Relevant bibliographies by topics / Oxidación C-H

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  1. Journal articles
  2. Dissertations / Theses

Academic literature on the topic 'Oxidación C-H'

Author: Grafiati
Published: 4 June 2021
Last updated: 26 April 2022

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Journal articles on the topic "Oxidación C-H"

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Pacheco Coello, Franklin Jesús, Doralys Alessandra Ramírez Azuaje, Corymar Pastora Orosco Vargas, María Milagro Peraza Marrero, and Ibis Coromoto Pinto Catari. "Inhibición de la oxidación in vitro de lipoproteínas de baja densidad (LDL), por extractos acuosos de Camellia sinensis e Hibiscus sabdariffa." Ciencia y Salud 4, no. 3 (2020): 5–11. http://dx.doi.org/10.22206/cysa.2020.v4i3.pp5-11.

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Introducción: el uso de bebidas funcionales como las infusiones de Camellia sinensis e Hibiscus sabdariffa, ha crecido en los últimos años a nivel mundial gracias a su contenido en compuestos bioactivos con un alto poder antioxidante, atribuyéndoles diversos efectos entre los que destaca su capacidad hipolipemiente.
 Objetivo: el estudio tuvo como propósito evaluar la capacidad de dos extractos acuosos de C. sinensis e H. sabdariffa en la inhibición de la oxidación de las LDL obtenidas de plasma.
 Material y métodos: se emplearon hojas de té verde orgánico y cálices deshidratados par
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Rivera-Espinosa, L., G. Pérez-Guillé, JL Chávez-Pacheco, LM Torres-Espíndola, H. Juárez-Olguín, and R. Alemón-Medina. "Farmacocinética comparada de metformina, en forma sólida y en formulación extemporánea líquida para pediatría, en voluntarios adultos sanos." Acta Pediátrica de México 37, no. 4 (2016): 191. http://dx.doi.org/10.18233/apm37no4pp191-203.

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ANTECEDENTES: fraccionar o pulverizar tabletas de metformina para ajustar dosis pediátricas dificulta su administración, genera inestabilidad del fármaco (oxidación/fotosensibilidad) y relativiza su biodisponibilidad. Se propone como alternativa de ajuste de dosis y de uniformidad de contenido una formulación extemporánea líquida a partir de tabletas de marca comercial.OBJETIVO: determinar la biodisponibilidad de metformina en formulación líquida, en voluntarios adultos sanos, para demostrar que su comportamiento farmacocinético permanece inalterado.MATERIALES Y MÉTODOS: estudio clínico, aleat
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Alguacil, Francisco José, and Esther Escudero. "La eliminación de metales tóxicos presentes en efluentes líquidos mediante resinas de cambio iónico. Parte XII: Mercurio(II)/H+/Lewatit SP112." Revista de Metalurgia 56, no. 1 (2020): 160. http://dx.doi.org/10.3989/revmetalm.160.

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El mercurio(II) puede ser eliminado de disoluciones acuosas aci­das mediante la resina de intercambio catiónico Lewatit SP112. Se ha investigado la influencia de distintas variables experimentales sobre la carga del mercurio(II) en la resina: velocidad de agitación (275–1000 min−1), temperatura (20–60 °C), valor de pH del medio acuoso (0–4) y dosificación de la resina (0.05–0.4 g·L−1). La carga de mercurio(II) en la resina disminuye con el aumento de la temperatura (reacción exotérmica) en un proceso espontaneo, mientras que el modelo de núcleo recesivo representa al mecanismo de carga del met
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García Ahued, Maricela, Magali Santos Arista, Araceli Castañeda Ovando, et al. "Efecto del tiempo y tipo de materia prima en la oxidación de aceite de oleina de palma." PÄDI Boletín Científico de Ciencias Básicas e Ingenierías del ICBI 3, no. 6 (2016). http://dx.doi.org/10.29057/icbi.v3i6.569.

