Polymer-supported Mo alkene epoxidation catalysts

Sherrington, David C.; Simpson, S.

doi:10.1016/0923-1137(93)90007-3

Cited by 42 publications

(5 citation statements)

References 10 publications

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“…This induction period indicates a change in the catalyst structure induced by the reaction mixture. This effect was also observed in heterogeneous catalysts prepared with imidazolium polymers in presence of Mo-O-Mo [30,31]. WE catalysts characterization indicates the presence of this kind of molybdenum species.…”

Section: Activity Testssupporting

confidence: 55%

Catalytic Epoxidation of Cyclohexene with Tert-butylhydroperoxide Using an Immobilized Molybdenum Catalyst

et al. 2015

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This work describes the synthesis of molybdenum complexes immobilized on a silica support and their performance in the epoxidation reaction of cyclohexene using tertbutylhydroperoxide (TBHP) as the oxidizing agent. The catalyst synthesis included solubilization of variable amounts of bis-oxomolybdenum (VI) acetylacetonate precursor in different solvents such as tetrahydrofuran (THF), ethanol, THF/water and ethanol/water mixtures and contact with the silica support. Characterization techniques demonstrated that the nature of the incorporated molybdenum species depends markedly on the solvent employed. If the solvent employed is an ethanol:water mixture, physical adsorption of the Mo-species onto the support surface occurs; however, when THF is used as the solvent (THF catalyst series), molybdenum is grafted on the silica surface via chemical bonding with the surface hydroxyl groups of silica. Specifically, these latter catalysts show similar performance to that of the homogeneous catalyst, although long-term experiments showed deactivation by leaching of the active phase.

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Section: Activity Testssupporting

confidence: 55%

Catalytic Epoxidation of Cyclohexene with Tert-butylhydroperoxide Using an Immobilized Molybdenum Catalyst

et al. 2015

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“…Some early examples used polystyrenes and polymethylacrylate based resins to which nitrogen-based ligands such as amino methylpyridine were attached. 30,31 Compounds such as PBI 32,33,40,41 and polyimides, 34 being highly thermo-and oxidation stable were also developed (Fig. 3).…”

Section: Polymer-supported Complexesmentioning

confidence: 99%

Immobilization of monomeric organometallic molybdenum oxo and carbonyl complexes and their application in epoxidation reactions

Jain

Kühn

2008

Dalton Trans.

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Various oxomolybdenum complexes are efficient and selective homogeneous catalysts in the presence of organic hydroperoxides. The increasing interest in the heterogenisation of such catalysts has led to an increased interest in finding suitable support materials for the complexes. These supports include ionic liquids, mesoporous materials and zeolites to name a few. Several methods are used to anchor the catalyst depending on the nature of the carrier material. The supported catalysts combine properties of homogeneous catalysts such as reactivity, control and selectivity with those of heterogeneous catalysts such as enhanced stability and recyclability.

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“…Poly (styrene‐ co ‐4‐vinlypyridine) has been used as support to immobilize molybdenum compounds by some groups,7, 18 and these heterogeneous catalysts show outstanding catalytic activity in olefin epoxidation in the presence of tert‐butyl hydroperoxide 19. Tert‐butyl hydroperoxide usually produces by‐product, while hydrogen peroxide is an attractive oxidant based on environmental and economic account.…”

Section: Introductionmentioning

confidence: 99%

Preparation and catalytic application of poly 4‐vinylpyridine microspheres

Cao

Wang

Song

et al. 2010

J of Applied Polymer Sci

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Poly 4-vinylpyridine (P4VP) microspheres between 170 and 728 nm were synthesized by Emulsifier-Free Emulsion Polymerization. The monomer concentration, ionic strength, and initiator concentration affected the microsphere size and size distribution. The increasing monomer concentration led to the increase of microsphere size, whereas the size distribution of the resultant P4VP microspheres increased with the increasing ionic strength of the reaction systems. Mo(O 2 ) 2 OÁ2DMF was successfully anchored onto the P4VP microspheres by ligand exchange, and the heterogeneous catalyst showed high-catalytic activity for epoxidation of cis-cyclooctene with environmentally friendly hydrogen peroxide. The size and morphology of the supported microspheres has important influence on the catalytic activity.

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Polymer-supported Mo alkene epoxidation catalysts

Cited by 42 publications

References 10 publications

Catalytic Epoxidation of Cyclohexene with Tert-butylhydroperoxide Using an Immobilized Molybdenum Catalyst

Catalytic Epoxidation of Cyclohexene with Tert-butylhydroperoxide Using an Immobilized Molybdenum Catalyst

Immobilization of monomeric organometallic molybdenum oxo and carbonyl complexes and their application in epoxidation reactions

Preparation and catalytic application of poly 4‐vinylpyridine microspheres

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