Výsledky vyhledávání - "Regina Vallejo"

Kinetics and mechanisms of homogeneous catalytic reactions: Part 13. Regioselective reduction of quinoline catalysed by Rh(acac)(CO)[P(tBu)(CH2CH=CH2)2]

Autor: Karely Molina, Regina Vallejo, Merlin Rosales, Edgar Ocando-Mavarez

Publikováno v: Transition Metal Chemistry. 41:467-473

The complex Rh(acac)(CO)[P(tBu)(CH2CH=CH2)2] (1) proved to be an efficient precatalyst for the regioselective hydrogenation of quinoline (Q) to 1,2,3,4-tetrahydroquinoline (THQ) under mild reaction conditions (125 °C and 4 atm H2). A kinetic study o

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https://doi.org/10.1007/s11243-016-0042-7

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Kinetics and Mechanisms of Homogeneous Catalytic Reactions. Part 10. Regioselective Hydrogenation of Quinoline Catalyzed by the Systems M2Cl2(COE)4/2 Triphos [M = Rh, Ir; COE = Cyclooctene; Triphos = 1,1,1-Tris(diphenylphosphinomethyl)Ethane]

Autor: Merlin Rosales, Karely Molina, Regina Vallejo, Pablo J. Baricelli, Juan José Soto, Luis Jhonathan Bastidas

Publikováno v: Catalysis Letters. 134:56-62

The systems prepared in situ by addition of two equivalents of 1,1,1-tris(diphenylphosphinomethyl)ethane (triphos) to M2Cl2(COE)4 (M = Rh, Ir; COE = cyclooctene) showed to be efficient and regioselective precatalysts for the hydrogenation of quinolin

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https://doi.org/10.1007/s10562-009-0225-3

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Hydrogenation of heteroaromatic nitrogen compounds catalyzed by rhodium and iridium systems containing diphosphine ligands

Autor: Angel González, Merlin Rosales, Luis Jhonatan Bastidas, Regina Vallejo, Beatriz González

Publikováno v: Reaction Kinetics and Catalysis Letters. 92:99-104

The systems prepared in situ by addition of two equivalents of diphosphine [1,2-bis(diphenylphosphino)ethane (dppe), 1,3-bis(diphenylphosphino)propane (dppp) and 1,4-bis(diphenylphosphino)butane (dppb)] to M2Cl2(COE)4 (M = Rh, Ir; COE = cyclooctene)

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https://doi.org/10.1007/s11144-007-5150-0

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Regioselective Reduction of Quinolines Catalyzed by Rhodium and Iridium Complexes with mono-, di-, and tri-dentated Phosphine Ligands

Autor: Regina Vallejo, Angel González, Merlin Rosales, Juan José Soto, Gustavo Chacón, Beatriz González

Publikováno v: Catalysis Letters. 106:101-105

The systems prepared in situ by addition of the corresponding equivalents of the respective phosphine (mono-, di- and tri-dentated), called M2Cl2(COE)4/n phosphine (M = Rh, Ir; and COE = cyclooctene), are efficient and regioselective precatalysts for

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https://doi.org/10.1007/s10562-005-9614-4

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Determination of chemical properties of pyrolysis products from coals by diffuse-reflectance infrared spectroscopy and partial least squares

Autor: Carlos Alciaturi, Marcos Escobar, Regina Vallejo, Carlos De La Cruz

Publikováno v: Analytica Chimica Acta. 436:265-272

Typical coal samples from Venezuela were pyrolysed in nitrogen atmosphere at temperatures between 150 and 900°C. Structural changes were monitored by diffuse-reflectance infrared Fourier transform spectroscopy, i.e. DRIFTS. Segmented osculating poly

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https://doi.org/10.1016/s0003-2670(01)00947-3

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Prediction of coal properties by derivative DRIFT spectroscopy

Autor: Marcos Escobar, Carlos Alciaturi, Regina Vallejo

Publikováno v: Fuel. 75:491-499

Diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy was evaluated as a method for the determination of volatile matter, fixed carbon, ash, heating value, carbon, hydrogen, nitrogen, total sulfur and maximum vitrinite reflectance. Fift

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https://doi.org/10.1016/0016-2361(95)00246-4

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ESTUDIO TEORICO DE LA POLARIZABILIDAD MOLECULAR EN TRIAFULVENO Y COMPUESTOS ANALOGOS

Autor: Regina Vallejo, Néstor Cubillán, Heverest Soscun, Eudo Osorio, Humberto Soscún, Ysaias Alvarado

Publikováno v: Boletín de la Sociedad Chilena de Química v.45 n.3 2000
SciELO Chile
CONICYT Chile
instacron:CONICYT
Boletín de la Sociedad Chilena de Química, Volume: 45, Issue: 3, Pages: 339-346, Published: SEP 2000

El triafulveno H2C3-CH2 es el compuesto más simple que presenta conjugación cruzada no alternante. En el presente trabajo se expone un estudio teórico Ab Initio a nivel Hartree-Fock (HF) de la polarizabilidad molecular de triafulveno y análogos d

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http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0366-16442000000300002

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