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Title: Kinetic assessment of relative counterion penetration into cationic micelles: Effects of inert salt on the rate of piperidinolysis of phenyl salicylate in alkaline cationic micellar medium
Authors: Khan, M Niyaz
Ismail, Emran
Keywords: Kinetics
Reaction mechanisms
Micellar reactions
Counterion penetration
Micellar penetration
Issue Date: Jun-2009
Publisher: CSIR
Series/Report no.: Int. Cl.<sup>8</sup> C07B41/00
Abstract: <smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="metricconverter"> Pseudo-first order rate constants for piperidinolysis of ionized phenyl salicylate, obtained at 0.1 <i style="">M</i> piperidine, constant concentration of CTABr micelles and varying values of [NaOC<sub>6</sub>H<sub>4</sub>CO<sub>2</sub>Na], follow the empirical relationship: <i>k</i><sub>obs</sub> = (<i>k</i><sub>0</sub> + q <i>K</i><sup>X/S</sup>[MX])/(1 + <i>K</i><sup>X/S</sup>[MX]), where q and <i>K</i><sup>X/S</sup> are empirical constants, MX = NaOC<sub>6</sub>H<sub>4</sub>CO<sub>2</sub>Na and <i>k</i><sub>0</sub> = <i>k</i><sub>obs</sub> at [MX] = 0. The values of q and <i>K</i><sup>X/S</sup> are explained in terms of pseudophase micellar model coupled with an empirical relationship: <i>K</i><sub>S</sub> = <i>K</i><sub>S</sub><sup>0</sup>/(1 + <i>K</i><sub>X/S</sub>[MX]), where <i>K</i><sub>X/S</sub> is an empirical constant and <i>K</i><sub>S</sub> and <i>K</i><sub>S</sub><sup>0</sup> are CTABr micellar binding constants of PS<sup>-</sup> (i.e., S = PS<sup>-</sup>) in the presence and absence of MX, respectively. </smarttagtype>
Description: 781-787
ISSN: O975-0975 (Online); 0376-4710 (Print)
Appears in Collections:IJC-A Vol.48A(06) [June 2009]

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