Biphasic catalysis with RuCl2(DMSO)(TPPMS)3

Abstract A mononuclear RuCl 2 (DMSO)(TPPMS) 3 complex (1) (TPPMS ¼ triphenylphosphine monosulfonate) has been synthesized. Spectroscopic analysis by i.r., u.v.-vis., 1 H-, 13 C-, 31 P-n.m.r., cyclic voltammetry, m.s. analysis and MO calculations were in agreement with a possible octahedral structure. Biphasic (H 2 O/PhMe) catalytic studies have shown good olefin hydrogenation activity by the complex at moderate temperature and pressure

Optimización de parámetros en la hidroformilación de nafta catalítica con complejos de rodio y molibdeno en medio bifásico orgánico/agua

Catalytic naphtha hydroformylation with Rh and Mo complexes in biphasic medium. Parameter optimization. The Chlorocarbonyl bis-(diphenyl[meta-sulphonate of sodium phenyl]phosphine)Rhodium(I) [RhCl(CO)[P(C6H6)2(m-(C6H5)SO3Na)]2], Chlorocarbonyl bis-(phenyl[meta-sulphonate of sodium diphenyl]phosphine)Rhodium(I) [RhCl(CO)[P(C6H6)(m-(C6H5)SO3Na)2]2] and Tetracarbonyl bis-[para-pyridine sulphonate of sodium] Molybdenum (0) [Mo(CO)4(p-(NC5H4)SO3Na)2] (TPPMS Triphenylphosphine Monosulphonate = [P(C6H6)2 (m-(C6H5)SO3Na)] (TPPDS= Triphenylphosphine meta-disulphonate = [P(C6H6)(m-(C6H5)SO3Na)2] and pySO3Na= para-Pyridine sulphonate of sodium = [p-(NC5H4)SO3Na] complexes were used as catalytic precursors in the catalytic hydroformylation of real naphtha in biphasic organic/water medium. With complexes (1) and (2) there is a good conversion of olefins to medium sized linear and substituted aldehydes and alcohols, and with complex (3) not catalytic activity in hydroformylation reactions of light naphtha was observed

Nuevas estrategias en la enseñanza de la Química Inorgánica universitaria

Anuario Latinoamericano de Educación Química, ALDEQ [email protected]@[email protected]@[email protected]@ula.v

Aqueous biphasic olefin hydroformylation catalyzed by water-soluble rhodium complexes

Catalysis with water-soluble rhodium complexes, RhCl(CO)(TPPMS)2, [TPPMS = P(C6H5)2(C6H4SO3)] (1), RhCl(CO)(TPPDS)2, [TPPDS = P(C6H5)(C6H4SO3)2] (2) and RhCl(CO)(TPPTS)2, [TPPTS = P(C6H4SO3)3] (3) in hydroformylation of 1-hexene, 2-pentene, 2,3-dimethyl-1-butene, cyclohexene and several mixtures of these olefins have been studied, under moderate reaction conditions (T: 50–150 C; pCO/pH2 = 1; total p: 14–68 bar; Substrate/ Catalyst: 600/1) in biphasic toluene/water media. The catalytic system shows high activity but low selectivity. The linear and branched oxygenated products obtained are equally useful in naphtha upgrading, as observed in the real El Palito naphtha tried. The catalysts can be recycled several times without significant activity [email protected]@ula.ve, [email protected]@[email protected]@[email protected]

Biphasic catalysis with RuCl2(DMSO)(TPPMS)3

A mononuclear RuCl2(DMSO)(TPPMS)3 complex (1) (TPPMS ¼ triphenylphosphine monosulfonate) has been synthesized. Spectroscopic analysis by i.r., u.v.–vis., 1H-, 13C-, 31P-n.m.r., cyclic voltammetry, m.s. analysis and MO calculations were in agreement with a possible octahedral structure. Biphasic (H2O/PhMe) catalytic studies have shown good olefin hydrogenation activity by the complex at moderate temperature and [email protected]@ula.ve, [email protected]@[email protected]@[email protected]

