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Dissertations / Theses on the topic 'Biomimetic oxidation'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Tran, Lien-Hoa. "Biomimetic Reactions : Water Oxidation and Aerobic Oxidation." Doctoral thesis, Stockholm : Department of Organic Chemistry, Stockholm University, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-26259.

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2

Grant, D. "Synthetic approaches to biomimetic iron-centred oxidation." Thesis, Queen's University Belfast, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.546349.

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3

Sehlotho, Nthapo. "Phthalocyanines : photochemical, electrochemical and biomimetic catalytic behaviour." Thesis, Rhodes University, 2007. http://hdl.handle.net/10962/d1004997.

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This thesis explored use of metallophthalocyanines as electrocatalysts towards thiol and thiocyanate oxidation, nitrosothiol decomposition and reduction of oxygen, as well as biomimetic and photo-catalysts of cyclohexene oxidation. 2-mercaptoethanol (2-ME), L-cysteine (CYS) and reduced glutathione (GSH) thiols were oxidized on cobalt tetra ethoxythiophene and cobalt tetra phenoxy pyrrole phthalocyanine modified glassy carbon electrodes, whose catalytic activity was found to depend on pH, film thickness and method of electrode modification. Oxidation of thiocyanate (SCN-), CYS and 2-ME was cata

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4

Harden, Grahame James. "Some synthetic and mechanistic studies relating to biomimetic oxidation." Thesis, University of Surrey, 1990. http://epubs.surrey.ac.uk/843036/.

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This thesis is largely concerned with the study of a cytochrome P-450 enzyme mimic consisting of an Iron porphyrin and iodosylbenzene. Chapter 1 consists of a review of the work that has been published on the above and other related metalloporphyrin biomimetic systems. The contents bear witness to the relatively recent interest in these particular enzyme mimics. A kinetic investigation forms the substance of the second chapter. The effect of structural and electronic changes on the iron porphyrin catalyst and the iodosylbenzene oxidant are measured in terms of their effect on the rate of cyclo

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5

Broadbridge, Simon Glenn. "A biomimetic approach to water-borne surface coatings." Thesis, University of Southampton, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243175.

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6

Karlsson, Erik. "Catalysts for Oxygen Production and Utilization : Closing the Oxygen Cycle: From Biomimetic Oxidation to Artificial Photosynthesis." Doctoral thesis, Stockholms universitet, Institutionen för organisk kemi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-56917.

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This thesis describes the development and study of catalysts for redox reactions, which either utilize oxygen or hydrogen peroxide for the purpose of selectively oxidizing organic substrates, or produce oxygen as the necessary byproduct in the production of hydrogen by artificial photosynthesis. The first chapter gives a general introduction about the use of environmentally friendly oxidants in the field of organic synthesis, and about the field of artificial photosynthesis. The second chapter describes a computational study of the mechanism of palladium-catalyzed oxidative carbohydroxylation

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7

Mutsvairo, Tafadzwa. "Isolation, characterization and biomimetic oxidation of selected marine natural products and their analogues." Thesis, Rhodes University, 2016. http://hdl.handle.net/10962/64685.

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Marine brown algae produce a variety of terpenes with a wide range of biological activities. However, very few phytochemical studies of brown algae have been conducted in South Africa. Therefore, in our continued search for biologically active natural products, we examined the South African brown alga Brassicophycus brassicaeformis. The dichloromethane-methanol extract of B.brassicaeformis was fractionated by silica gel column chromatography followed by normal phase HPLC to give pure four pure compounds which were identified by spectroscopic methods as; fucosterol, fucoxanthin and two monogala

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8

Chipiso, Kudzanai. "Biomimetic Tools in Oxidative Metabolism: Characterization of Reactive Metabolites from Antithyroid Drugs." PDXScholar, 2016. http://pdxscholar.library.pdx.edu/open_access_etds/3083.

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Toxicities of sulfur-based drugs have been attributed to formation of highly reactive sulfur oxo-acids and depletion of glutathione by the formation of reactive metabolites. Metabolic activation of these sulfur centers to conceivably toxic reactive metabolites (RMs) that can covalently modify proteins is considered the initial step in drug-induced toxicity. Despite considerable effort and research, detection and characterization of these RMs during drug development and therapy remains a challenge. Methimazole (MMI) and 6-propyl-2-thiouracil (PTU) are two commonly used antithyroid, sulfur-based

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9

Yam, Fei. "Poly-fluorinated metallo-corroles as biomimetic catalyst for epoxidation and H₂O₂-dismutation /." View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?CHEM%202004%20YAM.

