authors |
Gomes, AC; Bruno, SM; Tome, C; Valente, AA; Pillinger, M; Abrantes, M; Goncalves, IS |
nationality |
International |
journal |
JOURNAL OF ORGANOMETALLIC CHEMISTRY |
author keywords |
Molybdenum; Cyclopentadienyl complexes; Carbonyl ligands; Methylated cyclodextrins; Olefin epoxidation |
keywords |
CYCLOPENTADIENYL-MOLYBDENUM COMPLEXES; TUNGSTEN COMPLEXES; ETA(5)-CYCLOPENTADIENYL MOLYBDENUM; MESOPOROUS MATERIALS; TRICARBONYL COMPLEX; CYCLOALKYL MOIETIES; CARBONYL-COMPLEXES; BETA-CYCLODEXTRIN; BRIDGING UNITS; ANSA COMPOUNDS |
abstract |
The cyclopentadienyl molybdenum tricarbonyl complex CpMo(CO)(3)(CH2-pC(6)H(4)-CO2CH3) (1) (Cp = eta(5)-C5H5) and its 1:1 inclusion complexes with heptakis(2,6-di-O-methyl)-beta-cyclodextrin (1@DIMEB) and heptakis(2,3,6-tri-O-methyl)-beta-cyclodextrin (1@TRIMEB) were prepared and characterized by elemental and thermogravimetric analyses, powder X-ray diffraction, NMR, FT-IR and Raman spectroscopy. All three compounds were investigated as catalyst precursors for olefin epoxidation using cis-cyclooctene (Cy) as a model substrate, a reaction temperature of 55 degrees C, and different types of oxidants (tert-butylhydroperoxide in decane;(TBHPdec) or in water (TBHPaq), and aqueous hydrogen peroxide). With the aim of facilitating recycling of the homogeneous catalytic systems, different solvent mixtures were tested: biphasic liquid-liquid solvent systems [(water, glycerol, ionic liquid)-(n-hexane, alpha,alpha,alpha-trifluorotoluene (TFT), iso-butyl methyl ketone)], and in some cases no cosolvent was added. Excellent epoxide selectivity (100%) was observed for all tested catalytic systems. An example of an interesting catalytic system is that of 1@TRIMEB/TBHPaq/TFT/H2O since the catalyst can be easily separated in the form of an aqueous solution, by decantation, from the organic phase containing the reaction products and recycled. (C) 2013 Elsevier B.V. All rights reserved. |
publisher |
ELSEVIER SCIENCE SA |
issn |
0022-328X |
year published |
2013 |
volume |
730 |
beginning page |
116 |
ending page |
122 |
digital object identifier (doi) |
10.1016/j.jorganchem.2012.12.019 |
web of science category |
Chemistry, Inorganic & Nuclear; Chemistry, Organic |
subject category |
Chemistry |
unique article identifier |
WOS:000318667600018
|
ciceco authors
impact metrics
journal analysis (jcr 2019):
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journal impact factor |
2.304 |
5 year journal impact factor |
1.963 |
category normalized journal impact factor percentile |
55.965 |
dimensions (citation analysis):
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altmetrics (social interaction):
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