An empirical approach to study the occurrence of ion exchange in the ionic micellar-mediated semi-ionic reactions: Kinetics of the rate of reaction of piperidine with ionized phenyl salicylate in the presence of cationic micelles

✍ Scribed by M. Niyaz Khan; Emaran Ismail

• Publisher: John Wiley and Sons
• Year: 2001
• Tongue: English
• Weight: 114 KB
• Volume: 33
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/kin.1023

✦ Synopsis

Pseudo-first-order rate constants (k obs )-obtained for the cleavage of ionized phenyl salicylate (PS Ϫ ) at constant [NaOH], [MeCN], [CTAZ] T (total concentration of cetyltrimethylammonium chloride and bromide), [Pip] T (total concentration of piperidine), and varying concentrations of sodium cinnamate, acetate, and butanoate ([NaX])-follow the relationship:

), where and K are empirical parameters. The values of are almost independent of [CTAZ] T , while K values decrease with the increase in [CTAZ] T within its range 0.006-0.020 M. The values of and K are explained in terms of pseudophase model of micelle coupled with an empirical relationship: K S ϭ K S 0 /(1 ϩ ⌿ X/S [NaX]), where K S is the CTAZ micellar binding constant of PS Ϫ in the presence of NaX.