Browsing by Author "201-0014881"
Now showing items 1-20 of 29
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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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Martínez Cifuentes, Maximiliano; Cardona, Wilson; Saitz Barría, Claudio; Weiss López, Boris; Araya Maturana, Ramiro (MDPI AG, 2017)A theoretical exploration about hydrogen bonding in a series of synthetic regioisomeric antitumor tricyclic hydroquinones is presented. The stabilization energy for the intramolecular hydrogen bond (IHB) formation in four ...
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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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Ruiz Fernández, A. R.; López Cascales, J. J.; Giner Casares, J. J.; Araya Maturana, Ramiro; Díaz Banose, F. G.; Weiss López, Boris (2016)Lyotropic nematic liquid crystals (lnlc) have attracted attention due to their resemblance to natural membranes and several technological applications. The effect of tetradecyltrimethyl ammonium chloride (TTAC) in the ...
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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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Martínez Cifuentes, Maximiliano; Salazar, Ricardo; Escobar, Carlos A.; Weiss López, Boris; Santos, Leonardo S.; Araya Maturana, Ramiro (Royal Soc Chemistry, 2015)In this work we present a study on the molecular structure and electrochemical behavior of a series of methoxylated 2'-hydroxychalcones, whose antitumor activity has been previously described. Cyclic voltammetry was used ...
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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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Bahamonde, Víctor; Ahumada, Hernán; Araya Maturana, Ramiro; Weiss López, Boris (CSIRO PUBLISHING, 2010)Ingestion of parathion produces catastrophic effects on mammals. Transformed into paraoxon, it inhibits acetylcholinesterase, producing acetylcholine accumulation. The distribution, orientation, and dynamics of parathion ...
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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; Cardona, Wilson; Cassels Niven, Bruce; Delgado Castro, Tomás; Ferrada Parker, Jorge; Miranda, Dante; Pavani, Mario; Pessoa Mahana, Hernán; Soto Delgado, Jorge; Weiss López, Boris (Elsevier Ltd., 2006-02-28)A series of tricyclic hydroquinones, incorporating a carbonyl group in the ortho position relative to the phenol function, were tested as inhibitors of oxygen uptake against the TA3 mouse carcinoma cell line and its ...
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Araya Maturana, Ramiro; Cardona, Wilson; Cassels Niven, Bruce; Delgado Castro, Tomás; Ferrada Parker, Jorge; Miranda, Dante; Pavani, Mario; Pessoa Mahana, Hernán; Soto Delgado, Jorge; Weiss López, Boris (Elsevier Ltd., 2006-02-28)Abstract—A series of tricyclic hydroquinones, incorporating a carbonyl group in the ortho position relative to the phenol function, were tested as inhibitors of oxygen uptake against the TA3 mouse carcinoma cell line and ...
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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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Martínez Cifuentes, Maximiliano; Salazar, Ricardo; Ramírez Rodríguez, Oney; Weiss López, Boris; Araya Maturana, Ramiro (MDPI AG, 2017)The rational design of quinones with specific redox properties is an issue of great interest because of their applications in pharmaceutical and material sciences. In this work, the electrochemical behavior of a series of ...
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Bravo, Hector R.; Ernesto Clavijo, Hector R.; Weiss López, Boris (Sociedad Chilena de Quimica, 2001)HOMO and LUMO energies from a 6-31G** full geometry optimization of a series of 7 cyclic hydroxamic acid derivatives were calculated. According to the LUMO energy, the molecules can be classified as hard electrophiles ...
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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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Weiss López, Boris; Gamboa, Consuelo; Tracey, Alan S. (1995)Deuterium quadrupole splittings from the aromatic ring of a series of deuterium labeled n-alkylpyridinium ions with linear n-alkyl groups from Ci to Cie have been measured using 2H-NMR spectroscopy. These splittings were ...