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Aerobic Oxidations Catalyzed by Zeolite-Encapsulated Cobalt Salophen
Stockholm University, Faculty of Science, Department of Organic Chemistry.
Stockholm University, Faculty of Science, Department of Organic Chemistry.
Stockholm University, Faculty of Science, Department of Physical, Inorganic and Structural Chemistry.
Stockholm University, Faculty of Science, Department of Organic Chemistry.
2008 (English)In: Advanced Synthesis and Catalysis, ISSN 1615-4150, E-ISSN 1615-4169, Vol. 350, no 11-12, 1807-1815 p.Article in journal (Refereed) Published
Abstract [en]

Cobalt salophen was encapsulated in a series of zeolites with a wide variation of the silicon-to-aluminium atomic ratio and with different cations. The zeolite-cobalt salophen catalysts were prepared using the “ship-in-a-bottle technique” where the complex was synthesized in the super cage of the zeolite and therefore locked into the pocket. The encapsulated catalysts were then tested in the aerobic oxidation of hydroquinone to p-benzoquinone; the best encapsulated catalyst was shown to be an efficient electron-transfer mediator in a palladium-catalyzed aerobic oxidative carbocyclization.

Place, publisher, year, edition, pages
2008. Vol. 350, no 11-12, 1807-1815 p.
Keyword [en]
aerobic oxidation, cobalt salophen, nanostructures, zeolite
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:su:diva-24867DOI: 10.1002/adsc.200800294ISI: 000258503600021OAI: oai:DiVA.org:su-24867DiVA: diva2:198440
Available from: 2008-04-24 Created: 2008-04-24 Last updated: 2017-12-13Bibliographically approved
In thesis
1. Development of Biomimetic Catalytic Systems for Selective Oxidations with H2O2 and O2
Open this publication in new window or tab >>Development of Biomimetic Catalytic Systems for Selective Oxidations with H2O2 and O2
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Four different catalytic systems were studied for biomimetic coupled oxidations using H2O2 or O2. In the first example, osmium tetroxide works as a substrate-selective catalyst for dihydroxylation of olefins. Electron transfer to H2O2 is facilitated by electron transfer mediators (ETMs). In one case VO(acac)2 or MeReO3 was used as ETM; in the other case a combination of flavin and tertiary amine was used as ETMs. These three systems were immobilized in the ionic liquid [bmim]PF6 for the purpose of recycling of the catalyst.

In the second example, an organocatalyst (a flavin) was used for the oxidation of sulfides to sulfoxides and this catalytic system was recycled and reused in an ionic liquid.

In the third example, primary aromatic amines were oxidized by H2O2 to nitroso compounds in a selenium-catalyzed oxidation. The nitrosoarenes were used in a one-pot hetero Diels-Alder reaction with dienes forming 1,2-oxazines.

In the fourth example, a cobalt salophen complex was immobilized in different zeolites. The catalyst was used in aerobic oxidation of p-hydroquinone and the zeolite catalyst could be reused. The oxidative carbocyclization of ene-allenes was tested successfully using the triple catalytic system consisting of palladium(II), p-benzoquinone, and the immobilized catalyst for O2 activation.

All these systems gave mild and selective oxidations with environmentally friendly and inexpensive terminal oxidants.

Place, publisher, year, edition, pages
Department of Organic Chemistry, 2008. 66 p.
Keyword
Biomimetic oxidations, catalyst immobilization, dihydroxylation, sulfoxidation, flavin
National Category
Chemical Sciences
Research subject
Organic Chemistry
Identifiers
urn:nbn:se:su:diva-7502 (URN)978-91-7155-646-2 (ISBN)
Public defence
2008-05-15, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 12 A, Stockholm, 13:00
Opponent
Supervisors
Available from: 2008-04-24 Created: 2008-04-24Bibliographically approved

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Johansson, MikaelTerasak, OsamuBäckvall, Jan-E.
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