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Related Concept Videos

Crown Ethers02:36

Crown Ethers

Crown ethers are cyclic polyethers that contain multiple oxygen atoms, usually arranged in a regular pattern. The first crown ether was synthesized by Charles Pederson while working at DuPont in 1967. For this work, Pedersen was co-awarded the 1987 Nobel Prize in Chemistry. Crown ethers are named using the formula x-crown-y, where x is the total number of atoms in the ring and y is the number of ether oxygen atoms. The term 'crown' refers to the crown-like shape that these ether molecules take.
π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0, resulting in...

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DNA-magnetic Particle Binding Analysis by Dynamic and Electrophoretic Light Scattering
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Magnetic nanoparticle-supported crown ethers.

Masato Kawamura1, Kazuhiko Sato

  • 1National Institute of Advanced Industrial Science and Technology, Central 5 Higashi 1-1-1, Tsukuba, Ibaraki, Japan.

Chemical Communications (Cambridge, England)
|November 21, 2007
PubMed
Summary

New magnetic nanoparticle (MNP)-supported crown ether catalysts efficiently drive phase-transfer reactions. These reusable catalysts offer easy magnetic separation, matching traditional catalyst performance without loss of efficacy.

Area of Science:

  • Catalysis
  • Materials Science
  • Organic Chemistry

Background:

  • Crown ethers are effective phase-transfer catalysts.
  • Separation and reuse of homogeneous catalysts can be challenging.
  • Developing recyclable catalytic systems is crucial for sustainable chemistry.

Purpose of the Study:

  • To synthesize and evaluate magnetic nanoparticle (MNP)-supported crown ethers as recyclable phase-transfer catalysts.
  • To compare the catalytic activity of MNP-supported crown ethers with their non-supported counterparts.
  • To demonstrate the ease of separation and reusability of the MNP-supported catalysts.

Main Methods:

  • Preparation of magnetic nanoparticle-supported crown ethers.
  • Evaluation of catalytic activity in solid-liquid phase-transfer reactions.

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  • Magnetic separation and assessment of catalyst reusability and efficiency.

    • Main Results:

    • Successful synthesis of MNP-supported crown ether catalysts.
    • Catalytic activity comparable to non-supported crown ethers.
    • Efficient catalyst recovery using an external magnet.
    • High catalytic efficiency maintained over multiple reaction cycles.

    Conclusions:

    • MNP-supported crown ethers are effective and recyclable catalysts for phase-transfer reactions.
    • Magnetic separation provides a simple and efficient method for catalyst recovery.
    • This approach offers a sustainable alternative to traditional phase-transfer catalysts.