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10

Djerdjouri, Nour-Eddine. "Hydrogen peroxide delignification in a biomimetic system based on manganese peroxidase." Diss., Available online, Georgia Institute of Technology, 2005, 2003. http://etd.gatech.edu/theses/available/ipstetd-1017/.

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11

Lindén, Auri. "Flavins as Biomimetic Catalysts for Sulfoxidation by H2O2 : Catalyst Immobilization in Ionic Liquid for H2O2 Oxidations." Doctoral thesis, Stockholms universitet, Institutionen för organisk kemi, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-623.

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This thesis deals with the development of catalytic oxidation reactions utilizing hydrogen peroxide as terminal oxidant. The main focus has been to find flavin catalysts that are easy to handle and stable to store but still able to perform the desired reaction. A variety of dihydroflavins were prepared and the electrochemical oxidation potentials were measured and compared with their catalytic activity. A flavin catalyst was applied in the sulfoxidation of allylic and vinylic sulfides by H2O2. This transformation was highly chemoselective and the sulfoxides were obtained without formation of o

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12

CHIODI, DEBORA. "Oxo-rhenium-catalyzed Biomimetic Cyclizations and Late-stage Electrochemical C–H Oxidation of Unactivated C(sp3)–H Bonds." Doctoral thesis, Università degli studi di Pavia, 2022. http://hdl.handle.net/11571/1450084.

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Part A: Oxo-rhenium-catalyzed Biomimetic Cyclization Biomimetic cyclizations are remarkable tools because a significant increase in molecular complexity can be obtained in a single step. In the first part of my PhD, a new method to promote biomimetic cyclizations of terpenoid-like starting materials using an oxo-rhenium complex as a catalyst is described. This proof of concept, if further explored, will give access to useful building blocks that can be employed for the total synthesis of natural products. Part B: Electrochemical C–H Oxidation The site-specific oxidation of “strong”, non-acidic

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13

Liljeblad, Jonathan F. D. "Biomimetic Membranes: : Molecular Structure and Stability Studies by Vibrational Sum Frequency Spectroscopy." Licentiate thesis, KTH, Surface and Corrosion Science, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-24465.

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<p>In the research presented in this licentiate thesis the surface specific technique Vibrational Sum Frequency Spectroscopy, VSFS, combined with the Langmuir trough has been utilized to investigate Langmuir monolayers and Langmuir-Blodgett (LB) deposited mono- and bilayers of phospholipids. Their molecular structure, stability, and hydration were probed to gain additional understanding of important properties aiming at facilitating the use of such layers as model systems for biological membranes.</p><p>VSFS was applied to <em>in situ</em> studies of the degradation of Langmuir monolayers of 1

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14

Lindén, Auri. "Flavins as Biomimetic Catalysts for Sulfoxidation by H₂O₂ : Catalyst Immobilization in Ionic Liquid for H₂O₂ Oxidations." Doctoral thesis, Stockholm University, Department of Organic Chemistry, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-623.

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<p>This thesis deals with the development of catalytic oxidation reactions utilizing hydrogen peroxide as terminal oxidant. The main focus has been to find flavin catalysts that are easy to handle and stable to store but still able to perform the desired reaction. A variety of dihydroflavins were prepared and the electrochemical oxidation potentials were measured and compared with their catalytic activity.</p><p>A flavin catalyst was applied in the sulfoxidation of allylic and vinylic sulfides by H<sub>2</sub>O<sub>2</sub>. This transformation was highly chemoselective and the sulfoxides were

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15

Kwong, Ka Wai. "Visible-Light Generation of High-Valent Metal-Oxo Intermediates and a Biomimetic Oxidation Catalyzed By Manganese Porphyrins with Iodobenzene Diacetate." TopSCHOLAR®, 2016. http://digitalcommons.wku.edu/theses/1743.

