Micellar effect upon the rate of alkaline hydrolysis of carboxylic and carbonate esters

Al‐Shamary, Mona N.; Al‐Lohedan, Hamad A.; Rafiquee, M.Z.A.; El-Ablack, Fawzia Z.; Issa, Zuheir A.

doi:10.1016/j.jscs.2014.01.002

Cited by 13 publications

(5 citation statements)

References 21 publications

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“…The results obtained for k ψ − [SDS‐PVA] plots have been dealt with by using the pseudophase model, in which benzocaine is assumed to be associated with SDS‐PVA aggregates, whereas OH – ions remain largely in the aqueous pseudophase. The following Equation was used to calculate

k_{w}^{'}

k_{p}^{'}

, and K B for the hydrolysis occurring in the presence of SDS‐PVA (Al‐shamary et al, ).

\frac{1}{k_{w}^{'} - k_{ψ}} bold= \frac{1}{k_{w}^{'} - k_{p}^{'}} bold+ \frac{1}{((), k_{w}^{'} - k_{p}^{'}) K_{B} ([], {PD}_{normaln})}

here, [PD n ] represents the concentration of the PVA–surfactant complex. K B is the binding constant of benzocaine with PVA–surfactant complex, and

k_{p}^{'}

denotes the first‐order rate constant for the reaction occurring in the PVA–surfactant complex pseudophase.…”

Section: Resultsmentioning

confidence: 99%

“…The results obtained for k ψ − [SDS-PVA] plots have been dealt with by using the pseudophase model, in which benzocaine is assumed to be associated with SDS-PVA aggregates, whereas OHions remain largely in the aqueous pseudophase. The following Equation (6) was used to calculate k 0 w , k 0 p , and K B for the hydrolysis occurring in the presence of SDS-PVA (Al-shamary et al, 2017).…”

Section: Hydrolysis Of Benzocaine In Pva-surfactant Mixed Systemmentioning

confidence: 99%

See 1 more Smart Citation

Studies on the Hydration Behavior of Polyvinyl Alcohol in Aqueous Solution: A Kinetic Approach through the Hydrolysis of Benzocaine

Rahman

Rafiquee

2019

J Surfact & Detergents

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The present work investigates the structural and dynamical features of Polyvinyl alcohol (PVA) and surfactant–PVA system through the change in the rate of hydrolysis of benzocaine. The UV–Vis spectra of benzocaine showed that the absorbance values at λmax (284 nm) increased with the increase in PVA. The rate of hydrolysis decreased in the dilute‐ and high‐concentration regions of PVA, whereas it remains unchanged in the mid‐concentration range of PVA, known as the polymer–polymer interaction region. These observations correspond to the structural changes in PVA with the increase in PVA concentration in aqueous solution. The aggregation behavior of PVA was further studied using transmission electron microscopy micrographs. The rate constant for the hydrolysis of benzocaine showed peaked behavior with the increase in [CTABr] in the CTABr‐PVA mixed system. The sodium dodecyl sulphate (SDS) molecules modify the PVA chains into a more compact form, and so, the hydration number around PVA is decreased. Consequently, the less hydrophilic benzocaine entangles with SDS‐PVA, whereas OH– ions aggregate into the aqueous pseudophase, resulting in a decrease in the rate of hydrolysis in the SDS–PVA mixed medium. The calculated value of binding constant increased with the increase in PVA in both CTABr‐PVA and SDS‐PVA mixed systems.

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k_{w}^{'}

k_{p}^{'}

, and K B for the hydrolysis occurring in the presence of SDS‐PVA (Al‐shamary et al, ).

