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Title: Aromatic nucleophilic substitution reactions 2-chloro-1-methylpyridinium iodide with phenols
Authors: Kabir, Mahbub
Awwal, Abdul
Hossain, Delwar
Bizly, Nasima K
Issue Date: Aug-2004
Publisher: NISCAIR-CSIR, India
IPC Code: Int. Cl.7 C 07 C 39/04
Abstract: The kinetics and mechanism of nucleophilic substitution reactions 2-chloro-1-methylpyridinium iodide (PI) with different phenols have been studied spectrophotometrically. The reactions are first-order with respect to PI and phenols and the overall reaction order is second. The Bronsted coefficient β for the series is 0.09 ± 0.02, which is in agreement for the nucleophilic substitution reactions. From the Hammett correlation, ρ found to be -0.29 ± 0.07. Activation parameters for the substitution reactions have been reported. The isokinetic temperature is calculated (321 K) and it is observed that the substitution reactions are enthalpy controlled. A two-step reaction mechanism is consistent with the observed results in which the formation of an intermediate is rate determining.
Page(s): 1779-1781
ISSN: 0975-0983(Online); 0376-4699(Print)
Appears in Collections:IJC-B Vol.43B(08) [August 2004]

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