Dipole-moment measurements show that there is no large interaction in the ground state between the substituent and the heterocyclic group in 4-p-substituted-styryl- and -phenylethynyl-pyridine and their 1-oxides.
A. J. Boulton, G. M. Glover, M. H. Hutchinson, A. R. Katritzky, D. J. Short and L. E. Sutton, J. Chem. Soc. B, 1966, 822 DOI: 10.1039/J29660000822
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