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En la industria de las botanas es importante la vida de anaquel porque los productos pueden sufrir oxidación química por el aceite absorbido, lo cual provoca defectos sensoriales. El objetivo del trabajo fue estudiar la oxidación en la oleína de palma utilizada para freír papa y pellets tipo donita a 180°C a lo largo del tiempo. Para ello se frieron 30 g de pellets y papa cada 15 min durante 2 h en 3 L de aceite, de los cuales se retiraron periódicamente muestras de 80 mL. Las pruebas para determinar la oxidación fueron los índices de acidez y de p-anisidina. El pellet presentó un aumento en e
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Vera, María Laura, Edgard Rubén Henrikson, Hernán Darío Traid, Alicia Esther Ares, and Marta Irene Litter. "Influencia de los tratamientos térmicos en recubrimientos anódicos nanotubulares de TiO2." Matéria (Rio de Janeiro) 23, no. 2 (2018). http://dx.doi.org/10.1590/s1517-707620180002.0460.

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RESUMEN El TiO2 es un semiconductor ampliamente utilizado en el proceso de fotocatálisis heterogénea para la descontaminación de aguas. Diversos estudios indican que las estructuras ordenadas de nanotubos en fase anatasa mejoran las propiedades fotocatalíticas del material con respecto a otras morfologías y estructuras de TiO2. El objetivo del presente trabajo es evaluar la influencia de diferentes tratamientos térmicos sobre la integridad y estructura cristalina de recubrimientos nanotubulares de TiO2 obtenidos mediante la técnica de oxidación anódica. Para la oxidación se utilizó como electr
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Dissertations / Theses on the topic "Oxidación C-H"

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Garcia, Bosch Isaac. "Managanese and dicopper complexes for bioinspired oxidation reactions: catalytic and mechanistic studies on C-H and C=C oxidations." Doctoral thesis, Universitat de Girona, 2011. http://hdl.handle.net/10803/78940.

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Enzymes are high-weight molecules which catalyze most of the metabolic processes in living organisms. Very often, these proteins contain one or more 1st row transition metal ions in their active center (Fe, Cu, Co, Mn, Zn, etc.), and are known as metalloenzymes or metalloproteins. Among these, metalloenzymes that activate molecular oxygen and use it as terminal oxidant stand out because of the wide range of catalyzed reactions and their exquisite selectivity. In this PhD dissertation we develop low-weight synthetic bioinspired complexes that can mimic structural and/or functional features of t
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Canta, i. Roldós Mercè. "Development of highly structured non-heme iron catalysts for selective C-H group oxidations." Doctoral thesis, Universitat de Girona, 2014. http://hdl.handle.net/10803/275978.

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Catalytic oxidation reactions of hydrocarbons that occur in the active site of metalloenzymes exhibit high efficiency and exquisite regio- and stereoselectivity under mild experimental conditions. We describe the efficient and selective oxidation of alkanes using a family of highly structured non-heme iron catalysts that introduce sterically bulky pinene groups. In this way, it is possible to modulate the selectivity, which depends on the combination of the chirality of the catalyst, the nature of the diamine backbone and the presence of a cavity-like site surrounding the metal center. We pres
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Dantignana, Valeria. "Bioinspired metal-based oxidants: selectivity in catalytic hydroxylation of aliphatic C-H bonds and insight into the reactivity of oxoiron species." Doctoral thesis, Universitat de Girona, 2020. http://hdl.handle.net/10803/671447.

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Selective oxidation of C-H bonds is an important reaction, as it can disclose novel synthetic strategies to get functionalized products through efficient paths. Nonetheless, due to the inert character of C-H bonds, the use of powerful oxidants is needed. In addition, achieving selectivity in such reactions is difficult. In that regard, nature can be taken as inspiration, since oxidation reactions are efficiently and selectively performed by iron-dependent oxygenases. Thus, in order to develop novel methodologies, bioinspired complexes have been explored as oxidation catalysts. In this line, in
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Borrell, Recasens Margarida. "Small-molecule mimics of rieske oxygenases. Application to selective aliphatic C-H hydroxylation and olefin syn-dihydroxylation." Doctoral thesis, Universitat de Girona, 2021. http://hdl.handle.net/10803/673107.

