Mesoporous molecular sieves as advanced supports for olefin metathesis catalysts

Balcar, Hynek; Čejka, Jiřı́

doi:10.1016/j.ccr.2013.07.026

Cited by 77 publications

(47 citation statements)

References 136 publications

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“…[2c] To increaset he activity of immobilised catalysts, supports with large surfacea reas, big pores, narrow pore size distribution and easy synthesis is required. For this purpose, the immobilisation on mesoporous molecular sieves has been reviewed recently [3] and the use of metal-organic frameworks as substrates has been achieveda sw ell. [4] Next to immobilisationo ft he catalyst, catalyst separation might be achieved by other means.A ne xample is the combination of fluorine chemistry with metathesis, where the use of fluorinated ligands might aid in catalystseparation.…”

Section: Cross Metathesis In Biobased Chemistrymentioning

confidence: 99%

The Future of Ethenolysis in Biobased Chemistry

et al. 2016

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The desire to utilise biobased feedstocks and develop more sustainable chemistry poses new challenges in catalysis. A synthetically useful catalytic conversion is ethenolysis, a cross metathesis reaction with ethylene. In this Review, the state of the art of ethenolysis in biobased chemistry was extensively examined using methyl oleate as a model compound for fatty acids. Allied to this, the ethenolysis of fatty acid, polymers and more challenging substrates are reviewed. To determine the limiting factors for the application of ethenolysis on biomass, the influence of reaction parameters were investigated and the bottlenecks for reaching high turnover numbers identified.

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Section: Cross Metathesis In Biobased Chemistrymentioning

confidence: 99%

The Future of Ethenolysis in Biobased Chemistry

et al. 2016

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“…Robert H. Grubbs immobilized Hoveyda Grubbs catalysts on silica gel for a number of metathesis reactions . There are also some reports about using new kinds of supports, such as magnetic nanoparticle, mesoporous molecular silicas and aluminas, to immobilize Grubbs catalysts for metathesis . These results showed that the heterogeneous catalysts were recycled conveniently over a number of reaction cycles.…”

Section: Methodsmentioning

confidence: 99%

Grubbs Catalysts Immobilized on Merrifield Resin for Metathesis of Leaf Alcohols by using a Convenient Recycling Approach

Xia

Peng²,

Wang³

et al. 2019

ChemistryOpen

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Three new types of heterogeneous catalysts were prepared using a facile approach by the immobilization of Grubbs catalysts on PEGylated Merrifield resin. One of the immobilized catalysts was more efficient than the free catalyst for the metathesis of leaf alcohols in conversion and selectivity and was reused repeatedly (up to 5 cycles) with only a slight loss of activity (10.5 %). The long‐chain PEGylated linker provided an appropriate distance between the resin and the catalytic center so that the ruthenium catalysts acted as the free catalyst.

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“…Grubbs type/Hoveyda-Grubbs type catalysts: (a, b) 1 st generation, (c-e) 2 nd generation. [22,[45][46][47] Figure 3. Interactions (covalent, non-covalent/weak hydrogen-bonding, etc.)…”

Section: Supported Versions Of Conventional Catalystsmentioning

confidence: 99%

Heterogeneous olefin‐metathesis: Comparative perspective of the activity with respect to unsaturated fatty acid methyl esters

2017

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Olefin metathesis is one of the most exiting tools in synthetic chemistry that can explicitly be employed to produce higher value products from unsaturated fats and oil feedstock. Contrary to the early stage metathesis catalysts, being extremely sensitive to humidity and to the substrate functionalities, redesigned organometallic species not only exhibit greater activity and selectivity but also offer pronounced stability towards functional olefins and ambient atmosphere. Though a number of highly efficient homogeneous catalysts have been developed, these are generally costly and also lead to product contamination and, consequently, pose environmental concerns. Heterogeneous catalysis can be an alternate route; however it faces a number of hurdles such as support compatibility, multiple active sites, and abridged efficacy. Nevertheless, through careful designing, certain heterogeneous catalyst systems have been suggested for metathesis of functionalized olefins like fatty acid methyl esters (FAMEs). A number of metallic species such as organometallic compounds bearing metal‐alkylidene moieties (e.g. Grubbs‐/Schrock‐type systems), alkylidene‐free complexes (e.g. methyltrioxorhenium), and inorganic (W, Mo, Re) oxides/chlorides have been probed in this regard. Accordingly this mini review deals with the various aspects like heterogenization/immobilization, activity criteria, and reusability of such catalyst systems in the context of olefin metathesis of natural fats/oils derivatives.

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Mesoporous molecular sieves as advanced supports for olefin metathesis catalysts

Cited by 77 publications

References 136 publications

The Future of Ethenolysis in Biobased Chemistry

The Future of Ethenolysis in Biobased Chemistry

Grubbs Catalysts Immobilized on Merrifield Resin for Metathesis of Leaf Alcohols by using a Convenient Recycling Approach

Heterogeneous olefin‐metathesis: Comparative perspective of the activity with respect to unsaturated fatty acid methyl esters

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