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http://dx.doi.org/10.5012/bkcs.2009.30.7.1579

Kinetic Studies on the Nucleophilic Substitution Reaction of 4-X-Substituted-2,6-dinitrochlorobenzene with Pyridines in MeOH-MeCN Mixtures  

Sung, Ryun-Youn (Department of Chemistry Education and Research Institute of Natural Science, Gyeongsang National Univer)
Choi, Ho-june (Department of Chemistry Education and Research Institute of Natural Science, Gyeongsang National University)
Lee, Jong-Pal (Department of Chemistry, Dond-A University)
Park, Jong-Keun (Department of Chemistry Education and Research Institute of Natural Science, Gyeongsang National University)
Yang, Ki-Yull (Department of Chemistry Education and Research Institute of Natural Science, Gyeongsang National University)
Koo, In-Sun (Department of Chemistry Education and Research Institute of Natural Science, Gyeongsang National University)
Publication Information
Bulletin of the Korean Chemical Society / v.30, no.7, 2009 , pp. 1579-1582 More about this Journal
Abstract
The reaction rates of 4-X-2,6-dinitrochlorobenzenes (X = $NO_2,\;CN,\;CF_3$) with Y-substituted pyridines (Y = 3-$OCH_3,\;H,\;3-CH_3,\;4-CH_3$) in methanol-acetonitrile mixtures were measured by conductometry at 25 ${^{\circ}C}$. It was observed that the rate constant increased in the order of X = 4-$NO_2\;>\;4-CN\;>\;4-CF_3$ and the rate constant also increased in the order of Y = 4-$CH_3\;>\;3-CH_3\;>\;H\;>\;3-OCH_3$. When the solvent composition was varied, the rate constant increased in order of MeCN > 50% MeOH > MeOH. The electrophilic catalysis by methanol may be ascribed to the formation of hydrogen bonds between alcoholic hydrogen and nitrogen of pyridines in ground state. Based on the transition parameters, ${\rho}_S,\;{\rho}_N,\;{\beta}_Y,\;{\rho}_{XY}$ and solvent effects, the reaction seems to proceed via $S_N$Ar-Ad.E mechanism. We also estimated the isokinetic solvent mixtures (${\rho}_{XY}$ = 0) based on cross-interaction constants, where the substituent effects of the substrate and nucleophile are compensated.
Keywords
Hydrogen bond; $S_{n}$Ar-Ad.E mechanism; Cross-interaction constants; Isodielectric solvents; Isokinetic solvent mixtures;
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Times Cited By Web Of Science : 2  (Related Records In Web of Science)
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