Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/8973
Share/Export:
logo share SHARE logo core CORE BASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE
Title

Effect of precursor nature on the behavior of titanium-polysiloxane homogeneous catalysts in primary alkene epoxidation

AuthorsBlanco Brieva, Gema; Capel Sánchez, María del Carmen; Campos Martín, José Miguel CSIC ORCID ; García Fierro, José Luis CSIC ORCID
KeywordsEpoxidation
Titanium
Homogeneous catalysis
Alkenes
Issue Date13-Jan-2007
PublisherElsevier
CitationJournal of Molecular Catalysis A: Chemical 269(1-2): 133-140 (2007)
AbstractThis work describes the synthesis, some structural characteristics and the performance of a series of titanium-containing polysiloxanes as homogeneous catalysts. These polysiloxanes were synthesized by mixing a titanium precursor, such as tetraisopropoxytitanium or tetrakis(2-ethylhexyloxy) titanium, with a silicon precursor of the trichloro(phenyl)silane, triethoxy(phenyl)silane or trimethoxy(phenyl)silane type in toluene solvent and then slowly hydrolyzing with water. Depending on the precursors, the polysiloxanes exhibited different physical properties; some of them were solids, while others were viscous liquids or even fluid liquids. These properties are related to the molecular weight of the polysiloxane, which is determined by the nature of the precursors. All the Ti-containing polysiloxanes were tested in the epoxidation reaction of oct-1-ene using EBHP (ethylbenzene hydroperoxide) as an oxidant. The reaction was selective to epoxide since in all cases the only product detected from the oct-1-ene was 1,2-epoxyoctane. The conversion profile of EBHP was found to depend not only on the amount of titanium incorporated into the polymeric structure but also on the symmetry and chemical environment of TiIV sites. It was observed that polysiloxanes containing tetrahedrally coordinated TiIV resulted in active catalysts whereas those in which titanium appeared in an octahedral environment were found to be inactive in alkene epoxidation.
Description8 pages, 6 figures.-- Printed version published on May 18, 2007.
Publisher version (URL)http://dx.doi.org/10.1016/j.molcata.2007.01.013
URIhttp://hdl.handle.net/10261/8973
DOI10.1016/j.molcata.2007.01.013
ISSN1381-1169
Appears in Collections:(ICP) Artículos

Show full item record
Review this work

SCOPUSTM   
Citations

8
checked on May 19, 2022

WEB OF SCIENCETM
Citations

7
checked on May 17, 2022

Page view(s)

338
checked on May 21, 2022

Google ScholarTM

Check

Altmetric

Dimensions


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