|
authors |
Castro, A; Alonso, JC; Neves, P; Valente, AA; Ferreira, P |
|
nationality |
International |
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journal |
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY |
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author keywords |
Molybdenum; P ligands; Mesoporous materials; Homogeneous catalysis; Epoxidation; Ionic liquids |
|
keywords |
TERT-BUTYL HYDROPEROXIDE; OLEFIN EPOXIDATION; CRYSTAL-STRUCTURES; HETEROGENEOUS CATALYSTS; MCM-41 MATERIALS; LEWIS-BASE; COMPLEXES; MOLYBDENUM; CYCLOOCTENE; LIGANDS |
|
abstract |
A new mesoporous hybrid material (denoted LP-TEPPPO-Mo) has been prepared by tethering [MoO(2)Cl(2)] onto mesoporous silica previously functionalised with phosphane oxide spacer ligands. The LP-TEPPPO-Mo material was tested in the liquid-phase epoxidation of olefins [cis-cyclooctene, (R)-(+)-limonene, trans-2-octene and 1-octene] with tBuOOH, at 55 degrees C, and without a co-solvent, giving at least 90% selectivity to the corresponding epoxide at 36-77% conversion: in the case of limonene, regioselectivity favours the epoxidation of the endocyclic double bond, giving mainly 1,2-epoxy-p-menth-8-ene. The catalytic system based on a liquid-liquid biphasic system containing the homogeneous complex [MoCl(2)(O)(2)[OP(CH(2)CH(3))(Ph)(2)}(2)] dissolved in the ionic liquid 1-butyl-4-methylpyridinium tetrafluoroborate leads to lower epoxide selectivity (91% at 64 % conversion) in the reaction of cyclooctene in comparison to that observed for LPTEPPPO-Mo (100 % at 87 % conversion). The reused solid-liquid and liquid-liquid biphasic catalytic systems show partial loss of catalytic activity. |
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publisher |
WILEY-V C H VERLAG GMBH |
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issn |
1434-1948 |
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year published |
2010 |
|
issue |
4 |
|
beginning page |
602 |
|
ending page |
607 |
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digital object identifier (doi) |
10.1002/ejic.200900918 |
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web of science category |
Chemistry, Inorganic & Nuclear |
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subject category |
Chemistry |
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unique article identifier |
WOS:000274595000009
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