𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Effects of Nonionic and Mixed Cationic–Nonionic Micelles on the Rate of Alkaline Hydrolysis of 4-Nitrophthalimide

✍ Scribed by M.Niyaz Khan; Emran Ismail

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
70 KB
Volume
240
Category
Article
ISSN
0021-9797

No coin nor oath required. For personal study only.

✦ Synopsis

Pseudo

-first-order rate constants (k obs ) for alkaline hydrolysis of 4-nitrophthalimide show a monotonic decrease with increase in [C 12 E 23 ] T (total concentration of Brij 35) at constant [CH 3 CN] and [NaOH]. This micellar effect is explained in terms of a pseudophase micelle model. The rate of hydrolysis becomes too slow to monitor at [C 12 E 23 ] T ≥ 0.03 M in the absence of cetyltrimethylammonium bromide (CTABr) and at [C 12 E 23 ] T ≥ 0.04 M in the presence of 0.006-0.02 M CTABr at 0.01 M NaOH. The plots of k obs versus [C 12 E 23 ] T show minima at 0.006 and 0.01 M CTABr, while such a minimum is not visible at 0.02 M CTABr.

📜 SIMILAR VOLUMES

Effects of Nonionic, Cationic, and Mixed
Effects of Nonionic, Cationic, and Mixed Nonionic–Cationic Surfactants on the Acid–Base Behavior of Phenyl Salicylate
✍ M.Niyaz Khan; Z. Arifin; M.Rapandy Yusoff; Emran Ismail 📂 Article 📅 1999 🏛 Elsevier Science 🌐 English ⚖ 52 KB

The effects of Brij 35 micelles, CTABr micelles, and mixed Brij 35-CTABr micelles on the acid-base behavior of phenyl salicylate (PST) have been studied in aqueous solution containing 2% v/v acetonitrile. The apparent pK(b) (pK(app)(b)) of PST is decreased by 1.5 pK units with the increase in [Brij

Kinetics and mechanism of alkaline hydro
Kinetics and mechanism of alkaline hydrolysis of 4-nitrophthalimide in the absence and presence of cationic micelles
✍ M. Niyaz Khan; Zunoliza Abdullah 📂 Article 📅 2001 🏛 John Wiley and Sons 🌐 English ⚖ 109 KB 👁 1 views

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

Effects of Mixed Anionic and Cationic Su
Effects of Mixed Anionic and Cationic Surfactants on Rate of Transesterification and Hydrolysis of Esters
✍ Mohammad Niyaz Khan 📂 Article 📅 1996 🏛 Elsevier Science 🌐 English ⚖ 81 KB

NOTE Effects of Mixed Anionic and Cationic Surfactants on Rate of Transesterification and Hydrolysis of Esters appearance of the product, phenolate ion, at 290 nm. The observed data (absorbance, A obs , versus time, t) were found to obey pseudo-first-order The effects of mixed sodium dodecyl sulfate

Micellar medium effects on the hydrolysi
Micellar medium effects on the hydrolysis of phenyl chloroformate in ionic, zwitterionic, nonionic, and mixed micellar solutions
✍ María Muñoz; Amalia Rodríguez; María Del Mar Graciani; María Luisa Moyá 📂 Article 📅 2002 🏛 John Wiley and Sons 🌐 English ⚖ 139 KB 👁 1 views

## Abstract The spontaneous hydrolysis of phenyl chloroformate was studied in various anionic, nonionic, zwitterionic, and cationic aqueous micellar solutions, as well as in mixed anionic–nonionic micellar solutions. In all cases, an increase in the surfactant concentration results in a decrease in

Effects of Nonionic Micelles on the Rate
Effects of Nonionic Micelles on the Rate of Mononuclear Heterocyclic Rearrangement of (Z)-Phenylhydrazones of 5-Substituted 3-Benzoyl-1,2,4-oxadiazoles
✍ Susanna Guernelli; Renato Noto; Carmelo Sbriziolo; Domenico Spinelli; Maria Liri 📂 Article 📅 2001 🏛 Elsevier Science 🌐 English ⚖ 65 KB

Nonionic Triton X-100 micelles solubilize the otherwise waterinsoluble (Z)-phenylhydrazones of some 5-substituted 3-benzoyl-1,2,4-oxadiazoles to an extent suitable for studying the occurrence of a general-base-catalyzed rearrangement in the presence of borate buffers (pH 9.6). The kinetic data, obta

Effect of liposomes on the rate of alkal
Effect of liposomes on the rate of alkaline hydrolysis of indomethacin and acemetacin
✍ C. Matos; H. Chaimovich; J.L.F.C. Lima; I.M. Cuccovia; S. Reis 📂 Article 📅 2001 🏛 John Wiley and Sons 🌐 English ⚖ 266 KB 👁 2 views

The anti-inflammatory, analgesic, and antipyretic drugs indomethacin (INDO) and acemetacin (ACE), extensively used for the treatment of diseases of degenerative or inflammatory character, exhibit marked gastric irritant action, have low water solubility at neutral pH, and decompose in alkali. Altern