Silica-immobilized ionic liquid Brønsted acids as highly effective heterogeneous catalysts for the isomerization of <i>n</i>-heptane and <i>n</i>-octane

Dhar, Abhishek; Kumar, Nadavala Siva; Khimani, Mehul; Al‐Fatesh, Ahmed S.; Ibrahim, Ahmed A.; Fakeeha, Anis H.; Patel, Hiren K.; Vekariya, Rohit L.

doi:10.1039/d0ra00556h

Cited by 16 publications

(7 citation statements)

References 45 publications

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“…These results showed that the three ILs were successfully prepared. 29,32,33 As shown in and $6% weight loss was found, which was mainly due to the evaporation of water. In the second stage from 82 C to 153 C, no signicant weight loss (<1%) was found.…”

Section: Il Characteristicsmentioning

confidence: 80%

Lipophilic antioxidant dodecyl caffeate preparation by the esterification of caffeic acid with dodecanol using ionic liquid [Hnmp]HSO₄ as a catalyst

et al. 2022

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Section: Il Characteristicsmentioning

confidence: 80%

Lipophilic antioxidant dodecyl caffeate preparation by the esterification of caffeic acid with dodecanol using ionic liquid [Hnmp]HSO₄ as a catalyst

et al. 2022

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“…In this regard, ILs have been anchored to the external surfaces and cavities of several porous solid material to place a thin layer of IL in order to make them more costeffective, easily recoverable, quicker diffusion and mass transfer. Up to now, silica [9,10], clays [11], organic polymers [12], zeolites [13] and metal oxides [14] are commonly used supports for the immobilization of ILs.…”

Section: Introductionmentioning

confidence: 99%

Non-covalent immobilized sultone based protic ionic liquids on nano silica sulfuric acid as novel heterogeneous catalysts for the efficient synthesis of tetrazolopyrimidines

Taib

Keshavarz

2022

J Porous Mater

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In this research work, a novel strategy for the heterogenization of sultone based acidic ionic liquids via their non-covalent immobilization on nano silica sulfuric acid is reported and the catalytic ability of the prepared heterogeneous catalysts for the synthesis of tetrazolopyrimidines derivatives is investigated.The physicochemical properties of the prepared catalysts were studied using thermal and spectroscopic techniques such as 1 H and 13 C NMR, FTIR, SEM, TEM, TGA, EDX and BET. In the following, tetrazolopyrimidine derivatives were synthesized in the presence of the prepared heterogeneous supported acidic ionic liquids on nano silica sulfuric acid in a three-component reaction of aromatic aldehydes, 5-aminotetrazole and active methylene compounds. The obtained results showed that the supported protic ionic liquids have better catalytic activity than their non-supported forms. Moreover, the recoverability, reusability and thermal stability of the acidic ionic liquids were also signi cantly improved by immobilization on nano silica sulfuric acid.

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“…However, the isolation of pure ILs from products and reusability has been the major issue in these processes in view of eco-sustainability. Therefore, the immobilization of these functionalized ILs over different solid supports to explore heterogeneous supported ILs has made the process easier through their easy handling, thermal stability, facile isolation and reusability [28][29][30][31][32][33]. Among these soild supports, mesoporous silica materials offer significant advantages of large surface area, highly ordered structure, thermal and chemical stabilities.…”

Section: Introductionmentioning

confidence: 99%

Novel and Reusable Mesoporous Silica Supported 4-Methylbenzenesul- fonate-functionalized Ionic Liquids for Room Temperature Highly Efficient Preparation of 2,4,5-Triaryl-1H-imidazoles

