Now showing items 1-20 of 2715

    • 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 ...
    • 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 ...
    • 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 ...
    • 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 ...
    • Izquierdo, S.; Kogan Bocian, Marcelo; Parella, T.; Moglioni, A. G.; Branchadell, V.; Giralt, Ernest; Ortuño, R. M. (AMER CHEMICAL SOC, 2004-07-23)
      The efficient synthesis of tetrapeptide 5 containing, in alternation, cyclobutane and beta-alanine residues is described. NMR experiments both at low temperature in CDCl3 and at 298 K in DMSOd(6) solutions show the ...
    • Venegas Yazigi, Diego; Spodine Spiridonova, Evgenia; Saldias, Marianela; Vega, Andrés; Paredes García, Verónica; Calvo, Rafael; Santana, Ricardo Costa de (American Chemical Society, 2015)
      We report the crystal face indexing and molecular spatial orientation, magnetic properties, electron paramagnetic resonance (EPR) spectra, and density functional theory (DFT) calculations of two previously reported oxovanadium ...
    • Atria Salas, Ana María; Corsini, Gino; Talamilla, Arlyn; Garland, María Teresa; Baggio, Ricardo (BLACKWELL, 2008-12)
    • Wartini, Alexander R.; Valenzuela, Jorge; Staab, Heinz A.; Neugebauer, Franz A. (Wiley-VCH Verlag, 1998)
      Three types of tetrone radical anions in which two 1,4-benzoquinone units are connected by ethano (1·-, 2·-), [2.2]paracyclophane (3·-, 4·-), and anthracene bridges (5·-, 6·-) have been studied by ESR and ENDOR spectroscopy. ...
    • Donoso Tauda, Oscar; Escobar, Carlos A.; Araya Maturana, Ramiro; Vega, Andrés (BLACKWELL PUBLISHING, 2006-10)
      The molecule of the title compound, C19H20O2S, corresponds to a chiral sulfinyldienol with two stereogenic centres, viz. the C atom susbtituted by the hydroxy group and the sulfinyl S atom. The molecule displays a V-shape ...
    • 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 ...
    • Castañeda Magliona, Fernando; Aliaga Silva, Christian Marcelo; Bunton, Clifford A.; Garland, María Teresa; Baggio, Ricardo (BLACKWELL PUBLISHING, 2005-08)
      The title ylides, 3-(triphenylphosphoranylidene) pentane-2,4-dione, C23H21O2P, (I), and diethyl 2-(triphenylphosphoranylidene)malonate, C25H25O4P, (II), differ in the conformations adopted by their extended ylide moieties. ...
    • Erazo, Silvia; Galeffi, Corrado; Ciasca Rendina, M. A.; Delle Monache, E. M. (Istituto Superiore de Sanitá, 1971)
      (Quercetin-3-α-(2-0-β-D-glucopyranosyl)-D-glucofuraanoside, a new glycoside of Vestia lycioides). A new flavonol glycoside, the quercetin-3-α-(2-0-β-D-glucopyranosyl)-D-glucofuranoside, has been isolated from the leaves ...
    • Escobar, C. A.; Donoso Tauda, Oscar; Araya Maturana, Ramiro; Vega, Andrés (BLACKWELL PUBLISHING, 2007-07)
      The 1,5-benzodiazepine ring system exhibits a puckered boatlike conformation for all four title compounds [4-(2-hydroxyphenyl)2- phenyl-2,3-dihydro-1H-1,5-benzodiazepine, C21H18N2O, (I), 2-(2,3-dimethoxyphenyl)-4-(2-hydr ...
    • Vega, Andrés; Ramírez Rodríguez, Oney; Martínez Cifuentes, Maximiliano; Ibáñez, Andrés; Araya Maturana, Ramiro (WILEY-BLACKWELL PUBLISHING, INC, 2009-02)
      The title molecule, C14H14O3, contains two fused six-membered carbon rings with keto groups at positions 1, 4 and 5 and a gem-diethyl group at position 8. The molecule is close to planar (maximum deviation = 0.044 angstrom), ...
    • Ramírez Rodríguez, Oney; Martínez Cifuentes, Maximiliano; Ibáñez, A.; Vega, Andrés; Araya Maturana, Ramiro (BLACKWELL PUBLISHING, 2008-07)
      In the title molecule, C16H16O3, the ring system is planar and an intramolecular hydrogen bond is present. The molecular packing is dominated by an intermolecular hydrogen bond and by pi-stacking interactions [interplanar ...
    • Kattan, Eduardo; Takoudjou, Rodrigue; Venegas, Karen; Brousse, Julio; Delfino, Alejandro; López Barreda, R. (Springer New York LLC, 2019)
      Purpose: Safe perioperative care remains a large public healthcare problem in low- and middle-income countries. Anesthesia care provided by trained professionals is one of the essential determinants to address this situation. ...
    • Castañeda, Fernando; Silva, Paul; Garland, María Teresa; Shirazi, Ata; Bunton, Clifford A. (2009)
      The phosphonium ylidic diesters, methyl and ethyl isopropyl and, methyl and ethyl t-butyl triphenylphosphoranylidene malonates, 1a,b and 2a,b, respectively, have the syn-anti conformation in solution, as in the crystal, ...
    • Valenzuela, María Antonieta; Gamarra, Norma; Gómez, Luis; Kettlun, Ana María; Sardón, Marcia; Pérez, Luz María; Vinagre, Julia; Guzman, Norberto A. (1999)
      A comparative study of fish species identification was accomplished using three different electrophoretic techniques. Sarcoplasmic proteins were extracted from three related fish species and subjected to gel isoelectrofocusing ...
    • Tapia, Ricardo; López, Claudio; Morello Casté, Antonio; Maya Arango, Juan; Valderrama, Jaime (2005)
      The synthesis of a new class of angular tetracyclic quinones is described. Our strategy involves Diels-Alder reaction of pyrroloquinolinequinone 9, generated in situ from pyrroloquinoline 8, and dienes. The required ...