Dioxomolybdenum(VI) Epoxidation Catalyst Supported on Mesoporous Silica Containing Phosphane Oxide Groups
authors Castro, A; Alonso, JC; Neves, P; Valente, AA; Ferreira, P
nationality International
journal EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
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.
publisher WILEY-V C H VERLAG GMBH
issn 1434-1948
year published 2010
issue 4
beginning page 602
ending page 607
digital object identifier (doi) 10.1002/ejic.200900918
web of science category Chemistry, Inorganic & Nuclear
subject category Chemistry
unique article identifier WOS:000274595000009
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