Now showing items 1-20 of 77349

    • Heredia Moya, Jorge; Krohn, Karsten; Florke, Ulrich; Araya Maturana, Ramiro (BLACKWELL PUBLISHING, 2006-09)
      (E)-Ethyl 3-(4-oxo-4H-chromen-3-yl)acrylate reacts in a Domino reaction with ethyl vinyl ether via intermediates to give the title bridged compound, C20H22O6, and by-products. The conformation of the carboxylate group in ...
    • Manríquez Castro, Víctor; Labbé, Cecilia; Castillo, Mariano; Wittke Günther, Oscar (MUNKSGAARD INT PUBL LTD., 1997-05-15)
      The structure of the title diterpene, C20H34O3 (8 alpha,13R-epoxylabd-14-ene-1 alpha,5 alpha-diol), exhibits a very uncommon oxidation pattern, with two axially disposed hydroxyl substituents at C1 and C5, and five tertiary ...
    • Riquelme Yáñez, Daniela de Lourdes (Universidad de Chile, 2011)
      En la actualidad, los medios se han expandido de forma meteórica. No sólo los tenemos de forma convencional, si no que se han abierto a distintos formatos. Esto, por el mismo empuje de la sociedad, las necesidades de ...
    • Cisneros Puebla, César A.; Alatorre, Francisco; Allen, Mitchell; Benard, Silvia; Castañeda, Dolores; Castañeda, Yvette; Charmaz, Kathy; Davidson, Judy; Amira de la Garza, Sarah; Espinoza Soto, Adriana; Faulkner, Sandra J.; Ferreyra, Gabriel; Gilgun, Jane; González Gutiérrez, Luis; Hein, Serge F.; Hernández, Hernández; Hesse Biber, Sharlene; Jara Labarthé, Vanessa; Johnson, John M.; Keller, Reiner; Lather, Patti; Tanya A. Long, Tanya A.; Pourreau, Leslie; Rawlins, William K.; Rinehart, Robert E.; Rubilar Donoso, Gabriela; Ryen, Anne; Soto Orozco, Miguel; Tamas, Sophie; Tilley Lubbs (SAGE, 2016)
    • Cerecetto, Hugo; González, M.; Risso, Mariela; Saenz, P.; Olea Azar, Claudio; Bruno, A. M.; Azqueta, Amaia; De Cerain, A. L.; Monge, A. (WILEY-V C H VERLAG GMBH, 2004-05)
      New 5-(2-arylethenyl)-1,2,4-triazine N-oxide and N,N'-dioxide derivatives were synthesized in order to obtain compounds as selective hypoxic cell cytotoxins. The desired products were obtained when the 5-methyl heterocycle ...
    • Moscoso Cabello, Raúl Andrés; Carbajo, J.; Squella Serrano, Juan (Elsevier Inc., 2014)
      One of the main challenges associated with the handling of carbon nanotubes (CNTs) for modifying electrodes is the production of adequate dispersions. We report the first example in which 1,3-dioxolane was used to produce ...
    • Bravo, Héctor R.; Copaja, Sylvia V.; Figueroa-Duarte, Sebastián; Lamborot, Madeleine; San Martín, Joxsé (Verlag der Zeitschrift fur Naturforschung, 2005)
      Secondary metabolites, DIBOA, HBOA, 7-OH-HBOA, BOA and gallic acid, were isolated and quantified from Calceolaria thyrsiflora Graham, a native medicinal plant of Chile belonging to the Scrophulariaceae family. The highest ...
    • Valenzuela, V.; Santander, P.; Camargo Grandón, Rodrigo; Squella Serrano, Juan; López Alarcón, Camilo; Núñez Vergara, Luis (TAYLOR & FRANCIS, 2004-07)
      In the present paper, a direct quenching of radical species by a number of synthesized nitrosoaryl 1,4-dihydropyridines and their parent nitroaryl 1,4-dihydropyridines was determined in aqueous media at pH 7.4. These two ...
    • Reyes Parada, Miguel; Scorza, Cecilia; Romero, Verónica; Silveira, Rodolfo; Medina, Jorge H.; Andrus, Danice; Nichols, David E.; Cassels Niven, Bruce (Springer, 1996-05-28)
      Serotonergic behavioral responses, efTects on motor activity and core temperature, and binding properties of the novel putative anxiolytic amphe!amine derivative (± )1-(2,5-dimethoxy-4-ethylthlophenyl)- 2-aminopropane ...
