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Mostrando ítems 1-20 de 278

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    • 1,1-Diphenyl-4-(thiophen-2-yl)but-3-yn-1-ol 

      Umaña, Christian A.; Pineda Cedeño, Leslie William; Cabezas Pizarro, Jorge A. (2018-11)
      The asymmetric unit of the title homopropargyl alcohol, C20H16OS, contains two independent molecules comprising a hydroxy group, a 3-(2-thiophenyl)- propargylic moiety and two aromatic rings linked to a central carbon atom. ...
    • 1,3-Bis{[(2,6-di­methyl­phen­yl)sulfan­yl]meth­yl}benzene 

      Garita Salazar, Bruno; Pineda Cedeño, Leslie William (2019)
      The structure of the title compound, C24H26S2, an example of a pincer ligand with an SCS-chelation motif, illustrates the steric effects of the methyl groups in the thio­phenyl rings at the 2- and 6-positions, forcing a ...
    • 1-Nitro-4-(1-propyn-1-yl)benzene 

      Campos Fernández, Cristian Saúl; Pineda Cedeño, Leslie William; Cabezas Pizarro, Jorge A. (2019)
      The title compound, C9H7NO2, was prepared by alkynylation of 4-iodo­nitro­benzene with 1,3-dili­thio­propyne in the presence of 1 equivalent of CuI and catalytic amounts of Pd(PPh3)2Cl2. The complete mol­ecule is generated ...
    • (1S,3R)-N-{(3S,10S,12S,13R,17R)-12-Hydroxy-17- [(R)-5-hydroxypentan-2-yl]-10,13-dimethylhexa- decahydro-1H-cyclopenta[a]phenanthren-3-yl}- adamantane-1-carboxamide 0.25-hydrate 

      Campos Fernández, Cristian Saúl; Procúpez Schtirbu, Rolando; Soto Tellini, Victor Hugo; Salazar Camacho, Juan Carlos; Jancik, Vojtech (2022-10-12)
      The title compound, C 35H 57 NO 3 0.25H 2O, was synthesized from deoxycholic acid followed by a protection, a Mitsonobu substitution, a Staudinger reduction, formation of an amide and final reduction in the lateral chain. ...
    • A Chronoamperometric Screen Printed Carbon Biosensor Based on Alkaline Phosphatase Inhibition for W(VI) Determination in Water, Using 2-Phospho-l-Ascorbic Acid Trisodium Salt as a Substrate 

      Alvarado Gámez, Ana Lorena; Alonso Lomillo, María Asunción; Domínguez Renedo, Olga; Arcos Martínez, María Julia (2015)
      This paper presents a chronoamperometric method to determine tungsten in water using screen-printed carbon electrodes modified with gold nanoparticles and cross linked alkaline phosphatase immobilized in the working ...
    • A Metabolic Widget Adjusts the Phosphoenolpyruvate-Dependent Fructose Influx in Pseudomonas putida 

      Chavarría Vargas, Max; Goñi Moreno, Ángel; de Lorenzo, Víctor; Nikel Mayer, Pablo Iván (2016)
      Fructose uptake in the soil bacterium Pseudomonas putida occurs through a canonical phosphoenolpyruvate (PEP)-dependent sugar transport system (PTSFru). The logic of the genetic circuit that rules its functioning is puzzling: ...
    • A new method for the preparation of 1,3-dilithiopropyne: an efficient synthesis of homopropargyl alcohols 

      Cabezas Pizarro, Jorge A.; Pereira, Albán R. ; Amey, Adam R. (2001)
      Controlled dilithiation of propargyl bromide with two equivalents of n-butyllithium, in the presence of TMEDA, produces the operational equivalent of the dianion 1,3-dilithiopropyne. The latter reacts efficiently with ...
    • A New Method for the Preparation of 1,5-Diynes. Synthesis of (4E,6Z,10Z)-4,6,10-Hexadecatrien-1-ol, the Pheromone Component of the Cocoa Pod Borer Moth Conopomorpha cramerella 

      Pereira, Albán R.; Cabezas Pizarro, Jorge A. (2004)
      A new method for the synthesis of 1,5-diynes, from the reaction of 1,3-dilithiopropyne and propargyl chlorides, was developed. This new methodology was used to prepare (4E,6Z,10Z)-4,6,10-hexadecatrien-1-ol, one of the ...
    • A New Method for the Preparation of 1-Ethynyl Ethers 

      Cabezas Pizarro, Jorge A.; Oehlschlager, Allan Cameron (1994)
      During our study of the stannylcupration of acetylenic ethers we required [2-13C]-1 for mechanistic studies. Existing methods for the synthesis of acetylenic ethers involve dehydrohalogenation of 2-halo, ...
    • Aceptación de un jugo de mora endulzado con estevia en contraste con otros edulcorantes 

      González Torrivilla, César; Hernández Peñaranda, Alicia María; Cubero Castillo, Elba María (2017)
      El objetivo de la presente investigación fue desarrollar un jugo de mora (Rubus adenotrichus), endulzado con esteviolglucósidos (glucósidos obtenidos a partir de las hojas de Stevia rebaudina Bertoni) como una bebida ...
    • Adipostatins E-J, new potent antimicrobials identified as inhibitors of coenzyme-A biosynthesis 