\frac{1}{k_{w}^{'} - k_{ψ}} bold= \frac{1}{k_{w}^{'} - k_{p}^{'}} bold+ \frac{1}{((), k_{w}^{'} - k_{p}^{'}) K_{B} ([], {PD}_{normaln})}

here, [PD n ] represents the concentration of the PVA–surfactant complex. K B is the binding constant of benzocaine with PVA–surfactant complex, and

k_{p}^{'}

denotes the first‐order rate constant for the reaction occurring in the PVA–surfactant complex pseudophase.…”

Section: Resultsmentioning

confidence: 99%

Section: Hydrolysis Of Benzocaine In Pva-surfactant Mixed Systemmentioning

confidence: 99%

Studies on the Hydration Behavior of Polyvinyl Alcohol in Aqueous Solution: A Kinetic Approach through the Hydrolysis of Benzocaine

Rahman

Rafiquee

2019

J Surfact & Detergents

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“…It is observed that many stoichiometric reactions are accelerated in micellar solutions for which the term “Micellar Catalysis” has been introduced. Some examples are dye fading [ 92 , 93 ] or ester hydrolysis [ 65 , 94 ]. However, surfactant micelles are not catalysts and are subject to a catalytic cycle.…”

Section: Discussionmentioning

confidence: 99%

Is Micellar Catalysis Green Chemistry?

et al. 2023

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Many years ago, twelve principles were defined for carrying out chemical reactions and processes from a green chemistry perspective. It is everyone’s endeavor to take these points into account as far as possible when developing new processes or improving existing ones. Especially in the field of organic synthesis, a new area of research has thus been established: micellar catalysis. This review article addresses the question of whether micellar catalysis is green chemistry by applying the twelve principles to micellar reaction media. The review shows that many reactions can be transferred from an organic solvent to a micellar medium, but that the surfactant also has a crucial role as a solubilizer. Thus, the reactions can be carried out in a much more environmentally friendly manner and with less risk. Moreover, surfactants are being reformulated in their design, synthesis, and degradation to add extra advantages to micellar catalysis to match all the twelve principles of green chemistry.

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“…The hydrolysis of cellulose is occurred via the cleavage of glycoside bonds in the presence of acids. After the application of coating layer, the weight loss values for both chemical solution were recorded as follows: NaOH > ECE > enzyme [48][49][50]. Considering the overall physicochemical results, due to the highest fibrillation and scouring performance of enzyme treated fabric, the coating layer was adhered best to this sample.…”

Section: Physicochemical Propertiesmentioning

confidence: 99%

Usage of UV-Curable Soybean Oil Based Coating Formulations for Pretreated Cotton Fabrics

Yildiz¹

2022

Tekstil Ve Konfeksiyon

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This study aims to design an alternative way for the laminated fabric manufacturing with a cleaner production method, by using a bio-based coating formulation and time/cost saving, environmentally friendly UV-curing technology, compared to the conventional petroleum based, heat and solvent requiring laminating process. For this purpose, acrylated epoxidized soybean oil oligomer was synthesized and included in coating formulations for the application on cotton fabrics via UV-curing. The obtained oligomer was characterized by FTIR and 1 H NMR spectroscopies. In order to enhance the bonding between the fabric and coating layer, fabrics were pretreated by sodium hydroxide, pectinase enzyme, and a commercial washing agent prior to the coating process. The effects of pretreatment methods on the wettability, tensile and peel strength, and abrasion resistance of the fabrics were all examined before/after coating process. Enzyme pretreatment revealed promising results by increasing the surface roughness, fibrillation, and hydrophilicity of the cotton fabrics. After coating and UV-curing process, the highest increment in tensile strength, the highest peel strength, and the least weight loss value against abrasion were all recorded in enzyme pretreated fabric.

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Micellar effect upon the rate of alkaline hydrolysis of carboxylic and carbonate esters

Cited by 13 publications

References 21 publications

Studies on the Hydration Behavior of Polyvinyl Alcohol in Aqueous Solution: A Kinetic Approach through the Hydrolysis of Benzocaine

Studies on the Hydration Behavior of Polyvinyl Alcohol in Aqueous Solution: A Kinetic Approach through the Hydrolysis of Benzocaine

Is Micellar Catalysis Green Chemistry?

Usage of UV-Curable Soybean Oil Based Coating Formulations for Pretreated Cotton Fabrics

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