Journal
GREEN CHEMISTRY
Volume 11, Issue 9, Pages 1421-1427Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b903302e
Keywords
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Funding
- IDECAT NoE
- European Community [215193]
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The epoxidation of cyclohexene with aqueous hydrogen peroxide over mesostructured Ti(Cp)(2)Cl-2-grafted silica catalysts is described for the first time. Three kinds of Ti-containing systems with different textural properties have been employed: Ti/SiO2, Ti/MCM-41 and Ti/MCM-48. A minimal local H2O2 concentration in the surroundings of Ti sites, obtained by a controlled dropwise addition of aqueous H2O2 (4.17 mmol H2O2 h(-1) g(cat)(-1)), is crucial for an effective and highly selective epoxidation. Excellent selectivity (>98%) in cyclohexene epoxide is obtained at the end of the slow H2O2 addition in acetonitrile. Higher yields in epoxide are found over Ti/MCM-48 than over Ti/MCM-41 or Ti/SiO2 thanks to better isolation, dispersion and stability of Ti(IV) sites.
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