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Updated: May 31, 2026

Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction
Published on: August 23, 2018
High-turnover supramolecular catalysis by a protected ruthenium(II) complex in aqueous solution
Casey J Brown1, Gregory M Miller, Miles W Johnson
1Chemical Sciences Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, USA.
A novel supramolecular catalyst using a ruthenium(II) complex within a water-soluble assembly enables high-turnover allyl alcohol isomerization. This host-guest system protects the catalyst while maintaining high activity, achieving over 1000 turnovers.
Area of Science:
- Supramolecular Chemistry
- Catalysis
- Organometallic Chemistry
Background:
- Designing stable and highly active catalysts is crucial for efficient chemical transformations.
- Supramolecular assemblies offer unique environments for controlling catalyst behavior.
- Ruthenium(II) complexes are known for their catalytic potential but can be prone to decomposition.
Purpose of the Study:
- To develop a supramolecular catalyst with enhanced stability and high turnover number.
- To investigate the effect of supramolecular confinement on catalyst activity and scope.
- To demonstrate a water-soluble supramolecular system for catalysis.
Main Methods:
- Incorporation of a ruthenium(II) catalyst into a water-soluble supramolecular host.
- Catalysis of allyl alcohol isomerization using the supramolecular complex.
- Characterization of catalyst stability and activity within the host-guest system.
Main Results:
- The supramolecular catalyst achieved high turnover numbers (>1000 turnovers) for allyl alcohol isomerization.
- Sequestration within the host protected the ruthenium(II) catalyst from decomposition.
- Catalytic activity was retained, with the scope influenced by the host's confinement.
Conclusions:
- A water-soluble supramolecular catalyst based on a ruthenium(II) complex was successfully designed.
- The host-guest complex provides enhanced catalyst stability and high catalytic efficiency.
- Supramolecular encapsulation is an effective strategy for developing robust and active catalysts.
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