SILICA SUPPORTED RHODIUM METAL NANOPARTICLES STABILIZED WITH (-)-DIOP. EFFECT OF LIGAND CONCENTRATION AND METAL LOADING ON THE ENANTIOSELECTIVE HYDROGENATION OF KETONES

Supported nanoparticles (NPs) in presence of chiral ligand (L) were synthesized for their use in enantioselective hydrogenation reactions. Catalysts were obtained by chemical reduction from rhodium chloride hydrate, RhCl3x3H2O, in presence of (-)-DIOP ligand ((4R,5R)-4,5-Bis(diphenylphosphino-methyl...

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Autores principales:	RUIZ,DORIS, MELLA,CLAUDIO, FIERRO,JOSÉ L.G, REYES,PATRICIO
Lenguaje:	English
Publicado:	Sociedad Chilena de Química 2012
Materias:	chiral ligand, (-)-DIOP enantioselective hydrogenation Rh/SiO2 stabilized nanoparticles
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072012000400013
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spelling	oai:scielo:S0717-970720120004000132013-04-04SILICA SUPPORTED RHODIUM METAL NANOPARTICLES STABILIZED WITH (-)-DIOP. EFFECT OF LIGAND CONCENTRATION AND METAL LOADING ON THE ENANTIOSELECTIVE HYDROGENATION OF KETONESRUIZ,DORISMELLA,CLAUDIOFIERRO,JOSÉ L.GREYES,PATRICIO chiral ligand, (-)-DIOP enantioselective hydrogenation Rh/SiO2 stabilized nanoparticles Supported nanoparticles (NPs) in presence of chiral ligand (L) were synthesized for their use in enantioselective hydrogenation reactions. Catalysts were obtained by chemical reduction from rhodium chloride hydrate, RhCl3x3H2O, in presence of (-)-DIOP ligand ((4R,5R)-4,5-Bis(diphenylphosphino-methyl)-2,2-dimethyl-1,3-dioxolane) that allows to control NPs growing and to obtain solids having chiral surfaces. Chirally stabilized rhodium NPs on SiO2 were characterized using techniques such as: TEM, electron diffraction, EDS, nitrogen adsorption-desorption isotherms and XPS. This work includes the study of some variables such as metal loading and ligand concentration and their effect in metal core sizes, catalytic activity and enantioselectivity. Catalysts properties have also been evaluated in the hydrogenation of substrates: acetophenone (AP), 1-phenyl-1,2-propanedione (PPD), 3,4-hexanedione (HD), 2,3-butanedione (BD) and ethyl pyruvate (EP) as reaction test. Ligand plays a fundamental role in the synthesis of NPs and enantioselectivity in hydrogenations reactions. That is, due to it generates metal particle size < 5.8 nm compared with unstabilized systems that generate average diameter around 14 nm. Results indicate increased activity in catalytic systems obtained from the stabilization of NPs. Enantioselectivity levels reach values up to 53% due to the chiral ligand is on the catalysts surface.info:eu-repo/semantics/openAccessSociedad Chilena de QuímicaJournal of the Chilean Chemical Society v.57 n.4 20122012-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072012000400013en10.4067/S0717-97072012000400013
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	chiral ligand, (-)-DIOP enantioselective hydrogenation Rh/SiO2 stabilized nanoparticles
spellingShingle	chiral ligand, (-)-DIOP enantioselective hydrogenation Rh/SiO2 stabilized nanoparticles RUIZ,DORIS MELLA,CLAUDIO FIERRO,JOSÉ L.G REYES,PATRICIO SILICA SUPPORTED RHODIUM METAL NANOPARTICLES STABILIZED WITH (-)-DIOP. EFFECT OF LIGAND CONCENTRATION AND METAL LOADING ON THE ENANTIOSELECTIVE HYDROGENATION OF KETONES
