R. Ranjbar‐Karimi, Alireza Poorfreidoni
Apr 1, 2017
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Journal
Journal of the Iranian Chemical Society
Abstract
Abstract4-Phenylsulfonyl-2,3,5,6-tetrachloropyridine was synthesized from the reaction of sodium phenylsulfinate with pentachloropyridine in optimized reaction condition. The reaction of some mono- and bidentate N and O nucleophiles with 4-phenylsulfonyl-2,3,5,6-tetrachloropyridine was studied in order to assess the impact of electron-withdrawing functional group (PhSO2−) upon regiochemistry of aromatic nucleophilic substitution. Substitution generally occurs at 4-position of pyridine ring, by less steric hindrance nucleophiles although mixtures of products (ortho- and para-substituted) are obtained with more steric hindrance cases. The structures of all the compounds were confirmed by IR, 1H NMR and 13C NMR spectroscopy as well as elemental analysis and X-ray crystallography.Graphical Abstract