Browsing by Author "201-0014881"
Now showing items 1-17 of 17
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Araya Maturana, Ramiro; Heredia Moya, Jorge; Pessoa Mahana, Hernán; Weiss López, Boris; Muñoz, J. C. (BLACKWELL MUNKSGAARD, 2005-04)The title compound, C12H7NO3, consists of a chromone moiety substituted in position 3 with an acrylonitrile group in a Z configuration. The two planar groups are twisted with respect to one another. The only significant ...
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Ahumada, H.; Montecinos, R.; Martínez, R.; Araya Maturana, Ramiro; Weiss López, Boris (SOCIEDAD CHILENA DE QUIMICA, 2004-09)Deuterium quadrupole splittings, of deuterated water, Deltav, in anionic discotic nematic lyomesophases are always much larger than in cationic mesophases. To explore the possible origins of this difference, Deltav and T-1 ...
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Weiss López, Boris; Miño Galaz, Germán; Araya Maturana, Ramiro; Tracey, Alan S. (AMER CHEMICAL SOC, 2000-04-18)Deuterium quadrupole splittings of benzyl alcohol-d(5) and a series of alkyl benzyl-d(5), ethers, with linear aliphatic chains from 1 to 12 carbon atoms, were measured using H-2 NMR spectroscopy. These molecules were ...
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Weiss López, Boris; Saldaño Hurtado, Danilo; Araya Maturana, Ramiro; Gamboa, Consuelo (AMER CHEMICAL SOC, 1997-12-24)Deuterium quadrupole splittings from the aromatic ring of a series of linear benzyl-d(5) alkyl ethers, with alkyl chain length from 1 to 15 carbon atoms, have been measured using H-2-NMR spectroscopy. These molecules, 20% ...
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Ahumada, H.; Montecinos, R.; Alegría, S.; Araya Maturana, Ramiro; Weiss López, Boris (SOCIEDAD CHILENA DE QUIMICA, 2005-03)Molecular recognition based on chirality has fundamental importance in many biological processes. Deuterium quadrupole splittings from the aromatic ring and mesophase components of two series of optical isomers, L-and ...
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Weiss López, Boris; Jullian Matthaei, Carolina; Saitz Barría, Claudio; Pessoa Mahana, Hernán; Valderrama, J.; Araya Maturana, Ramiro (SOCIEDAD CHILENA DE QUIMICA, 2001-09)Activation parameters for the rotation around the methylene-nitrogen single bond found in a series of four 2,2'-disubstituted N-acetyl-N-phenylbenzylamines, dissolved in DMSO-d(6), were measured employing the temperature ...
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Counterion and composition effects on discotic nematic lyotropic liquid crystals - I. Size and order Montecinos, R.; Ahumada, H.; Araya Maturana, Ramiro; Olea, Andrés F.; Weiss López, Boris (ACADEMIC PRESS INC ELSEVIER SCIENCE, 2007-12-01)Counterion and composition effects on the size and interface dynamics of discotic nematic lyotropic liquid crystals made of tetradecyltrimethylammonium halide (TTAX)-decanol (DeOH)-water-NaX, with X = Cl- and Br-, were ...
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Weiss López, Boris; Azócar Rangel, Mauricio Alejandro; Montecinos, R.; Cassels Niven, Bruce; Araya Maturana, Ramiro (AMER CHEMICAL SOC, 2001-10-30)Deuterium quadrupole splittings from two series of optical isomers, L- and D-N-acyl-l-phenyl-d(5)-2-aminopropane, with linear acyl chains ranging from I to 10 carbon atoms, were measured using H-2 NMR spectroscopy. Both ...
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Araya Maturana, Ramiro; Heredia Moya, Jorge; Donoso Tauda, Oscar; Vera Castillo, Mario Francisco; Toledo Hernández, Jorge; Pavani, Mario; Pessoa Mahana, Hernán; Weiss López, Boris; Ferreira Parker, Jorge (NATURAL PRODUCTS INC, 2008)A set of structurally related compounds incorporating a chromone moiety as an essential component of their structures were tested against the TA3 mouse carcinoma cell line and its multidrug-resistant variant TA3-MTX-R. A ...
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Squella Serrano, Juan; Sturm Schaub, Juan; Weiss López, Boris; Bontá, M.; Núñez Vergara, Luis (ELSEVIER SCIENCE, 1999-05-14)The electrochemical reduction of a series of beta-nitrostyrene and beta-methyl-beta-nitrostyrene derivatives: by tast and differential pulse polarography and cyclic voltammetry over a wide pH range was studied. The reduction ...
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Araya Maturana, Ramiro; Heredia Moya, Jorge; Pessoa Mahana, Hernán; Weiss López, Boris (MARCEL DEKKER INC, 2003)Treatment of formylchromones, dissolved in 2-propanol with basic alumina at 75degreesC, selectively reduces the formyl group with good yields without any activation process of the alumina.
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Araya Maturana, Ramiro; Gavin Sazatornil, J. A.; Heredia Moya, Jorge; Pessoa Mahana, Hernán; Weiss López, Boris (SOC BRASILEIRA QUIMICA, 2005-05)A systematic study about the long-range correlations observed in the HMBC spectra of a series of cis and trans 3-(4-oxo-4H-chromen-3-yl)-acrylic acid ethyl esters, and 5-hydroxy derivatives, was carried out. The results ...
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Martínez Cifuentes, Maximiliano; Clavijo Allancan, Graciela; Zúñiga Hormazábal, Pamela; Aranda Zapata, Braulio Sebastián; Barriga, Andrés; Weiss López, Boris; Araya Maturana, Ramiro (MDPI AG, 2016)A series of a new type of tetracyclic carbazolequinones incorporating a carbonyl group at the ortho position relative to the quinone moiety was synthesized and analyzed by tandem electrospray ionization mass spectrometry ...
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Araya Maturana, Ramiro; Cassels Niven, Bruce; Delgado Castro, Tomás; Valderrama Guerrero, Jaime Adolfo; Weiss López, Boris (PERGAMON-ELSEVIER SCIENCE LTD, 1999-01-15)The Diels-Alder reactions of 8,8-dimethylnaphtalene-1,4,5(8H)-trione with 2,4-hexadien-1-ol and its O-acetyl derivative were investigated in different solvents. The regiochemistry of the cycloaddition of the hexadienol was ...
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Montecinos, R.; Ahumada, H.; Martínez, R.; Olea Carrasco, Floreal; Araya Maturana, Ramiro; Aliste, M. P.; Tieleman, D. P.; Weiss López, Boris (AMER CHEMICAL SOC, 2004-07-06)The structure and aggregation number of a discotic lyotropic liquid crystal, prepared from tetradecyltrimethylammonium chloride (TDTMACI)/decanol (DeOH)/NaCI/H2O, have been examined using fluorescence quenching of pyrene ...
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Araya Maturana, Ramiro; Delgado Castro, Tomás; Cardona, Wilson; Weiss López, Boris (BENTHAM SCIENCE PUBL LTD, 2001-03)The structural elucidation of complex organic molecules relies heavily on the application of proton detected heteronuclear NMR. Among these techniques, the HMBC NMR experiment is probably the most useful 2D NMR method The ...
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Araya Maturana, Ramiro; Pessoa Mahana, Hernán; Weiss López, Boris (NATURAL PRODUCTS INC, 2008)The structural elucidation of natural products and complex organic molecules relies heavily on the application of proton detected heteronuclear NMR. Among these techniques, the HMBC NMR experiment remains as the most popular ...