6533b85dfe1ef96bd12bea69
RESEARCH PRODUCT
Heterogeneous oxidation of pyrimidine and alkyl thioethers in ionic liquids over mesoporous Ti or Ti/Ge catalysts.
Pedro AmorósDaniel BeltránChristopher HardacreJillian M. ThompsonValentin CimpeanuVasile I. Parvulescusubject
chemistry.chemical_classificationTitaniumMolecular StructureChemistryGermaniumOrganic ChemistryThioanisoleInorganic chemistryGeneral ChemistrySulfidesHeterogeneous catalysisSilicon DioxidePeroxideCatalysisCatalysischemistry.chemical_compoundPyrimidinesCatalytic oxidationIonic liquidSolventsParticle SizeTrifluoromethanesulfonateOxidation-ReductionPorosityAlkyldescription
Heterogeneous catalytic oxidation of a series of thioethers (2-thiomethylpyrimidine, 2-thiomethyl-4,6-dimethyl-pyrimidine, 2-thiobenzylpyrimidine, 2-thiobenzyl-4,6-dimethylpyrimidine, thioanisole, and n-heptyl methyl sulfide) was performed in ionic liquids by using MCM-41 and UVM-type mesoporous catalysts containing Ti, or Ti and Ge. A range of triflate, tetrafluoroborate, trifluoroacetate, lactate and bis(trifluoromethanesulfonyl)-imide-based ionic liquids were used. The oxidations were carried out by using anhydrous hydrogen peroxide or the urea-hydrogen peroxide adduct and showed that ionic liquids are very effective solvents, achieving greater reactivity and selectivity than reactions performed in dioxane. The effects of halide and acid impurities on the reactions were also investigated. Recycling experiments on catalysts were carried out in order to evaluate Ti leaching and its effect on activity and selectivity.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2004-09-21 | Chemistry (Weinheim an der Bergstrasse, Germany) |