Hidrogenación de Aromáticos en la Catálisis del Complejo Ru(η5- C5H5)(Cl)(TPPDS)2 en Medio Bifásico Orgánico/Agua

Artículo presentado en el XIX Simposio Iberoamericano de Catálisis. Septiembre 5-11, 2004. Mérida, Yucatán, MéxicoEn este trabajo se presentan los resultados de la hidrogenación de compuestos aromáticos como el tolueno, benceno y m-xileno en un sistema bifásico heptano/agua, utilizando como precursor catalítico el complejo Ru(η5-C5H5)(Cl)(TPPDS)2 (TPPDS = trifenilfosfinadisulfonada). Tanto el ligando como el complejo se sintetizaron y se caracterizaron por las técnicas espectroscópicas convencionales (RMN-1H, 13C, 31P, FTIR y SM). Los parámetros óptimos experimentales encontrados, utilizando tolueno como sustrato patrón, fueron: 105ºC, 1400 psi de hidrógeno, relación sustrato/catalizador 600:1 durante 4 horas de reacción. La conversión del tolueno aumenta con la temperatura, la presión de hidrógeno y con la fuerza iónica del medio. La variación del pH influye en la estabilidad de la especie activa para la catálisis ya que a pH 2 y 10 la velocidad de la reacción aumenta debido a la posible formación de partículas metálicas de rutenio. La prueba de la gota de mercurio muestra tendencia a inhibir la actividad catalítica del precursor para la hidrogenación bajo estas condiciones de trabajo. El precursor catalítico se reutilizó durante cuatro ciclos consecutivos sin perdida aparente de la actividad en presencia de un exceso de [email protected]@ula.ve, [email protected]@[email protected]@[email protected] this work the results obtained for hydrogenation of aromatic compounds like tolueno, benzene and m-xylene in a two-phase system heptane/water, using as catalytic precursor, the Ru(η5-C5H5)(Cl)(TPPDS)2 (TPPDS = triphenylphosphinedisulfonate) complex. The complex was synthesized and characterized by conventional spectroscopic techniques (RMN-1H, 13C, 31P, FTIR and MS). The experimental optimal parameters found, using toluene as reference substrate, were: 105ºC, 1400 psi of hydrogen, s/c relation 600:1 during 4 hours of reaction. Toluene conversion increases with temperature, hydrogen pressure and with ionic strength. pH variation influences the stability of the active species, at pH 2 and 10 the speed of the reaction increases due to possible metallic particle formation. The test of the drop of mercury shows a tendency to inhibit the catalytic hydrogenation activity under these reaction conditions. The catalytic precursor was reused during four consecutive cycles with little activity loss in the presence of excess ligand

Hydrogenation of aromatics with [Ru(g5-C5H5)Cl(TPPDS)2] in biphasic medium

[Ru(g5-C5H5)Cl(TPPDS)2], [TPPDS=P(C6H5)(C6H4SO3 ))2] in biphasic (n-heptane/water) medium hydrogenates toluene, benzene and m-xylene (105 C, 1400 psig H2, substrate/catalyst=600:1, 4 h) and in toluene hydrogenation gives methylcyclohexane. Catalytic activity increases with temperature, H2 pressure, ionic strength, and pH lower than 10. The catalytic water solution can be reused several times with little activity [email protected]@ula.ve, [email protected]@[email protected]@[email protected]

Synthesis, characterization and Hydroformylation Catalytic Activity of 1-hexene of Water-soluble RuCl2(DMSO)2(PySO3Na)2 Complex

