Kinetics of the acid hydrolysis of isoproturon in the absence and presence of sodium lauryl sulfate micelles

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

doi:10.1007/s00396-006-1596-2

Cited by 8 publications

(4 citation statements)

References 14 publications

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“…These observations indicate that the same mechanism is being followed in both aqueous medium and micellar medium. The increased rate of reaction in the presence of CTAB and SDS may be explained on the basis of pseudophase model of micelles in which reactions are considered to occur both in aqueous and micellar pseudophases with varying rate constants [18][19][20][21][22]. Scheme 2 has been proposed for reactions occurring in aqueous and micellar media as follows.…”

Section: Barrett and Mcbridementioning

confidence: 99%

Kinetics of Reduction of Colloidal MnO₂ by Glyphosate in Aqueous and Micellar Media

Aisha

Qamruzzaman

Rafiquee

2011

International Journal of Inorganic Chemistry

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The kinetics of the reduction of colloidal MnO2 by glyphosate has been investigated spectrophotometrically in an aqueous and micellar (cetyltrimethylammonium bromide, sodium lauryl sulfate) media. The reaction follows first-order kinetics with respect to colloidal MnO2 in both the aqueous and micellar media. The rate of oxidation increases with increase in [glyphosate] in the lower concentration range but becomes independent at its higher concentrations. The addition of both the anionic (NaLS) and cationic (CTAB) micelles increased the rate of reduction of colloidal MnO2 by glyphosate while the nonionic TX-100 micelles did not influence the rate of reaction. In both aqueous and micellar media, the oxidation of glyphosate occurs through its adsorption over colloidal MnO2 surface. The reaction in micellar media was treated by considering the pseudophase model. The values of reaction rates and binding constants in the presence of micelles were determined.

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Section: Barrett and Mcbridementioning

confidence: 99%

Kinetics of Reduction of Colloidal MnO₂ by Glyphosate in Aqueous and Micellar Media

Aisha

Qamruzzaman

Rafiquee

2011

International Journal of Inorganic Chemistry

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“…Gangwar and Rafiquee studied acid hydrolysis of a urea function in isoproturon in the presence of anionic micelles. 54 The results, treated using the pseudophase model, suggested that the reaction is catalysed by micelles. The likely explanation is that the binding of anionic surfactants to the positively charged urea intermediate lowers its energy thus facilitating hydrolysis.…”

Section: Interface Effectmentioning

confidence: 99%

Reactivity in organised assemblies

Chechik

2008

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

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“…The mechanisms of hydrolysis of phenylureas, carboxylic acid, esters, and amide have been subject of investigation by many workers [3][4][5][6][7][8][9][10][11][12]. The hydrolysis of phenylureas pesticides proceeds through an addition-elimination mechanism in both acidic and basic media.…”

Section: Introductionmentioning

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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Kinetics of the acid hydrolysis of isoproturon in the absence and presence of sodium lauryl sulfate micelles

Cited by 8 publications

References 14 publications

Kinetics of Reduction of Colloidal MnO₂ by Glyphosate in Aqueous and Micellar Media

Kinetics of Reduction of Colloidal MnO₂ by Glyphosate in Aqueous and Micellar Media

Reactivity in organised assemblies

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

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Kinetics of the acid hydrolysis of isoproturon in the absence and presence of sodium lauryl sulfate micelles

Cited by 8 publications

References 14 publications

Kinetics of Reduction of Colloidal MnO2 by Glyphosate in Aqueous and Micellar Media

Kinetics of Reduction of Colloidal MnO2 by Glyphosate in Aqueous and Micellar Media

Reactivity in organised assemblies

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

Contact Info

Product

Resources

About

Kinetics of Reduction of Colloidal MnO₂ by Glyphosate in Aqueous and Micellar Media

Kinetics of Reduction of Colloidal MnO₂ by Glyphosate in Aqueous and Micellar Media