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Effect of colloidal self‐assemblies on the basic hydrolysis of 2‐(4‐bromophenoxy)quinoxaline
Author(s) -
Cuenca Angela
Publication year - 2003
Publication title -
journal of physical organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.325
H-Index - 66
eISSN - 1099-1395
pISSN - 0894-3230
DOI - 10.1002/poc.617
Subject(s) - chemistry , quinoxaline , substrate (aquarium) , pulmonary surfactant , hydrolysis , micelle , cationic polymerization , reaction rate constant , colloid , reaction rate , kinetics , medicinal chemistry , chromatography , organic chemistry , aqueous solution , catalysis , biochemistry , oceanography , physics , quantum mechanics , geology
Abstract In the presence of cationic surfactants (C 16 H 33 NR 3 Cl; R = Me, n‐Pr, n‐Bu), the shape of rate versus surfactant concentration profiles for the basic hydrolysis of 2‐(4‐bromophenoxy)quinoxaline depends on substrate concentration. At low substrate concentration there is a single rate maximum and with a 10‐fold substrate concentration increase a double rate maximum is observed. The first rate maximum is ascribed to reaction occurring in premicellar aggregates and the second to reaction in micelles. At low substrate concentration the effect of surfactant head group size was examined. Second‐order rate constants in the micellar pseudophase increase with increasing head group size. Copyright © 2003 John Wiley & Sons, Ltd.