✦ LIBER ✦

Kinetics and mechanism of alkaline hydrolysis of 4-nitrophthalimide in the absence and presence of cationic micelles

✍ Scribed by M. Niyaz Khan; Zunoliza Abdullah

Publisher: John Wiley and Sons
Year: 2001
Tongue: English
Weight: 109 KB
Volume: 33
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.1036

No coin nor oath required. For personal study only.

✦ Synopsis

Pseudo-first-order rate constants (k obs ) for alkaline hydrolysis of 4-nitrophthalimide (NPTH) decreased by nearly 8-and 6-fold with the increase in the total concentration of cetyltrimethyl-ammonium bromide ([CTABr] T ) from 0 to 0.02 M at 0.01 and 0.05 M NaOH, respectively. These observations are explained in terms of the pseudophase model and pseudophase ion-exchange model of micelle. The increase in the contents of CH 3 CN from 1 to 70% v/v and CH 3 OH from 0 to 80% v/v in mixed aqueous solvents decreases k obs by nearly 12-and 11-fold, respectively. The values of k obs increase by nearly 27% with the increase in the ionic strength from 0.03 to 3.0 M. The mechanism of alkaline hydrolysis of NPTH involves the reactions between HO Ϫ and nonionized NPTH as well as between HO Ϫ and ionized NPTH. The micellar inhibition of the rate of alkaline hydrolysis of NPTH is attributed to medium polarity effect.

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