Kinetics of the alkaline hydrolysis of isoproturon in CTAB and NaLS micelles

Gangwar, S. K.; Rafiquee, M.Z.A.

doi:10.1002/kin.20213

Cited by 12 publications

(6 citation statements)

References 15 publications

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“…− is given by the following quadratic equation: where β is the fraction of neutralized micellar surface and its value for CTAB is 0.80 [11,29]. The reactants exist in dynamic equilibrium between the aqueous and micellar pseudophases.…”

Section: Methodsmentioning

confidence: 99%

Kinetics of the alkaline hydrolysis of fenuron in aqueous and micellar media

Gangwar

Rafiquee

2007

Int J of Chemical Kinetics

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The kinetics of the hydrolysis of fenuron in sodium hydroxide has been investigated spectrometrically in an aqueous medium and in cationic micelles of cetyltrimethylammonium bromide (CTAB) medium. The reaction follows first-order kinetics with respect to [fenuron] in both the aqueous and micellar media. The rate of hydrolysis increases with the increase in [NaOH] in the lower concentration range but shows a leveling behavior at higher concentrations. The reaction followed the rate equation, 1/k obs = 1/k, where k obs is the observed rate constant, k is rate constant in aqueous medium, and K is the equilibrium constant for the formation of hydroxide addition product. The cationic CTAB micelles enhanced the rate of hydrolytic reaction. In both aqueous and micellar pseudophases, the hydrolysis of fenuron presumably occurs via an addition-elimination mechanism in which an intermediate hydroxide addition complex is formed. The added salts decrease the rate of reaction. C 2007

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Section: Methodsmentioning

confidence: 99%

Kinetics of the alkaline hydrolysis of fenuron in aqueous and micellar media

Gangwar

Rafiquee

2007

Int J of Chemical Kinetics

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“…surfactants first increase and then decrease with increase in surfactant concentration [61][62][63][64][65][66][67][68] and the catalytic effect of cationic surfactants increases with the increase of their chain length [61,66,68]. Also, the reaction rate decreases in the presence of anionic surfactants [63,65,67,69] and decreases with increase in the surfactant chain length [70]. In the former case, the formation of positively charged cationic surfactant/substrate complex promotes the reaction rate and then the interaction of more cationic surfactant molecules (having hydrophobic chains) with substrate decreases its interaction with negatively charged hydroxide ions.…”

Section: Isomerization Ligand Exchange and Radical Reactionsmentioning

confidence: 99%

Effects of Surfactants on the Rate of Chemical Reactions

Samiey

Cheng

2014

Journal of Chemistry

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Surfactants are self-assembled compounds that depend on their structure and electric charge can interact as monomer or micelle with other compounds (substrates). These interactions which may catalyze or inhibit the reaction rates are studied with pseudophase, cooperativity, and stoichiometric (classical) models. In this review, we discuss applying these models to study surfactant-substrate interactions and their effects on Diels-Alder, redox, photochemical, decomposition, enzymatic, isomerization, ligand exchange, radical, and nucleophilic reactions.

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“…Base-catalysed hydrolysis of a urea derivative (isoproturon) was studied in the presence of anionic and cationic surfactants by Rafiquee et al 48 The reaction was accelerated by cationic micelles and slowed down in the presence of anionic ones, presumably due to binding of hydroxide anion at the surface of positively charged headgroups of the cationic surfactant. At high pH, the reaction showed zeroth order with respect to hydroxide concentration.…”

Section: B Catalytic Reactions In Organised Assembliesmentioning

confidence: 99%

Reactivity in organised assemblies

Chechik

2007

Annu. Rep. Prog. Chem., Sect. B: Org. Chem.

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This article discusses recent publications on chemical reactivity in large organic structures, including supramolecular systems (e.g., host-guest complexes), dendrimers, colloids (e.g., micelles, vesicles, microemulsions), nanoparticles and thin films. Although these systems are very different structurally, the main factors affecting organic reactivity in these assemblies are similar. These effects are: (i) proximity of functional groups in organised assemblies that may facilitate reactions between them (''proximity effect''); (ii) partitioning of the reagents between the bulk solvent and the organised assembly, which determines the local concentration of reagents in the vicinity of the functional group (''solvent effect''); (iii) unique properties of the interface between the organic assembly and the bulk solution (''interface effect''); (iv) restricted and/or anisotropic mobility of organic molecules in the organised assembly (''steric effect''). This article aims to describe each effect using examples from different types of organic assemblies. The review covers literature published in 2006 and early 2007.

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Kinetics of the alkaline hydrolysis of isoproturon in CTAB and NaLS micelles

Cited by 12 publications

References 15 publications

Kinetics of the alkaline hydrolysis of fenuron in aqueous and micellar media

Kinetics of the alkaline hydrolysis of fenuron in aqueous and micellar media

Effects of Surfactants on the Rate of Chemical Reactions

Reactivity in organised assemblies

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