Polystyrene-supported chloroaluminate ionic liquid as a new heterogeneous Lewis acid catalyst for Knoevenagel condensation

Boroujeni, Kaveh Parvanak; Jafarinasab, Mina

doi:10.1016/j.cclet.2012.06.019

Cited by 23 publications

(4 citation statements)

References 24 publications

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“…Imidazolium or pyridinium cations were obtained by the alkylation of 1-methylimidazole (Scheme 7) [32,33] or pyridine [34] with a Merrifield resin and then were converted to the acidic catalysts by a subsequent reaction with AlCl 3 [32,34] or FeCl 3 [33].…”

Section: Preparation and Characterization Of Supported Acidic Ionimentioning

confidence: 99%

“…These catalysts were found to be stable to air and moisture retaining their activity for more than a year [32]. This stability was attributed to the hydrophobic nature of polystyrene that was able to protect the water-sensitive Lewis acid from hydrolysis by atmospheric moisture [34].…”

Section: Preparation and Characterization Of Supported Acidic Ionimentioning

confidence: 99%

“…The formation of the covalent bonds was supported by FT-IR spectra of the functionalised resin that showed the appearance of new peaks at 575, 500, 430 cm −1 in chloroaluminate SIPLs, assigned to Al–Cl stretching modes of the Al 2 Cl 7 − anion [32]. In case of the chloroferrate IL, the disappearance of the bands at 1263 and 671 cm −1 of the CH 2 Cl, together with the presence of four typical peaks of the imidazolium cation (1606, 1566, 1154, and 1085 cm −1 ), proved that alkylation was carried out successfully [33].…”

Section: Preparation and Characterization Of Supported Acidic Ionimentioning

confidence: 99%

“…Polystyrene supported [C 1 Him]Cl/AlCl 3 catalysed the Knoevenagel condensation of aromatic and aliphatic aldehydes with ethyl cyanoacetate efficiently [32]. The products were obtained at room temperature in ethanol in good yields (92%–97%, in 0.5–1.4 h).…”

Section: Catalytic Reactions In the Presence Of Acidic Silpsmentioning

confidence: 99%

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The Use of Supported Acidic Ionic Liquids in Organic Synthesis

Skoda‐Földes

2014

Molecules

117

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Abstract:Catalysts obtained by the immobilisation of acidic ionic liquids (ILs) on solid supports offer several advantages compared to the use of catalytically active ILs themselves. Immobilisation may result in an increase in the number of accessible active sites of the catalyst and a reduction of the amount of the IL required. The ionic liquid films on the carrier surfaces provide a homogeneous environment for catalytic reactions but the catalyst appears macroscopically as a dry solid, so it can simply be separated from the reaction mixture. As another advantage, it can easily be applied in a continuous fixed bed reactor. In the present review the main synthetic strategies towards the preparation of supported Lewis acidic and Brønsted acidic ILs are summarised. The most important characterisation methods and structural features of the supported ionic liquids are presented. Their efficiency in catalytic reactions is discussed with special emphasis on their recyclability.

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Section: Preparation and Characterization Of Supported Acidic Ionimentioning

confidence: 99%

Section: Preparation and Characterization Of Supported Acidic Ionimentioning

confidence: 99%

Section: Preparation and Characterization Of Supported Acidic Ionimentioning

confidence: 99%

Section: Catalytic Reactions In the Presence Of Acidic Silpsmentioning

confidence: 99%

See 2 more Smart Citations

The Use of Supported Acidic Ionic Liquids in Organic Synthesis

Skoda‐Földes

2014

Molecules

117

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Exploring the Potential of Supported Ionic Liquids as Building Block Systems in Catalysis

Kaur

Chopra

2020

ChemistrySelect

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Supported ionic liquid catalysts have gained significant attention in recent years to overcome the limitations of the homogeneous and heterogeneous catalysis. The thin film containing dispersed homogeneous catalyst in the ionic liquid have been immobilized onto various porous solid supports having a high surface area to synthesize supported ionic liquids (SILs) that acted as potential organocatalysts in organic green synthesis. Support materials, ionic liquids, and molecularly dispersed catalysts have played a significant role in increasing the catalytic activity of the SIL catalysts. In the present review, the literature of the last decade concerning the synthesis of SIL catalysts by using different strategies as well as their applications in organic synthesis is incorporated. The main emphasis of the present work is to critically analyze the recent developments in the supported molecular dispersed catalysts (such as lewis acids, organometallic complexes, metal nanoparticles, and chemical functionality associated with cation/ anion of ionic liquids) using ILs and explore their potential to act as building block systems in catalysis.

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