New bis(oxazoline)–vanadyl complexes, supported by electrostatic interaction in Laponite clay, as heterogeneous catalysts for asymmetric oxidation of methyl phenyl sulfide

Ben Zid, T. ; Fadhli, M. ; Khedher, I. ; Fraile, J. M. (Universidad de Zaragoza)

Resumen: 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.

Idioma: Inglés

DOI: 10.1016/j.micromeso.2016.09.055

Año: 2017

Publicado en: MICROPOROUS AND MESOPOROUS MATERIALS 239 (2017), 167-172 [17 p.]
ISSN: 1387-1811

Factor impacto JCR: 3.649 (2017)

Categ. JCR: MATERIALS SCIENCE, MULTIDISCIPLINARY rank: 66 / 285 = 0.232 (2017) - Q1 - T1
Categ. JCR: CHEMISTRY, APPLIED rank: 12 / 71 = 0.169 (2017) - Q1 - T1
Categ. JCR: NANOSCIENCE & NANOTECHNOLOGY rank: 38 / 92 = 0.413 (2017) - Q2 - T2
Categ. JCR: CHEMISTRY, PHYSICAL rank: 51 / 146 = 0.349 (2017) - Q2 - T2

Factor impacto SCIMAGO: 1.08 - Chemistry (miscellaneous) (Q1) - Condensed Matter Physics (Q1) - Materials Science (miscellaneous) (Q1) - Mechanics of Materials (Q1) - Nanoscience and Nanotechnology (Q2)

Financiación: info:eu-repo/grantAgreement/ES/DGA/E11
Financiación: info:eu-repo/grantAgreement/ES/MINECO/CTQ2014-52367-R

Tipo y forma: Article (PostPrint)

Área (Departamento): Área Química Orgánica (Dpto. Química Orgánica)