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2000
Volume 12, Issue 2
  • ISSN: 2213-3372
  • E-ISSN: 2213-3380

Abstract

Introduction

A novel immobilized imidazolium type ionic liquid was synthesized using poly(ethylene glycol) (PEG) functionalized magnetic multi-walled carbon nanotubes. This immobilized ionic liquid (MMWCNTs-PEG-IL) was characterized by FT-IR, VSM, XRD, FE-SEM and EDX analysis.

Methods

Then, it was used as a magnetic catalyst in a three-component reaction to yield tetrahydrobenzo[b]pyran derivatives. First, optimized reaction conditions were investigated. A mixture of containing dimedone (1 mmol), malononitrile (1 mmol), benzaldehyde (1.2 mmol) and MMWCNTs-PEG-IL (0.03 g) in HO/EtOH (5 mL) was stirred at 70°C. After completion of the reaction, the mixture was cooled.

Results

Then, an external magnet was used to separate the magnetic catalyst. This method has many advantages including high reaction yields, high TOFs, using non-toxic solvents, easy handling of catalyst, simple separation of catalyst from reaction medium and short reaction times.

Conclusion

Also, the reusability of the magnetic catalyst has been investigated in 7 runs without serious loss of reaction yield.

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2024-09-13
2025-10-28

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Three-component Synthesis of Tetrahydrobenzo[b]pyrans Using MMWCNTs-PEG-IL as a Novel Magnetic Immobilized Ionic Liquid
Curr. Organocatal. 12, 83 (2025); https://doi.org/10.2174/0122133372334852240909074945
/content/journals/cocat/10.2174/0122133372334852240909074945
/content/journals/cocat/10.2174/0122133372334852240909074945
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  • Article Type:     Research Article
Keyword(s): carbon nanotube; heterocyclic compound; immobilized ionic liquids; magnetic catalyst; multi-component reaction; Tetrahydrobenzo [b] pyrans

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