Liu

Chen

et al. 2021

J. Mex. Chem. Soc.

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Abstract. A series of mesoporous materials supported ionic liquids were prepared and tested as effective and practical catalysts for the synthesis of 2,4,5-triaryl-1H-imidazoles. The effects of type of catalysts, catalyst amount, and catalyst stability have also been investigated in detail, the catalyst Ti-SBA-15@ILTsO exhibited excellent activity in excellent yields of 92 % ~ 99 % with low catalyst amount at room temperature within 1 h. In addition, the supported ionic liquid can be easily recovered and reused for six times with satisfactory catalytic activity. Furthermore, a general synergetic catalytic mechanism for the reaction was proposed. Maybe this work employing Ti-SBA-15@ILTsO as highly efficient and stable catalyst for the synthesis of 2,4,5-triaryl-1H-imidazoles has potential commercial applications. Resumen. Se prepararon y probaron una serie de materiales mesoporosos soportados con líquidos iónicos como catalizadores eficaces y prácticos para la síntesis de 2,4,5-triaryl-1H-imidazoles. También se investigaron en detalle los efectos del tipo de catalizadores, la cantidad de catalizador y la estabilidad del catalizador. El catalizador Ti-SBA-15@ILTsO mostró una excelente actividad con rendimientos excelentes del 92 % ~ 99% con una baja cantidad de catalizador a temperatura ambiente en 1 h. Además, el líquido iónico soportado puede recuperarse fácilmente y reutilizarse durante seis veces con una actividad catalítica satisfactoria. Por otro lado, se propuso un mecanismo catalítico sinérgico general para la reacción. Este trabajo que emplea Ti-SBA-15@ILTsO como catalizador altamente eficiente y estable para la síntesis de 2,4,5-triaril-1H-imidazoles puede tener aplicaciones potencialmente comerciales.

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Silica-immobilized ionic liquid Brønsted acids as highly effective heterogeneous catalysts for the isomerization of n-heptane and n-octane

Abstract: Metal-free imidazolium-based ionic liquid (IL) Brønsted acids 1-methyl imidazolium hydrogen sulphate [HMIM]HSO4 and 1-methyl benzimidazolium hydrogen sulphate [HMBIM]HSO4 were synthesized.

Cited by 16 publications

References 45 publications

Lipophilic antioxidant dodecyl caffeate preparation by the esterification of caffeic acid with dodecanol using ionic liquid [Hnmp]HSO₄ as a catalyst

Lipophilic antioxidant dodecyl caffeate preparation by the esterification of caffeic acid with dodecanol using ionic liquid [Hnmp]HSO₄ as a catalyst

Non-covalent immobilized sultone based protic ionic liquids on nano silica sulfuric acid as novel heterogeneous catalysts for the efficient synthesis of tetrazolopyrimidines

Novel and Reusable Mesoporous Silica Supported 4-Methylbenzenesul- fonate-functionalized Ionic Liquids for Room Temperature Highly Efficient Preparation of 2,4,5-Triaryl-1H-imidazoles

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Silica-immobilized ionic liquid Brønsted acids as highly effective heterogeneous catalysts for the isomerization of n-heptane and n-octane

Abstract: Metal-free imidazolium-based ionic liquid (IL) Brønsted acids 1-methyl imidazolium hydrogen sulphate [HMIM]HSO4 and 1-methyl benzimidazolium hydrogen sulphate [HMBIM]HSO4 were synthesized.

Cited by 16 publications

References 45 publications

Lipophilic antioxidant dodecyl caffeate preparation by the esterification of caffeic acid with dodecanol using ionic liquid [Hnmp]HSO4 as a catalyst

Lipophilic antioxidant dodecyl caffeate preparation by the esterification of caffeic acid with dodecanol using ionic liquid [Hnmp]HSO4 as a catalyst

Non-covalent immobilized sultone based protic ionic liquids on nano silica sulfuric acid as novel heterogeneous catalysts for the efficient synthesis of tetrazolopyrimidines

Novel and Reusable Mesoporous Silica Supported 4-Methylbenzenesul- fonate-functionalized Ionic Liquids for Room Temperature Highly Efficient Preparation of 2,4,5-Triaryl-1H-imidazoles

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Lipophilic antioxidant dodecyl caffeate preparation by the esterification of caffeic acid with dodecanol using ionic liquid [Hnmp]HSO₄ as a catalyst

Lipophilic antioxidant dodecyl caffeate preparation by the esterification of caffeic acid with dodecanol using ionic liquid [Hnmp]HSO₄ as a catalyst