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High-valent iron-oxo intermediates play central roles as active oxidants in enzymatic and synthetic catalytic oxidations. Many transition metal catalysts are designed for biomimetic studies of the predominant oxidation catalysts in Nature, the cytochrome P450 enzymes. In this work, a new photochemical method to generate high-valent iron-oxo porphyrin models was discovered. As controlled by the electronic nature of porphyrin ligands, iron(IV)-oxo porphyrin radical cations (Compound I model) and iron(IV)-oxo porphyrin derivatives (Compound II model) were produced. These observations indicate tha

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16

Wiechen, Mathias [Verfasser]. "Mixed Manganese Oxides as Biomimetic Water-Oxidation Catalysts - promising Materials for the Production of Solar Fuels by Artificial Photosynthesis / Mathias Wiechen." Kiel : Universitätsbibliothek Kiel, 2013. http://d-nb.info/1036242900/34.

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17

Patel, Dharmesh J. "Biomimetic Studies of Oxidation Reactions by Metalloporphyrins through Ligand Effect and Kinetic Studies of Photo-Generated Porphyrin-Iron(Iv)- Oxocompound II Models." TopSCHOLAR®, 2018. https://digitalcommons.wku.edu/theses/2091.

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High-valent iron(IV)-oxo porphyrins are the central oxidizing species in hemecontaining enzymes and synthetic oxidation catalysts. Many transition metal complexes have been extensively studied as models of the ubiquitous cytochrome P450 enzymes to probe the sophisticated oxygen atom transfer (OAT) mechanism as well as to invent enzyme-like oxidation catalysts. In this work, two metalloporphyrin complexes have been successfully synthesized, and spectroscopically characterized. A new photochemical entry to porphyrin-iron(IV)-oxo derivatives, commonly referred to as compound II models, was also i

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18

Schaab, Estela Hanauer. "Estudos oxidativos biomiméticos com os produtos naturais piperina e piplartina." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/60/60138/tde-15092008-143033/.

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A piperina e a piplartina são alcalóides isolados de espécies do gênero Piper. A escolha destas moléculas para este estudo foi baseada em suas atividades biológicas, em especial pelo seu potencial antitumoral. Tendo em vista a procura de meios alternativos para o estudo do metabolismo de novos fármacos, especialmente aqueles provenientes de produtos naturais, este trabalho teve como objetivo avaliar o perfil oxidativo da piperina e da piplartina através de diferentes metaloporfirinas, que biomimetizam o metabolismo do citocromo P450. Para a realização deste trabalho, a piperina e a piplartina

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19

Malone, Jonathan. "Photochemical Investigation of High-Valent Metal-Oxo Intermediates Containing Corrole and Light-Harvesting Porphyrin Ligands." TopSCHOLAR®, 2018. https://digitalcommons.wku.edu/theses/3058.

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In enzymatic and synthetic catalytic oxidations, high-valent iron-oxo intermediates play a vital role as the active oxidant. In this regard, many synthetic metal catalysts are designed as biomimetic models to resemble the active site of Cytochrome P450 enzymes (P450) which are the predominant oxidation catalysts in nature. Vitamin B12 cofactors, with a corrole-like structure corrin, are also utilized in some of the more difficult reactions in nature such as rearrangement and reductase reactions. In this work, application of the promising photochemical method to corrolecontaining ligands system

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20

Persson, Andreas K. Å. "Palladium(II)-Catalyzed Oxidative Cyclization Strategies : Selective Formation of New C-C and C-N Bonds." Doctoral thesis, Stockholms universitet, Institutionen för organisk kemi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-75435.

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The main focus of this thesis has been directed towards preparation and oxidative carbocyclization of en-, dien- and aza-enallenes. In the first part of this thesis, a stereoselective oxidative carbocyclization of dienallenes was realized. By employing cheap and readily available palladium trifluoroacetate we were able to efficiently cyclize a variety of dienallenes into hydroxylated carbocycles in high yield and high selectivity. This oxidative process was compatible with two different reoxidation protocols: one relying on p-benzoquinone (BQ) as the oxidant and the other employing molecular o

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21

Cuzan, Olesea. "Synthesis and characterization of new transition metal complexes for catalytic oxidation and electrolytic proton reduction." Thesis, Aix-Marseille, 2016. http://www.theses.fr/2016AIXM4356/document.

