publication . Article . 2015

Modified Ta/MCM-41 catalysts for enantioselective oxidation of thioanisole

Fadhli, Marwa; Khedher, Ilyes; Fraile, José M.;
Open Access English
  • Published: 01 Jan 2015 Journal: Journal of Molecular Catalysis A: Chemical 410: 140-148 (2015) (issn: 1381-1169, Copyright policy)
  • Publisher: Elsevier
Abstract
Ta-MCM41 catalysts have been prepared by grafting of Ta(OEt)5 on MCM41, pre-calcined at three different temperatures (550, 650 and 750 °C). These solids have been modified with two chiral ligands: R-(+)-diethyl l-tartrate (DET) and R-(+)-diisopropyl l-tartrate (DIPT). The formation of the chiral tantalum species and their influence on the structure of MCM41 have been studied by several characterization techniques, such as XRD, FTIR, N2 adsorption isotherms and MAS NMR. The grafted tantalum species are always much less active than the homogeneous analogues in the oxidation of thioanisole (methyl phenyl sulfide) with either aqueous H2O2 or alkyl (tert-butyl, TBHP,...
Subjects
free text keywords: Enantioselective oxidation, Sulfoxide, Tantalum, MCM-41
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