description	Supported nanoparticles (NPs) in presence of chiral ligand (L) were synthesized for their use in enantioselective hydrogenation reactions. Catalysts were obtained by chemical reduction from rhodium chloride hydrate, RhCl3x3H2O, in presence of (-)-DIOP ligand ((4R,5R)-4,5-Bis(diphenylphosphino-methyl)-2,2-dimethyl-1,3-dioxolane) that allows to control NPs growing and to obtain solids having chiral surfaces. Chirally stabilized rhodium NPs on SiO2 were characterized using techniques such as: TEM, electron diffraction, EDS, nitrogen adsorption-desorption isotherms and XPS. This work includes the study of some variables such as metal loading and ligand concentration and their effect in metal core sizes, catalytic activity and enantioselectivity. Catalysts properties have also been evaluated in the hydrogenation of substrates: acetophenone (AP), 1-phenyl-1,2-propanedione (PPD), 3,4-hexanedione (HD), 2,3-butanedione (BD) and ethyl pyruvate (EP) as reaction test. Ligand plays a fundamental role in the synthesis of NPs and enantioselectivity in hydrogenations reactions. That is, due to it generates metal particle size < 5.8 nm compared with unstabilized systems that generate average diameter around 14 nm. Results indicate increased activity in catalytic systems obtained from the stabilization of NPs. Enantioselectivity levels reach values up to 53% due to the chiral ligand is on the catalysts surface.
author	RUIZ,DORIS MELLA,CLAUDIO FIERRO,JOSÉ L.G REYES,PATRICIO
author_facet	RUIZ,DORIS MELLA,CLAUDIO FIERRO,JOSÉ L.G REYES,PATRICIO
author_sort	RUIZ,DORIS
title	SILICA SUPPORTED RHODIUM METAL NANOPARTICLES STABILIZED WITH (-)-DIOP. EFFECT OF LIGAND CONCENTRATION AND METAL LOADING ON THE ENANTIOSELECTIVE HYDROGENATION OF KETONES
title_short	SILICA SUPPORTED RHODIUM METAL NANOPARTICLES STABILIZED WITH (-)-DIOP. EFFECT OF LIGAND CONCENTRATION AND METAL LOADING ON THE ENANTIOSELECTIVE HYDROGENATION OF KETONES
title_full	SILICA SUPPORTED RHODIUM METAL NANOPARTICLES STABILIZED WITH (-)-DIOP. EFFECT OF LIGAND CONCENTRATION AND METAL LOADING ON THE ENANTIOSELECTIVE HYDROGENATION OF KETONES
title_fullStr	SILICA SUPPORTED RHODIUM METAL NANOPARTICLES STABILIZED WITH (-)-DIOP. EFFECT OF LIGAND CONCENTRATION AND METAL LOADING ON THE ENANTIOSELECTIVE HYDROGENATION OF KETONES
title_full_unstemmed	SILICA SUPPORTED RHODIUM METAL NANOPARTICLES STABILIZED WITH (-)-DIOP. EFFECT OF LIGAND CONCENTRATION AND METAL LOADING ON THE ENANTIOSELECTIVE HYDROGENATION OF KETONES
title_sort	silica supported rhodium metal nanoparticles stabilized with (-)-diop. effect of ligand concentration and metal loading on the enantioselective hydrogenation of ketones
publisher	Sociedad Chilena de Química
publishDate	2012
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072012000400013
work_keys_str_mv	AT ruizdoris silicasupportedrhodiummetalnanoparticlesstabilizedwithdiopeffectofligandconcentrationandmetalloadingontheenantioselectivehydrogenationofketones AT mellaclaudio silicasupportedrhodiummetalnanoparticlesstabilizedwithdiopeffectofligandconcentrationandmetalloadingontheenantioselectivehydrogenationofketones AT fierrojoselg silicasupportedrhodiummetalnanoparticlesstabilizedwithdiopeffectofligandconcentrationandmetalloadingontheenantioselectivehydrogenationofketones AT reyespatricio silicasupportedrhodiummetalnanoparticlesstabilizedwithdiopeffectofligandconcentrationandmetalloadingontheenantioselectivehydrogenationofketones
_version_	1718445475194994688

SILICA SUPPORTED RHODIUM METAL NANOPARTICLES STABILIZED WITH (-)-DIOP. EFFECT OF LIGAND CONCENTRATION AND METAL LOADING ON THE ENANTIOSELECTIVE HYDROGENATION OF KETONES

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