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Quantitative treatment of the effect of counterions on ctab-catalyzed reactions of stabilized carbonium ions with cyanide ion

✍ Scribed by S. K. Srivastava; Sarvagya S. Katiyar

Publisher
John Wiley and Sons
Year
1982
Tongue
English
Weight
432 KB
Volume
14
Category
Article
ISSN
0538-8066

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✦ Synopsis

Abstract

The reactions of stabilized carbonium ions of setoglaucin, methyl violet, and ethyl violet with cyanide ions are largely catalyzed by the cationic micelles of cetyltrimethylammonium bromide (CTAB) in aqueous media. Added counterions (anions in this case) have strong inhibitory effects on the CTAB‐catalyzed reactions in the following order: N > NO > Br^−^ > Cl^−^ > F^−^ > no salt. The inhibitory effects of the counterions have been attributed to the exchange between added anions and reagent (CN^−^) in the micellar media. The data have been analyzed by the model schemes, and mathematical formulations were developed. Various parameters associated with the exchange process, such as equilibrium exchange constant, number of surfactant molecules per substrate molecule, number of added anions, and a factor related to the binding of additives to the catalytic micellar aggregates, have been evaluated.

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