Buscar
Mostrando ítems 1-10 de 16
Ionic liquids as phase transfer catalysts: enhancing the biphasic extractive epoxidation reaction for the selective synthesis of β-O-glycosides
(Pergamon-Elsevier Science Ltd, 2017-08)
Ionic liquids promoted the direct epoxidation of glycals acting as PTC. 1,2-anhydrosugars were prepared by the oxidation of glycals under biphasic conditions with dimethydioxirane generated in situ from oxone/acetone and ...
Efficient Routes to Racemic and Enantiomerically Pure (S)-BINOL Diesters
(Taylor & Francis, 2013-09-04)
A systematic study for esterification procedures to the synthesis of BINOL diesters is described. Reaction conditions with TFAA and 85% H3PO4 were selected as the best procedure to prepare enantiomerically pure (S)-BINOL ...
Allylic alcohol synthesis by gas-phase hydrogen transfer reduction of unsaturated ketones
(Elsevier Science, 2005-06)
The gas-phase hydrogen transfer reduction (HTR) of mesityl oxide (MO) with 2-propanol to selectively obtain allylic alcohols was studied on MgO. MO was converted directly to 4-methyl-3-penten-2ol (UOL1) or isomerised to ...
Three-phase mass transfer: theoretical development of the overall effectiveness factor for cylindrical geometries
(Springer, 2021-05-06)
This work presents a theoretical analysis for predicting the overall effectiveness factor (η) for cylindrical geometries in a three-phase catalytic reaction system. Implicit expressions for η, taking into account all the ...
Catalytic and spectroscopic study of the allylic alcohol synthesis by gas-phase hydrogen transfer reduction of unsaturated ketones on acid-base catalysts
(Elsevier Science, 2006-08)
The hydrogen transfer reduction of an α,β-unsaturated ketone, mesityl oxide, was studied on several single oxides in the gas-phase using 2-propanol as a hydrogen source. Selectivity is essentially determined by oxide ...
Liquid-phase transfer hydrogenation of furfural to furfuryl alcohol on Cu–Mg–Al catalysts
(Elsevier, 2014-08)
The liquid-phase transfer hydrogenation of furfural on Cu-based catalysts was studied. Catalysts were prepared by incipient wetness impregnation (Cu/SiO2) and co-precipitation (Cu–Mg–Al). The effect of metal-support ...
Liquid-phase transfer hydrogenation of furfural to furfuryl alcohol on Cu-Mg-Al catalysts
(Elsevier, 2015-01)
The liquid-phase transfer hydrogenation of furfural on Cu-based catalysts was studied. Catalysts were prepared by incipient wetness impregnation (Cu/SiO2) and co-precipitation (Cu-Mg-Al). The effect of metal-support ...
Composite H3PW12O40–TiO2 catalysts for toluene selective photo-oxidation
(Elsevier Science, 2018-06-05)
A series of composite systems based on titania and growing quantities of tungstophosphoric acid are prepared and characterized using infrared, nuclear resonance, UV–visible, photoluminescence, and photoelectron spectroscopies, ...
Composite H3PW12O40–TiO2 catalysts for toluene selective photo-oxidation
(Elsevier Science, 2017-11-22)
A series of composite systems based on titania and growing quantities of tungstophosphoric acid are prepared and characterized using infrared, nuclear resonance, UV–visible, photoluminescence, and photoelectron spectroscopies, ...
Liquid phase selective hydrogenation of cinnamaldehyde over copper supported catalysts
(Elsevier Science, 2012-01-31)
The selective hydrogenation of cinnamaldehyde is carried out in a batch reactor, at 100 °C and 1 MPa of H 2 using isopropyl alcohol as the solvent, over a series of copper supported catalysts: Cu/Al 2O 3, Cu/SiO 2 Cu/MCM-48, ...