    • Reyes Parada, Miguel; Scorza, Cecilia; Romero, Veronica; Silveira, Rodolfo; Medina, Jorge H.; Andrus, Danice; Nichols, David E.; Cassels Niven, Bruce (Springer Verlag, 1996)
      Serotonergic behavioral responses, effects on motor activity and core temperature, and binding properties of the novel putative anxiolytic amphetamine derivative (±)1-(2,5-dimethoxy-4-ethylthiophenyl)-2-aminopropane ...
    • Boys Mardones, Daphne; Araya Maturana, Ramiro; Gonzáles Campos, Oscar Cesar; Manríquez Castro, Víctor (1995)
      The crystal structure of the title phosphonium salt consists of a tetrahedral (C6Hs)P +C(C4HS)- (COOCH2CH3) cation and a Br- anion. The triphenylphosphonium group has P---C(phenyl) distances which are equal within ...
    • Vásquez, David; Lagos González, Carlos F.; Mella Raipán, Jaime A.; González, Luis; Ebensperger González, Roberto; Alvarez Figueroa, M. Javiera; Sáez, Edmundo; Pessoa Mahana, Hernán; Araya Secchi, Raúl; González Wong, Angel; Pérez-Acle, Tomás; Pessoa, D. (SOC CHILENA QUIMICA, 2007-12)
      A novel approach to the development of anew class of HIV-1 RT inhibitors is reported. The 1-benzoyl-2-aryl-1H-benzimidazole series was designed as a combination of two previously reported active scaffolds, the benzimidazole ...
    • Iturriaga-Vásquez, Patricio; Zapata-Torres, Gerald; Rezende, Marcos Caroli; Cassels Niven, Bruce (2004)
      The conformational preferences of a series of 1-benzyl-1,2,3,4- tetrahydroisoquinolines (norlaudanosine and coclaurine analogues) were investigated with the aid of their 1H NMR spectra and NOESY experiments, coupled with ...
    • Iturriaga-Vásquez, Patricio; Zapata Torres, Gerald Amilcar; Caroli Rezende, Marcos; Cassels Niven, Bruce (SOCIEDAD CHILENA DE QUIMICA, 2004-03)
      The conformational preferences of a series of 1-benzyl-1,2,3,4-tetrahydroisoquinolines (norlaudanosine and coclaurine analogues) were investigated with the aid of their H-1 NMR spectra and NOESY experiments, coupled with ...
    • Alvarez Thon, Luis; Carrasco Altamirano, Héctor; Espinoza Catalán, Luis; Gallardo Araya, Claudio; Cardona, Wilson; Ibáñez, Andrés (BLACKWELL PUBLISHING, 2006-05)
      Molecules in the title crystal structure, C20H24O4, are linked into chains of R-4(4)(8) rings along [010] and these chains are linked into sheets via weak C-H center dot center dot center dot pi(arene) interactions. These ...
    • DePaola, Dominick; Howell, Howard; Baker, Charles G.; Boy-Lefevre, Marie Laure; Hull, Peter; Holmstrup, Palle; Jerolimov, Vjekoslav; Hardwick, Kevin; Lamster, Ira B.; Lopez, Nestor J.; Rifkin, Barry (2002)
      There has been significant concern that the dental curriculum and system of clinical education, in particular, is not designed to take advantage of the explosion in knowledge in biomedical science and its application to ...
    • Chinchón Barrera, Esteban Javier (Universidad de Chile, 2013-01)
      Este trabajo busca estudiar el valor agregado aportado por los analistas de las distintas AFP´s durante los primeros diez años de funcionamiento de los multifondos en Chile. Realizando una simulación de las inversiones de ...
    • Foerster González, Roelf; Montecino Aguirre, Sonia (Univ Tarapacá, 2016)
      En este artículo proponemos una nueva lectura de lo que se ha denominado “La rebelión de Angata”, un hecho que se produce en 1914 y que marcará la relación entre los rapanui y el mundo tire (Chile). El eje de nuestro ...
    • Pavez Reyes, María Isabel (Universidad de Chile, 2007-06)
      Al cumplirse 100 años del Parque J.D.Gómez Rojas, se argumenta las razones para su restauración en la perspectiva del Bicentenario de la Independencia de Chile
    • Lu, Yunxiang; Man, Weidong; Wang, Bo; Rosenkranz, Andreas; Yang, Mingyang; Yang, Ke; Yi, Jian; Song, Hui; Li, He; Jiang, Nan (Elsevier, 2020)
      In this study, amorphous carbon buffer layer containing nano-crystalline diamond grains was pre-deposited on single crystal silicon (Si) wafers. (100) oriented diamond films were prepared on the buffer layer by increasing ...