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  1. Article ; Online: Amine Adsorbents Stability for Post-Combustion CO

    Leenders, Stefan H A M / Pankratova, Galina / Wijenberg, John / Romanuka, Julija / Gharavi, Farahnaz / Tsou, Joana / Infantino, Melina / van Haandel, Lennart / van Paasen, Sander / Just, Paul-Emmanuel

    ChemSusChem

    2023  Volume 16, Issue 24, Page(s) e202300930

    Abstract: Alternative to current liquid amine technologies for post-combustion ... ...

    Abstract Alternative to current liquid amine technologies for post-combustion CO
    Language English
    Publishing date 2023-09-27
    Publishing country Germany
    Document type Journal Article
    ISSN 1864-564X
    ISSN (online) 1864-564X
    DOI 10.1002/cssc.202300930
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Transition metal catalysis in confined spaces.

    Leenders, Stefan H A M / Gramage-Doria, Rafael / de Bruin, Bas / Reek, Joost N H

    Chemical Society reviews

    2015  Volume 44, Issue 2, Page(s) 433–448

    Abstract: Transition metal catalysis plays an important role in both industry and in academia where selectivity, activity and stability are crucial parameters to control. Next to changing the structure of the ligand, introducing a confined space as a second ... ...

    Abstract Transition metal catalysis plays an important role in both industry and in academia where selectivity, activity and stability are crucial parameters to control. Next to changing the structure of the ligand, introducing a confined space as a second coordination sphere around a metal catalyst has recently been shown to be a viable method to induce new selectivity and activity in transition metal catalysis. In this review we focus on supramolecular strategies to encapsulate transition metal complexes with the aim of controlling the selectivity via the second coordination sphere. As we will discuss, catalyst confinement can result in selective processes that are impossible or difficult to achieve by traditional methods. We will describe the template-ligand approach as well as the host-guest approach to arrive at such supramolecular systems and discuss how the performance of the catalyst is enhanced by confining it in a molecular container.
    MeSH term(s) Catalysis ; Coordination Complexes/chemistry ; Ligands ; Metalloporphyrins/chemistry ; Metals/chemistry ; Molecular Conformation ; Palladium/chemistry ; Stereoisomerism
    Chemical Substances Coordination Complexes ; Ligands ; Metalloporphyrins ; Metals ; Palladium (5TWQ1V240M)
    Language English
    Publishing date 2015-01-21
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 1472875-8
    ISSN 1460-4744 ; 0306-0012
    ISSN (online) 1460-4744
    ISSN 0306-0012
    DOI 10.1039/c4cs00192c
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Self-assembled nanospheres with multiple endohedral binding sites pre-organize catalysts and substrates for highly efficient reactions.

    Wang, Qi-Qiang / Gonell, Sergio / Leenders, Stefan H A M / Dürr, Maximilian / Ivanović-Burmazović, Ivana / Reek, Joost N H

    Nature chemistry

    2016  Volume 8, Issue 3, Page(s) 225–230

    Abstract: Tuning reagent and catalyst concentrations is crucial in the development of efficient catalytic transformations. In enzyme-catalysed reactions the substrate is bound-often by multiple non-covalent interactions-in a well-defined pocket close to the active ...

    Abstract Tuning reagent and catalyst concentrations is crucial in the development of efficient catalytic transformations. In enzyme-catalysed reactions the substrate is bound-often by multiple non-covalent interactions-in a well-defined pocket close to the active site of the enzyme; this pre-organization facilitates highly efficient transformations. Here we report an artificial system that co-encapsulates multiple catalysts and substrates within the confined space defined by an M12L24 nanosphere that contains 24 endohedral guanidinium-binding sites. Cooperative binding means that sulfonate guests are bound much more strongly than carboxylates. This difference has been used to fix gold-based catalysts firmly, with the remaining binding sites left to pre-organize substrates. This strategy was applied to a Au(I)-catalysed cyclization of acetylenic acid to enol lactone in which the pre-organization resulted in much higher reaction rates. We also found that the encapsulated sulfonate-containing Au(I) catalysts did not convert neutral (acid) substrates, and so could have potential in the development of substrate-selective catalysis and base-triggered on/off switching of catalysis.
    MeSH term(s) Binding Sites ; Biochemistry/methods ; Catalysis ; Guanidine/metabolism ; Nanospheres/chemistry ; Nanospheres/metabolism ; Nanospheres/ultrastructure ; Nanotechnology/methods
    Chemical Substances Guanidine (JU58VJ6Y3B)
    Language English
    Publishing date 2016-03
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2464596-5
    ISSN 1755-4349 ; 1755-4330
    ISSN (online) 1755-4349
    ISSN 1755-4330
    DOI 10.1038/nchem.2425
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Selective Co-Encapsulation Inside an M

    Leenders, Stefan H A M / Becker, René / Kumpulainen, Tatu / de Bruin, Bas / Sawada, Tomohisa / Kato, Taito / Fujita, Makoto / Reek, Joost N H

    Chemistry (Weinheim an der Bergstrasse, Germany)

    2016  Volume 22, Issue 43, Page(s) 15468–15474

    Abstract: There is broad interest in molecular encapsulation as such systems can be utilized to stabilize guests, facilitate reactions inside a cavity, or give rise to energy-transfer processes in a confined space. Detailed understanding of encapsulation events is ...

    Abstract There is broad interest in molecular encapsulation as such systems can be utilized to stabilize guests, facilitate reactions inside a cavity, or give rise to energy-transfer processes in a confined space. Detailed understanding of encapsulation events is required to facilitate functional molecular encapsulation. In this contribution, it is demonstrated that Ir and Rh-Cp-type metal complexes can be encapsulated inside a self-assembled M
    Language English
    Publishing date 2016-09-14
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 1478547-X
    ISSN 1521-3765 ; 0947-6539
    ISSN (online) 1521-3765
    ISSN 0947-6539
    DOI 10.1002/chem.201603017
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  5. Article ; Online: Gold(I) catalysis at extreme concentrations inside self-assembled nanospheres.

