-1-methyl-1,2-dihydropyridines have been prepared. The chemical shifts of the C-methyl protons are correlated with electron densities calculated in various ways. The best results were obtained by using a self-consistent version of the Hückel method.
G. V. Boyd and N. Singer, J. Chem. Soc. B, 1966, 1017 DOI: 10.1039/J29660001017
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