English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/184971
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE
Exportar a otros formatos:

Title

Comparison of Ta–MCM-41 and Ti–MCM-41 as catalysts for the enantioselective epoxidation of styrene with TBHP

AuthorsFadhli, Marwa; Khedher, Ilyes; Fraile, José M.
KeywordsAsymmetric catalysis
Supported catalysts
Tantalum
Epoxidation
Titanium
Mesoporous materials
Issue Date2017
PublisherElsevier
CitationComptes Rendus Chimie 20(8): 827-832 (2017)
AbstractChiral Ti–MCM-41 and Ta–MCM-41 catalysts have been prepared by grafting of Ti(OiPr)4 and Ta(OEt)5 and the modification with R-(+)-diethyl l-tartrate or R-(+)-diisopropyl l-tartrate. In general, the solid catalysts are more active and selective than their homogeneous counterparts in the epoxidation of styrene with tert-butyl hydroperoxide. The enantioselectivities depend on both the nature of the chiral ligand and the calcination temperature of the support, as it is supposed this controls the type of surface species that are formed. The best result of 71% ee is obtained with DIPT–Ta–MCM550 and is the first example of the use of a Ta catalyst for the enantioselective epoxidation of unfunctionalized alkenes. Nonetheless, the recovered Ta catalysts are less active and selective.
Publisher version (URL)https://doi.org/10.1016/j.crci.2017.02.008
URIhttp://hdl.handle.net/10261/184971
DOI10.1016/j.crci.2017.02.008
ISSN1631-0748
E-ISSN1878-1543
Appears in Collections:(ISQCH) Artículos
Files in This Item:
File Description SizeFormat 
accesoRestringido.pdf59,24 kBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 

Related articles:


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.