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De nos jours, la capacité à synthétiser de nouveaux catalyseurs métallique bioinspirés pour améliorer et élargir le spectre d'activité catalytique est d’une importance capitale pour une chimie respectueuse de notre environnement.Cette thèse se concentre sur la conception de nouveaux complexes de métaux de transition (cuivre et palladium) basés sur deux classes différentes de ligands organiques : les benzotriazolyle-phénolates et les phosphonates. La synthèse et la caractérisation de nouveaux composés a été réalisée par différentes méthodes physico-chimiques (électrochimie, EPR, UV-vis, IR, cri

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22

Leod, Tatiana Cristina de Oliveira Mac. "Metaloporfirinas e compostos salen como modelos biomiméticos do citocromo P450 no metabolismo de fármacos anticonvulsivante e antidepressivo." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/59/59138/tde-21052009-113014/.

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Neste trabalho foram estudadas a atividade catalítica de metaloporfirinas e complexos salen (catalisador de Jacobsen), em solução e imobilizados em diferentes suportes, na oxidação de hidrocarbonetos e fármacos anticonvulsivantes (carbamazepina e primidona) e antidepressivo (fluoxetina), utilizando os seguintes doadores de oxigênio: peróxido de hidrogênio, terc-butil hidroperóxido (t-BOOH), ácido m-cloroperbenzóico (m-CPBA) e iodosilbenzeno (PhIO). Os catalisadores contendo o complexo salen imobilizado em alumina, membranas de quitosana e membranas polidimetilssiloxano/acetato de polivinila (P

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23

Ranburger, Davis Ray. "Visible Light Generation of High-Valent Corrole-Manganese(V)-Oxo Intermediates and Biomimetic Studies of the Oxidation of Organic Sulfides Catalyzed by Manganese Corroles with Iodobenzene Diacetate." TopSCHOLAR®, 2018. https://digitalcommons.wku.edu/theses/3053.

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High-valent transition metal-oxo intermediates play essential roles as active oxidizing species in enzymatic and biomimetic catalytic systems. Extensive research has been conducted on a variety of transition metal catalysts being studied as models for the ubiquitous cytochrome P450 enzymes. In doing so, the production of enzyme-like oxidation catalysts and probing studies on the sophisticated oxygen atom transfer mechanism are taking place. In this work, visible-light irradiation of highly-photo-labile corrole-manganese(IV) bromates and chlorates was studied in two corrole systems with differi

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24

Zanardi, Fabrício Bortulucci. "Manganêsporfirina imobilizada em compósito magnético Fe3O4@nSiO2@MCM-41: catalisador biomimético aplicado na oxidação de hidrocarbonetos e fármaco." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/59/59138/tde-10082015-143133/.

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Este estudo relata a síntese dos catalisadores heterogêneos Fe3O4@nSiO2@MCM-41-MnP e Fe3O4@nSiO2@MCM-41(E)-MnP. São sistemas que aliam as propriedades catalíticas de metaloporfirinas, com as propriedades magnéticas das nanopartículas de magnetita (Fe3O4) numa matriz estruturada de sílica mesoporosa MCM-41. A síntese das nanopartículas de Fe3O4 foi seguida pelo revestimento de sua superfície com camada fina de sílica (Fe3O4@nSiO2). Em seguida, a estrutura mesoporosa da sílica MCM-41 foi formada sobre as partículas recobertas na presença de brometo de hexadeciltrimetilamônio, como

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25

Cuzan, Olesea. "Synthesis and characterization of new transition metal complexes for catalytic oxidation and electrolytic proton reduction." Electronic Thesis or Diss., Aix-Marseille, 2016. http://www.theses.fr/2016AIXM4356.

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De nos jours, la capacité à synthétiser de nouveaux catalyseurs métallique bioinspirés pour améliorer et élargir le spectre d'activité catalytique est d’une importance capitale pour une chimie respectueuse de notre environnement.Cette thèse se concentre sur la conception de nouveaux complexes de métaux de transition (cuivre et palladium) basés sur deux classes différentes de ligands organiques : les benzotriazolyle-phénolates et les phosphonates. La synthèse et la caractérisation de nouveaux composés a été réalisée par différentes méthodes physico-chimiques (électrochimie, EPR, UV-vis, IR, cri

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26

Zanatta, Lucas Dimarô. "Síntese e caracterização de metaloporfirinas imobilizadas em SBA-15 como catalisadores biomiméticos na oxidação de hidrocarbonetos." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/59/59138/tde-07052014-162430/.

