79131 20190709135711.0 doi 10.1016/j.micromeso.2016.09.055 sideral 97427 ART-2017-97427 eng Ben Zid, T. New bis(oxazoline)–vanadyl complexes, supported by electrostatic interaction in Laponite clay, as heterogeneous catalysts for asymmetric oxidation of methyl phenyl sulfide 2017 Access copy available to the general public Unrestricted Chiral bis(oxazoline) ligands are used for the first time to promote the enantioselective vanadium-catalyzed oxidation of sulfides with alkyl hydroperoxides. Several bis(oxazoline)-VO complexes have been prepared and supported by cation exchange in Laponite clay. The substituent in the oxazoline ring, and the type of hydroperoxide are relevant parameters that control the activity and selectivity of the resulting catalysts. Tert-butyl hydroperoxide is more reactive but less enantioselective than cumenehydroperoxide, both with the neat and supported VO-bis(oxazoline) complexes. Activities and enantioselectivities obtained with the heterogeneous catalysts are always lower than in solution, and in general better and more consistent results are obtained with box(iPr) ligand which seems to be also the best chiral auxiliary in homogeneous phase, leading to a modest but significant enantioselectivity of 20% ee in heterogeneous phase and of 28% in homogeneous phase. The recovered of the best catalyst shows a decrease in the catalytic activity and in the enantioselectivity, in agreement with some decomplexation of the chiral ligand, whereas the supported vanadium species remain stable and recoverable. info:eu-repo/grantAgreement/ES/DGA/E11 info:eu-repo/grantAgreement/ES/MINECO/CTQ2014-52367-R info:eu-repo/semantics/openAccess by-nc-nd http://creativecommons.org/licenses/by-nc-nd/3.0/es/ 3.649 2017 MATERIALS SCIENCE, MULTIDISCIPLINARY 66 / 285 = 0.232 2017 Q1 T1 CHEMISTRY, APPLIED 12 / 71 = 0.169 2017 Q1 T1 NANOSCIENCE & NANOTECHNOLOGY 38 / 92 = 0.413 2017 Q2 T2 CHEMISTRY, PHYSICAL 51 / 146 = 0.349 2017 Q2 T2 1.08 2017 Chemistry (miscellaneous) 2017 Q1 Condensed Matter Physics 2017 Q1 Materials Science (miscellaneous) 2017 Q1 Mechanics of Materials 2017 Q1 Nanoscience and Nanotechnology 2017 Q2 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Fadhli, M. Khedher, I. (orcid)0000-0002-0136-5138 Fraile, J. M. Universidad de Zaragoza 2013 765 Universidad de Zaragoza Dpto. Química Orgánica Área Química Orgánica 239 (2017), 167-172 [17 p.] Microporous mesoporous mater. MICROPOROUS AND MESOPOROUS MATERIALS 1387-1811 365756 http://zaguan.unizar.es/record/79131/files/texto_completo.pdf Postprint 8584 http://zaguan.unizar.es/record/79131/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:79131 articulos driver 2019-07-09-12:55:12 ARTICLE