En el presente trabajo describimos la síntesis y caracterización del nuevo complejo acuosoluble [Ru(Cl)2(DMSO)2(PySO3Na)2] donde [PySO3Na] es el ligando piridina p-sulfonato de sodio. Este complejo fue sintetizado por adición lenta del ligando a una solución metanólica del complejo cis-[Ru(Cl)2(DMSO)4] bajo reflujo y atmósfera inerte. Este nuevo complejo fue caracterizado utilizando las técnicas de FT-IR y RMNH1. El nuevo complejo mostró ser activo en la reacción catalitica de hidroformilación de 1-hexeno, sin embargo, no resultó ser muy activo en una prueba preliminar de hidroformilación catalítica con nafta real en medio bifásico. También se llevó a cabo la optimización de parámetros como tiempo, temperatura, presión y relación sustrato/catalizador usando 1-hexeno como sustrato. El sistema mostró pérdida de actividad durante las pruebas de reuso del catalizador, sin embargo mostró actividad en presencia de tiofeno y de mercurio metá[email protected] this work we describe the synthesis and characterization of a new water soluble ruthenium complex [Ru(Cl)2(DMSO)2(PySO3Na)2] (complex 1); where [PySO3Na] is the sodium salt of p-sulphonated pyridine. Complex 1 was obtained by slow addition of ligand to a cis-[Ru(Cl)2(DMSO)4] complex solution under inert atmosphere, the mixture was refluxed for 1 hour. Complex 1 was characterized by FT-IR and 1H NMR techniques. Complex 1 was active in the catalytic 1-hexene hydroformylation and a preliminary test with real naphtha in a biphasic reaction mixture (water/toluene) shows little activity. Temperature, pressure, and substrate/catalyst ratio were studied with 1-hexene substrate. Catalysis with metallic particles was tested with a mercury drop trial giving negative results. The reuse of the aqueous phase in several reactions under the same experimental conditions showed loss of catalytic activity after the second reuse. Complex 1 is active for hydroformylation reaction of 1-hexene even in the presence of thiophene compounds

Synthesis, characterization and hydroformylation catalytic activity of a water-soluble RhCl(CO)(PySO3Na)2 complex using 1-hexene and real naphtha

In this work, we describe the synthesis and characterization of a new water soluble [RhCl(CO)(PySO3Na)2], complex (1); where [PySO3Na] is the sodium salt of p-sulfonated pyridine ligand. Complex (1) was obtained in methanol, reacting the dried sodium salt of p-sulfonated pyridine ligand with [Rh(Cl)(CO)2]2 complex under inert atmosphere. Complex (1) was characterized by FT-IR and 1H NMR techniques. Complex (1) was active in the catalytic hydroformylation of 1-hexene and real naphtha in a biphasic (water/toluene) system. The effects of reaction time, temperature and syngas pressure were studied with 1-hexene as a substrate. Formation of metallic particles was tested with a mercury drop trial, giving negative results. Reuse of the aqueous phase for several times under the same conditions showed little catalytic activity loss. Complex (1) was active for the hydroformylation reaction of 1-hexene, in the presence of thiophene compounds, showing better performance in comparison with water soluble rhodium [email protected]@ula.ve, [email protected]@[email protected]@[email protected]

Hydrocarbon synthesis using Iron and Ruthenium/SiO2 with FISCHER-TROPSCH catalysis.

CONTENIDO Editorial.El nóbel de química 2007 y la "química superficial" en Venezuela. Imbert, Freddy E. Artículos Científicos Allylic oxidation of ent-Kaurenic acid, ent-Kaurenic acid Methyl Ester and ent-Kaurenol. Aparicio Z., Rosa L.; Bahsas B., Alí H. y Usubillaga, Alfredo Desarrollo de la tecnología de inmovilización: estabilización/solidificación de desechos peligrosos en Costa Rica.Estudio de caso en lodo de electrodeposición. Romero E., Luís G.; Vargas C., Maricruz y Padilla B., Francisco Hydrocarbon synthesis using Iron and Ruthenium/SiO2 with FISCHER-TROPSCH catalysis. Fonseca, Y. J.; Fontal, Bernardo; Reyes, Marisela del C.; Suárez B., Trino; Bellandi, F.; Contreras, Ricardo Rafael; Cancines, Pedro I.; Loaiza, A. y Briceño, M. Artículo Divulgativo Sistemas de producción agrícola sostenible en Los Andes de Venezuela: agricultura orgánica. López, Roberto A. y Contreras B., Froilán [email protected]@[email protected]@[email protected]@ula.veNivel analíticosemestra