      Gómez Rodríguez, Lyanne; Schultz, Pamela J.; Tamayo Castillo, Giselle; Dotson, Garry D.; Sherman, David H.; Tripathi, Ashootosh (2020-01)
      Phosphopantetheine is a key structural element in biological acyl transfer reactions found embedded within coenzyme A (CoA). Phosphopantothenoylcysteine synthetase (PPCS) is responsible for installing a cysteamine group ...
    • Aggregation Pheromone of Coconut Rhinoceros Beetle, Oryctes rhinoceros (L.) (Coleoptera: Scarabaeidae) 

      Hallett, Rebecca H.; Pérez Sánchez, Alice Lorena; Gries, Gerhard; Gries, Regine; Pierce Jr., Harold D.; Yue, Junming; Oehlschlager, Allan Cameron; González, Lilliana M.; Borden, John H. (1995-10)
      Male coconut rhinoceros beetles,Oryctes rhinoceros (L.), produce three sex-specific compounds, ethyl 4-methyloctanoate, ethyl 4-methylheptanoate, and 4-methyloctanoic acid, the first of which is an aggregation pheromone. ...
    • Aggregation Pheromone of Palm Weevil, Dynamis borassi 

      Peña, Jorge E.; Giblin Davis, Robin M.; Gries, Regine; Gries, Gerhard; Peña Rojas, E.; Pinzón, I.; Pérez Sánchez, Alice Lorena; Pierce Jr., Harold D.; Oehlschlager, Allan Cameron (1997)
      4-Methyl-5-nonanol (1) is the male-produced aggregation pheromone of the palm weevil, Dynamis borassi (F.) from Colombia. The pheromone was identified by coupled gas chromatographic–electroantennographic detection (GC-EAD) ...
    • Aggregation pheromone of palmetto weevil, Rhynchophorus cruentatus (F.) (Coleoptera: Curculionidae) 

      Weissling, Thomas J.; Giblin Davis, Robin M.; Gries, Gerhard; Gries, Regine; Pérez Sánchez, Alice Lorena; Pierce Jr., Harold D.; Oehlschlager, Allan Cameron (1994)
      5-Methyl-4-octanol is the major aggregation pheromone of the palmetto weevil,Rhynchophorus cruentatus (F.). The pheromone (cruentol) was identified by coupled gas chromatographic-electroantennographic (GC-EAD) analysis of ...
    • Aggregation Pheromone of the African Rhinoceros Beetle, Oryctes monoceros (Olivier) (Coleoptera: Scarabaeidae) 

      Gries, Gerhard; Gries, Regine; Pérez Sánchez, Alice Lorena; Oehlschlager, Allan Cameron; González, Lilliana M.; Pierce Jr., Harold D.; Zebeyou, Mesmer; Kouame, Brou (1994)
      Coleoptera, Oryctes monoceros, African Rhinoceros Beetle, Aggregation Pheromone, Ethyl 4-M ethyloctanoate Ethyl 4-m ethyloctanoate is a male-produced aggregation pheromone of the African rhinoc­eros beetle, Oryctes monoceros ...
    • Aggregation Pheromones and Host Kairomones of West Indian Sugarcane Weevil, Metamasius hemipterus sericeus 

      Campos, Y.; Chinchilla López, Carlos Manuel; Oehlschlager, Allan Cameron; Gries, Gerhard; Gries, Regine; Giblin Davis, Robin M.; Castrillo, Geovanny; Peña, Jorge E.; Duncan, R. E.; Gonzalez, L. M.; Pierce Jr., Harold D.; McDonald, R.; Andrade, R.; Pérez Sánchez, Alice Lorena (1997)
      Coupled gas chromatographic–electroantennographic detection (GC-EAD) analyses and coupled GC-mass spectrometry (MS) of volatiles produced by male and female West Indian sugarcane weevils (WISW), Metamasius hemipterus ...
    • Alkaloid contents in members of Lycopodiales 

      Tamayo Castillo, Giselle; Romero Chacón, Rosaura María; Rosales Ovares, Kattia; Jiménez Ardón, Allan Miguel; Jiménez Somarribas, Alberto; Montenegro, Héctor; Rodríguez Arrieta, Jesús Alexander; Vargas, Luis Diego (2001)
      The composition of alkaloids in fifteen species that belong to the Lycopodiales, which grow wild in Costa Rica were analysed by gas chromatography coupled with mass spectrometry. Several alkaloids were identified, ...
    • An improved stereospecific synthesis of (Z,E)-9, 11, 13-Tetradecatrienal. Sex pheromone component of Stenoma cecropia 

      Cabezas Pizarro, Jorge A.; Oehlschlager, Allan Cameron (2000)
      (Z,E)-9,11,13-tetradecatrienal, a pheromone component of Stenoma cecropia, was prepared in 61% overall yield from 1-nonyne. The synthesis involved two palladium-catalyzed cros-couplings to afford a 1,3-dien5-yne, which was ...
    • An Improved stereospecific synthesis of (Z,E)-tetradecadienal. Sex pheromone component of Stenoma cecropia 

      Cabezas Pizarro, Jorge A.; Oehlschlager, Allan Cameron (1998)
      (Z,E)-9, 11-Tetradecadienal, a sex pheromone component of Stenoma cecropia, has been synthesized in 7 steps and 61% overall yield. The synthesis utilized a palladium catalyzed coupling between 9-decynyl tert-butyldinethylsilyl ...
    • Analisis fotometrico por extraccion de bismuto con yoduro de tetrabutilamonio en solucion cloroformica 

      Lutz Cruz, Giselle (1980)

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