The effect of electrolytes on the reaction rates and acid-base equilibria in ionic micelles |
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| Authors: | L. Ya. Zakharova S. B. Fedorov L. A. Kudryavtseva V. E. Bel'skii B. E. Ivanov |
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| Affiliation: | (1) A. E. Arbuzov Institute of Organic and Physical Chemistry, Kazan' Scientific Center, Russian Academy of Sciences, 8 ul. Akad. Arbuzova, 420083 Kazan', Russian Federation |
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| Abstract: | The influence of a number of electrolytes on the micellar effect of cetyltrimethylammoniurn bromide (CTAB) in the hydrolysis ofp-nitrophenyl acetate (1) and bis(p-nitrophenyl) methylphosphonate (2) and in the course of the acid-base dissociation of thep-nitroanilide of bis(chloromethyl)phosphinic acid (3) has been examined. The activity of the salts studied increases in the following order: MeCOOK2CO33<p-MeC6H4SO3K. It has been found that in the presence of electrolytes the catalytic effect of CTAB micelles in the hydrolysis reactions of esters1 and2 decreases, and the pKa value of anilide3 increases. The results obtained are interpreted in terms of the pseudophase model of micellar catalysis. The analysis of the experimental data carried out using logarithmic coordinates revealed a relationship between phase transitions in micellar catalysis and in micellization.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1396–1400, August, 1993. |
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| Keywords: | micelles, micellar catalysis micellar phase, aqueous phase, solubilization cetyltrimethylammonium bromide electrolytes substrate hydrolysis acid-base equilibrium |
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