    Gramage-Doria, Rafael / Hessels, Joeri / Leenders, Stefan H A M / Tröppner, Oliver / Dürr, Maximilian / Ivanović-Burmazović, Ivana / Reek, Joost N H

    Angewandte Chemie (International ed. in English)

    2014  Volume 53, Issue 49, Page(s) 13380–13384

    Abstract: Homogeneous transition-metal catalysis is a crucial technology for the sustainable preparation of valuable chemicals. The catalyst concentration is usually kept as low as possible, typically at mM or μM levels, and the effect of high catalyst ... ...

    Abstract Homogeneous transition-metal catalysis is a crucial technology for the sustainable preparation of valuable chemicals. The catalyst concentration is usually kept as low as possible, typically at mM or μM levels, and the effect of high catalyst concentration is hardly exploited because of solubility issues and the inherent unfavorable catalyst/substrate ratio. Herein, a self-assembly strategy is reported which leads to local catalyst concentrations ranging from 0.05 M to 1.1 M, inside well-defined nanospheres, whilst the overall catalyst concentration in solution remains at the conventional mM levels. We disclose that only at this high concentration, the gold(I) chloride is reactive and shows high selectivity in intramolecular CO and CC bond-forming cyclization reactions.
    MeSH term(s) Catalysis ; Gold/chemistry ; Models, Molecular ; Nanospheres/chemistry ; Nanotechnology ; Transition Elements/chemistry
    Chemical Substances Transition Elements ; Gold (7440-57-5)
    Language English
    Publishing date 2014-12-01
    Publishing country Germany
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2011836-3
    ISSN 1521-3773 ; 1433-7851
    ISSN (online) 1521-3773
    ISSN 1433-7851
    DOI 10.1002/anie.201406415
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: In situ phosphine oxide reduction: a catalytic Appel reaction.

    van Kalkeren, Henri A / Leenders, Stefan H A M / Hommersom, C Rianne A / Rutjes, Floris P J T / van Delft, Floris L

    Chemistry (Weinheim an der Bergstrasse, Germany)

    2011  Volume 17, Issue 40, Page(s) 11290–11295

    Abstract: Several important reactions in organic chemistry thrive on stoichiometric formation of phosphine oxides from phosphines. To avoid the resulting burden of waste and purification, cyclic phosphine oxides were evaluated for new catalytic reactions based on ... ...

    Abstract Several important reactions in organic chemistry thrive on stoichiometric formation of phosphine oxides from phosphines. To avoid the resulting burden of waste and purification, cyclic phosphine oxides were evaluated for new catalytic reactions based on in situ regeneration. First, the ease of silane-mediated reduction of a range of cyclic phosphine oxides was explored. In addition, the compatibility of silanes with electrophilic halogen donors was determined for application in a catalytic Appel reaction based on in situ reduction of dibenzophosphole oxide. Under optimized conditions, alcohols were effectively converted to bromides or chlorides, thereby showing the relevance of new catalyst development and paving the way for broader application of organophosphorus catalysis by in situ reduction protocols.
    MeSH term(s) Catalysis ; Hydrocarbons, Brominated/chemistry ; Molecular Structure ; Organophosphorus Compounds/chemical synthesis ; Organophosphorus Compounds/chemistry ; Oxides/chemistry ; Phosphines/chemistry ; Stereoisomerism
    Chemical Substances Hydrocarbons, Brominated ; Organophosphorus Compounds ; Oxides ; Phosphines
    Language English
    Publishing date 2011-09-26
    Publishing country Germany
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1478547-x
    ISSN 1521-3765 ; 0947-6539
    ISSN (online) 1521-3765
    ISSN 0947-6539
    DOI 10.1002/chem.201101563
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  7. Article ; Online: Total synthesis and antibiotic activity of dehydrohomoplatencin.

    Waalboer, Dennis C J / Leenders, Stefan H A M / Schülin-Casonato, Tanja / van Delft, Floris L / Rutjes, Floris P J T

    Chemistry (Weinheim an der Bergstrasse, Germany)

    2010  Volume 16, Issue 37, Page(s) 11233–11236

    MeSH term(s) Aminophenols/chemical synthesis ; Aminophenols/chemistry ; Aminophenols/pharmacology ; Anti-Bacterial Agents/chemical synthesis ; Anti-Bacterial Agents/chemistry ; Anti-Bacterial Agents/pharmacology ; Crystallography, X-Ray ; Enterococcus faecalis/drug effects ; Methicillin-Resistant Staphylococcus aureus/drug effects ; Microbial Sensitivity Tests ; Molecular Conformation ; Molecular Structure ; Nuclear Magnetic Resonance, Biomolecular ; Polycyclic Compounds/chemical synthesis ; Polycyclic Compounds/chemistry ; Polycyclic Compounds/pharmacology ; Stereoisomerism ; Streptococcus pneumoniae/drug effects
    Chemical Substances Aminophenols ; Anti-Bacterial Agents ; Polycyclic Compounds ; dehydrohomoplatencin ; platencin (XK356W8OOB)
    Language English
    Publishing date 2010-08-05
    Publishing country Germany
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1478547-x
    ISSN 1521-3765 ; 0947-6539
    ISSN (online) 1521-3765
    ISSN 0947-6539
    DOI 10.1002/chem.201001744
    Database MEDical Literature Analysis and Retrieval System OnLINE

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