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http://dx.doi.org/10.5012/bkcs.2008.29.4.851

Pyridinolysis of O,O-Diphenyl S-Phenyl Phosphorothiolates in Acetonitrile  

Adhikary, Keshab Kumar (Department of Chemistry, Inha University)
Lumbiny, Bilkis Jahan (Department of Chemistry, Inha University)
Kim, Chan-Kyung (Department of Chemistry, Inha University)
Lee, Hai Whang (Department of Chemistry, Inha University)
Publication Information
Bulletin of the Korean Chemical Society / v.29, no.4, 2008 , pp. 851-855 More about this Journal
Abstract
The reactions of O,O-diphenyl Z-S-phenyl phosphorothiolates with X-pyridines have been studied kinetically in acetonitrile at $35.0{^{\circ}C}$. The Hammett plots for substituent (Z) variations in the leaving group (log $k_2$ vs. $\sigma$ Z) are biphasic concave downwards with breaks at Z = H. The large magnitudes of ${\rho}X(\rho_{nuc})$, ${\beta}X(\rho_{nuc})$, and the cross-interaction constant, $\rho$XZ, suggest frontside nucleophilic attack toward the leaving group. The sign reversal of $\rho$Z from positive in $\sigma$ Z $\leq$ 0 to negative in $\sigma$ Z $\geq$ 0 is interpreted as the change in mechanism from concerted to stepwise with rate-limiting expulsion of the leaving group. The anomalous negative sign of $\rho$ Z for leaving groups with electron-withdrawing substituents is interpreted as the intramolecular ligand exchange process of the leaving group from the equatorial position in the intermediate to the apical position in the TS.
Keywords
O,O-Diphenyl S-phenyl phosphorothiolate; Pyridinolysis; Cross-interaction constants; Frontside attack; Negative ρZ (ρLg)
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
Times Cited By Web Of Science : 39  (Related Records In Web of Science)
Times Cited By SCOPUS : 41
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