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Oxidations are an important kind of reactions which are traditionally performed using stoichiometric oxidants that generate a large amount of waste. Syn-dihydroxylation of alkenes is a paradigmatic example because it is a cornerstone reaction in organic synthesis that still relies in the use of heavy metal oxides, specially Os and Ru based oxides in catalytic amounts, but also KMnO4, in stoichiometric amounts. Acetonitrile and halogenated solvents are widely used solvents in these reactions because of their robust nature against oxidants. However, metal catalyzed oxidations in green solv
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Milan, Michela. "Oxidation of unactivated C-H bonds catalyzed by manganese complexes: control over site-selectivity and enantioselectivity." Doctoral thesis, Universitat de Girona, 2018. http://hdl.handle.net/10803/664865.

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The oxidation of aliphatic C-H bonds is a very powerful reaction because it allows the functionalization of inert C-H bonds, converting them into a suitable sites for further chemical elaboration. It also represents one of the most challenging reactions in modern synthetic organic chemistry because the multitude of aliphatic C-H bonds in a molecule makes site selective oxidation particularly difficult. Moreover, the introduction of chirality represents an unmet but very appealing challenge, because the asymmetric oxidation of hydrocarbons produces chiral compounds of high value in organic synt
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Corona, Prieto Teresa. "Understanding C-H oxidation and amination reactions performed by late first-row transition metals: trapping high-valent metal-O/N species." Doctoral thesis, Universitat de Girona, 2017. http://hdl.handle.net/10803/401684.

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The transformation of C-H bonds into C-O/N bonds is a process of interest in organic synthesis, but controlling the reactivity and selectivity among the multiple C-H bonds existing in most molecules is a challenging task. Traditional methodologies usually rely on the use of stoichiometric reagents that generate important amounts of toxic waste and relatively harsh reaction conditions are required. An alternative to these traditional methods is the use of catalysts, which enable the performance of these transformations under mild conditions, with improved selectivities and using less hazardous
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Prat, Casellas Irene. "Bioinspired non-heme iron catalysts for challenging oxidative transformations: mechanistic studies and catalytic applications on selective alkane hydroxylation and alkene cis-dihydroxilation." Doctoral thesis, Universitat de Girona, 2013. http://hdl.handle.net/10803/117778.

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The functionalization of hydrocarbons in a sustainable manner is one of the main challenges for chemists. Their abundance in nature as natural gas or crude oil makes them the most convenient chemical feedstock. The oxidation of hydrocarbons is one of the most interesting reactions, because the introduction of an oxygen atom introduces functionality in these molecules, increasing their value as reagents for further chemical transformation. However, these reactions are fundamentally difficult due to the low reactivity of alkyl C-H bonds. Current available methodologies involve highly reactive-ox
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Ruiz, Rodríguez Lidia. "Bronces de óxido de vanadio como catalizadores para la activación selectiva de enlaces C-H y S-H." Doctoral thesis, 2020. http://hdl.handle.net/10251/149488.

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[ES] En los últimos años, debido al aumento de la contaminación global y su impacto sobre el medio ambiente, se ha puesto especial énfasis en el desarrollo de nuevos procesos catalíticos respetuosos con el medioambiente. La síntesis de nuevos materiales, para su aplicación como catalizadores activos y selectivos en procesos de petroquímica y de eliminación de contaminantes, es uno de los campos de investigación más activo dentro del área de los procesos químicos. Entre los diferentes tipos de materiales, se ha puesto de manifiesto el interés en el desarrollo de catalizadores basados en
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