Quality Control of Pyridine-3,5-dicarbonitrile. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: Pyridine-3,5-dicarbonitrile, is researched, Molecular C7H3N3, CAS is 1195-58-0, about Proton chemical shifts of the symmetrically disubstituted pyridines. Author is Wu, Ting Kai.
3,5-Disubstituted pyridines (R2C5H3N, where R = CN, Br, Cl, and Me) and 2,6-disubstituted pyridines (R’2C5H3N, where R’ = NH2, OMe, Me, Cl, Br, and COMe) were studied by N.M.R. spectra to determine the substituent effects on the chem. shifts for further insight into the nature of the shielding mechanisms in the pyridine π-electron system. The additive substituent effects on the proton chem. shifts of the sym. disubstituted pyridines provide further supporting evidence for the interpretation of Wu and Dailey [J. Chem. Phys. 41, 3307(1964)] that the shielding mechanisms in the pyridines are virtually the same as those in benzenes.
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