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Showing 1 to 20 of 41 for “"Salen"”.
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Mn(salen)- und Fe(porph)-katalysierte enantioselektive Epoxidierungen
… Potential von chiralen Eisenporphyrin- und Mangansalen-Katalysatoren zur kinetischen Racematspaltung sekundärer Allylalkohole durch asymmetrische Epoxidierung auszuloten. Zum anderen sollten Untersuchungen zum Mechanismus der Jacobsen-Katsuki-Epoxidierung durchgeführt werden; ein besonderes …
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Enantioselective ring opening reactions catalysed by heterogenized metal salen complexes
… Co(III)OAc and Cr(III)Cl substituted Jacobsen salen complexes was tested in several asymmetric ring opening (ARO) reactions. All homogeneous catalysts were found to be highly active in the here investigated Kinetic Resolution reactions (styrene oxide with water, cyclohexene oxide with benzoic …
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Enantioselective catalysis using heterogeneous and dissymmetric salen complexes of Mn and Cr
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1999.
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Distal hydrogen-bonding effects and cofacial bimetallic salen architectures for oxygen activation chemistry
… poised over a redox active manganese salophen or salen platform. The complexes proved to be proficient catalase mimics (disproportionation of hydrogen peroxide to water and oxygen). Detailed spectroscopic, computational, and structure-function relationship studies elucidated the key redox, steric, …
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Encapsulation of Achiral Mn(Salen) Complexes Into Cytochrome C Peroxidase: Spectroscopic Characterizations and Epoxidation Studies
The powerfulness and potential of this strategy have been successfully demonstrated. Other achiral catalytic metal complexes can also be incorporated into CcP or other protein scaffolds to produce a library of biocatalysts to perform various organic transformations.
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Synthese von immobilisierten Übergangsmetall-Salen-Komplexen, deren Charakterisierung und Einsatz in der enantioselektiven Epoxidierung von 1,2-Dihydronaphthalin
Synthesis of immobilized transitionmetal-salen-complexes, their characterization and use in enatioselective epoxidation of 1,2-dihydronaphthalene by Dipl.-Chem. Eugen Möllmann born in Sindi/Estonia Several transitionmetal-salen-complexes were immobilized in mesoporous materials. These were …
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Polyethylene-based Polar Block Copolymers Preparation using Organometallic-Mediated Radical Polymerization
… several polymerization techniques. The Co(salen) offers reactivities in mediating the polymerization of various monomers. This study addressed these challenges by employing polymer-Co(salen) complexes and conducting the synthesis of several polyethylene-b-polar polymers using only the …
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Asymmetric catalytic epoxidations of simple olefins
Two types of chiral (salen)Mn(III) complexes, either cationic or neutral, were synthesized by complexation of the corresponding chiral salen ligands with manganese salt. Neutral Mn(III) salen complexes were prepared from the ligands and $\rm Mn(OAc)\sb2{\cdot}4H\sb2O$ via in situ aerial oxidation …
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Elektronische Wechselwirkungen in drei- und mehrkernigen cyanidverbrückten Metallkomplexen
… vom Typ trans-[{L´nM´-CN}2ML4] (L = Cyclam, Salen) zeigen, daß Metall-Metall-Wechselwirkungen über ca. 10 Å hinweg in Komplexen mit zentralen M(Salen)-Bausteinen die Regel sind. Substanzen mit zentralen M(Cyclam)-Einheiten zeigen bis auf eine Ausnahme keine solchen Interaktionen. Das …
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Design and Synthesis of Redox or Catalytically Active Artificial Metalloproteins Containing Non-Native Inorganic and Organometallic Complexes
… metal complexes, such as ferrocene and manganese salen (Mn(Salen)) to the active sites of cytochrome c peroxidase (CcP) and sperm whale myoglobin (Mb) using cysteine residues. The new metalloproteins were characterized by UV-Vis, CD, electrospray mass spectroscopy and cyclic voltammetry. Together …
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Elektropolymerisation, Spektroelektrochemie und Potentiometrie von funktionalisierten leitfähigen Polymeren
… wird sowohl in der Polymer-Hauptkette (Polysalene) als auch in der Polymer-Seitenkette (ein Thiophen-Copolymer: 3-Methylthiophen/6-Hydroxy-2-(2-(3-thienyl)-ethoxy)-acetophenon) dargestellt. Die Redox-Prozesse der funktionalisierten Polymere wurden mit spektroelektrochemischen Methoden: ESR-, …
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Using Unnatural Amino Acids and Nonnative Cofactors for Metalloprotein Design and Engineering
Different positions for anchoring the salen cofactor to the Mb scaffold were observed to affect both the rate and selectivity of the artificial enzyme in a modular and accumulative fashion. Molecular dynamic simulations indicate that these changes may be due to the steric effects of the linker arms …
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Metalloprotein Engineering Using Heme Protein Scaffolds to Investigate the Oxidation of Endogenous Aromatic Amino Acids and Exogenous Substrates
… used to study heme proteins and artificial Mn-salen containing metalloenzymes using heme protein scaffolds. Heme proteins perform a wide variety of functions including the catalysis of numerous different reactions. Some of the structural features involved in conferring these functional …
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La Victoria, universo animal
… sus animales sufren, se están muriendo, no salen a pasear y viven en un entorno estresante, su único alivio es el momento de la comida (que tampoco es la mejor) y poder dormir tranquilos, ya casi ninguno juega, no interactúan con más individuos que ellos mismos, sin embargo son felices, …
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Acceso al financiamiento Pyme en Argentina : características de la gestión interna de las empresas que dificultan su entrada al mercado de créditos bancarios : ¿de qué manera puede colaborar una Sociedad de Garantía Recíproca para facilitar la obtención de financiamiento?
… se acerca al banco para solicitar un préstamo, salen a la luz falencias asociadas a: cómo se presenta el proyecto de solicitud de fondos; a qué línea de crédito se apunta; a la falta de capacidad para reunir la documentación requerida y al respaldo necesario en término de garantías para afrontar …
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Asymmetric synthesis involving silicon
… have been investigated using manganese (III) salen complexes as a catalyst. A number of axial ligands of the salen complexes has been studied and some of these axial ligands were very effective to influence the reactivity of the catalyst, <i>cis / trans</i> ratio of the silyl epoxides and …
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Transition metal complexes of pentadentate ligands
… in pyridine which is in contrast to Ni(X-SALEN). The alkyl derivatives were all primary in nature and very stable to light, air, and H₂0 which in contrast to the alkyl derivatives of Co(X-SALEN) which happen to be photolabile. The geometry around the cobalt atom in R-Co-(SALDIPN) was …
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Catalyst immobilization techniques for continuous flow synthesis
… chemistry. The use of a fluorous-tagged Co(III)-salen catalyst to effect the ring opening of epoxyhexane with water is presented. Application of the platform to the ring closing metathesis of N,Ndiallyltosylamide using a fluorous-tagged Hoveyda-Grubbs metathesis catalyst results in significantly …
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