Kinetics and mechanism of the oxidation of vanillic acid using smectite clay

Frikha, Nourzed; Bouguerra, Soumaya; Ammar, Sourour; Medina, Francisco; Abdelhédi, Ridha; Bouaziz, Mohamed

doi:10.1007/s11144-019-01668-9

“…This result could be ascribed to the fact that the high concentration of the active Fe 2+ species and the lowest rate of H 2 O 2 parasitic decomposition increase the precipitation of the insoluble ferric hydroxides. 30 …”

Section: Resultsmentioning

confidence: 99%

“…This result could be ascribed to the fact that the high concentration of the active Fe 2+ species and the lowest rate of H 2 O 2 parasitic decomposition increase the precipitation of the insoluble ferric hydroxides. 30 The Hydroxytyrol concentrations obtained under different experimental conditions are summarized in Table 1. The optimum conditions, giving a higher concentration of Hyd, were as follows: Tyr concentration 10 À1 M, the hydrogen peroxide concentration 7 Â 10 À2 M and 0.2 g L À1 of KSF.…”

Section: Inuence Of Operating Parameters On Hydroxytyrosol Productionmentioning

confidence: 99%

Production of biologically active hydroxytyrosol rich extract via catalytic conversion of tyrosol

Neji

¹

,

Bouaziz

²

2022

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“…reported a novel oxidative ODM for phenolic aryl methyl ethers over stabilized 2‐iodoxybenzoic acid (SIBX) in THF at room temperature, followed by a reductive treatment with Na 2 S 2 O 4 to avoid degradation of the reactive ortho‐ quinone product, by which 89 % yield of 4‐propylcatechol was obtained (Entry 49, Table 1). [124] The solid acid montmorillonite KSF in combination with H 2 O 2 could afford excellent protocatechuic acid yield (75 %) from vanillic acid via an oxidative ODM [125] . Additionally, the voltage‐bias‐assisted electrochemical ODM (with intermediate oxidation and reduction) of guaiacol into catechol over a multiwalled carbon nanotube (MWCNT) surface in neutral phosphate buffer solution has been reported [126] …”

Section: Odm Of Ortho‐methoxyphenolsmentioning

confidence: 99%

“…[122] excellent protocatechuic acid yield (75 %) from vanillic acid via an oxidative ODM. [125] Additionally, the voltage-biasassisted electrochemical ODM (with intermediate oxidation and reduction) of guaiacol into catechol over a multiwalled carbon nanotube (MWCNT) surface in neutral phosphate buffer solution has been reported. [126]…”

Section: Odm Of Guaiacolsmentioning

confidence: 99%

Advancements and Perspectives toward Lignin Valorization via O‐Demethylation

Wu,

Smet,

Brandi

et al. 2024

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Lignin represents the largest aromatic carbon resource in plants, holding significant promise as a renewable feedstock for bioaromatics and other cyclic hydrocarbons in the context of the circular bioeconomy. However, the methoxy groups of aryl methyl ethers, abundantly found in technical lignins and lignin‐derived chemicals, limit their pertinent chemical reactivity and broader applicability. Unlocking the phenolic hydroxyl functionality through O‐demethylation (ODM) has emerged as a valuable approach to mitigate this need and enables further applications. In this review, we provide a comprehensive summary of the progress in the valorization of technical lignin and lignin‐derived chemicals via ODM, both catalytic and non‐catalytic reactions. Furthermore, a detailed analysis of the properties and potential applications of the O‐demethylated products is presented, accompanied by a systematic overview of available ODM reactions. This review primarily focuses on enhancing the phenolic hydroxyl content in lignin‐derived species through ODM, showcasing its potential in the catalytic funneling of lignin and value‐added applications. A comprehensive synopsis and future outlook are included in the concluding section of this review.

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“…[122] Angewandte Chemie Aufsätze excellent protocatechuic acid yield (75 %) from vanillic acid via an oxidative ODM. [125] Additionally, the voltage-biasassisted electrochemical ODM (with intermediate oxidation and reduction) of guaiacol into catechol over a multiwalled carbon nanotube (MWCNT) surface in neutral phosphate buffer solution has been reported. [126]…”

Section: Aufsätzementioning

confidence: 99%

Advancements and Perspectives toward Lignin Valorization via O‐Demethylation

Wu,

Smet,

Brandi

et al. 2024

Angewandte Chemie

1

0

View full text Add to dashboard Cite

Lignin represents the largest aromatic carbon resource in plants, holding significant promise as a renewable feedstock for bioaromatics and other cyclic hydrocarbons in the context of the circular bioeconomy. However, the methoxy groups of aryl methyl ethers, abundantly found in technical lignins and lignin‐derived chemicals, limit their pertinent chemical reactivity and broader applicability. Unlocking the phenolic hydroxyl functionality through O‐demethylation (ODM) has emerged as a valuable approach to mitigate this need and enables further applications. In this review, we provide a comprehensive summary of the progress in the valorization of technical lignin and lignin‐derived chemicals via ODM, both catalytic and non‐catalytic reactions. Furthermore, a detailed analysis of the properties and potential applications of the O‐demethylated products is presented, accompanied by a systematic overview of available ODM reactions. This review primarily focuses on enhancing the phenolic hydroxyl content in lignin‐derived species through ODM, showcasing its potential in the catalytic funneling of lignin and value‐added applications. A comprehensive synopsis and future outlook are included in the concluding section of this review.

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Kinetics and mechanism of the oxidation of vanillic acid using smectite clay

Cited by 5 publications

References 27 publications

Production of biologically active hydroxytyrosol rich extract via catalytic conversion of tyrosol

Production of biologically active hydroxytyrosol rich extract via catalytic conversion of tyrosol

Advancements and Perspectives toward Lignin Valorization via O‐Demethylation

Advancements and Perspectives toward Lignin Valorization via O‐Demethylation

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