Journal
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
Volume 211, Issue 1-2, Pages 227-235Publisher
ELSEVIER
DOI: 10.1016/j.molcata.2003.10.013
Keywords
dioxomolybdenum complex; oxovanadium complex; heterogenisation; sulfide oxidation; recycling
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Heterogenisation of new dioxomolybdenum and oxovanadium complexes bearing a trietoxysilyl group on modified ultra stable Y zeolite and mesoporous all-silica MCM-41 through covalent bonding to support is reported. All catalysts, homogeneous and heterogenised, are active and highly selective in the oxidation of alkyl phenyl sulfides to sulfoxides using TBHP or H2O2 as final oxidants. The corresponding sulfones were obtained in quantitative yield when 2.5 equivalents of oxidant were used. The heterogenised catalysts have shown a comparable activity respect to the corresponding homogeneous ones. Lifetime of heterogenised catalysts has been examined by repeated use of the complexes leading similar rates and yields of sulfoxide, without appreciable loss of metal over several runs, when molybdenum complexes were used as catalysts. (C) 2003 Elsevier B.V. All rights reserved.
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