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As metaloporfirinas (MeP) cloreto de 5,10,15,20-tetra(pentafluorofenill)porfirina de manganês (III) e ferro (III) (MnIIIP e FeIIIP) foram imobilizadas em matriz de sílica híbrida mesoporosa do tipo SBA-15. Os grupos silanóis da SBA-15 foram modificados com (3-aminopropil)trietoxissilano (APTES) e (3-aminopropil)dietoximetilsilano (APDES), que após a imobilização das metaloporfirinas geraram os catalisadores FeP-APSBA, FeP-APMSBA, MnP-APSBA e MnP-APMSBA. Um terceiro tipo de material foi preparado a partir da ligação de grupos trimetilsilil (TMS) nos catalisadores FeP-APSBA e MnP-APSBA, gerando

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27

Sperry, Jonathan. "Biomimetic oxidations in natural product synthesis." Thesis, University of Exeter, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.425500.

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28

O'Connell, Keith. "Biomimetic oxidations using an iron porphyrin catalyst." Thesis, University of Surrey, 1998. http://epubs.surrey.ac.uk/844067/.

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The oxidation of certain 2-alkyl-3-hydroxynaphtho-1,4-quinones, pyrimidines and nucleosides by hydrogen peroxide, catalysed by 5,10,15,20-tetrakis(pentafluorophenyl)porphine iron(ni) chloride is investigated. This catalyst is particularly efficient in the oxidation of the hydroxynaphthoquinones; a proposed epoxide product which was not isolated reacts further to give low yields of a dehydro dimer and an oxoindane carboxylate, which are fully characterised. The mechanisms of formation of these secondary products from the primary epoxide product are discussed. Oxidation of certain pyrimidines an

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29

Cecchini, Chiara. "Late Transition Metal-Oxo complexes: Synthesis, and Biorelevant Reactivity." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/11249/.

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High-valent terminal metal-oxygen adducts are supposed to be potent oxidising intermediates in enzymatic catalyses. In contrast to those from groups 6-8, oxidants that contain late transition metals (Co, Ni, Cu) are poorly understood. Because of their high reactivity, only a few examples of these compounds have been observed. The aim of this project was to investigate the reactivity of high-valent Ni(III) complexes, containing a monodentate oxygen-donor ligands, in hydrogen atom abstraction (HAA) and oxygen atom transfer (OAT) reactions which are typical of biological high-valent metal-oxygen

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30

Jones, Philip. "Oxidative and reductive radical cascades towards polycycle construction." Thesis, University of Nottingham, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336861.

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31

Abd, El Ghani A. F. M. "Biomimetic oxidative syntheses of spirodienone and dibenzocyclooctadiene lignans." Thesis, Swansea University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.635823.

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The work described in my thesis outlines the achiral and chiral synthesis of lignans by cyclisation reactions <I>via</I> oxidation of phenols. The synthesis of achiral lignans <I>via</I> oxidation of the phenolic tandem conjugate addition products to but-2-en-4-olide utilizing diphenyl thioacetals as acyl anion equivalents, followed by <I>in situ</I> trapping with aromatic aldehyde or benzyl halide afforded the adducts in good yields. Desulphurisation yielded dibenzylbutyrolactones among which were arctigenin and prestegane A. These were successfully cyclised to spirodienone and dibenzocyclooc

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32

Jollet, Véronique. "Complexes de fer bio inspirés pour la catalyse d'oxydation : systèmes homogènes et supportés." Phd thesis, Université Paris Sud - Paris XI, 2011. http://tel.archives-ouvertes.fr/tel-00915279.

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Certaines métalloenzymes catalysent l'oxydation de petites molécules organiques, dans des conditions douces (par activation du dioxygène à température et pression ambiante). Ce travail a pour but d'améliorer l'utilisation et l'efficacité catalytique des complexes de fer mimant cette activité.D'abord, par fonctionnalisation du ligand, un des complexes les plus efficaces pour catalyser l'oxydation de substrats aromatiques par H2O2, a pu être greffé dans des mésopores de silice. Ce matériau est utilisé comme support de catalyseur, en raison de sa grande surface spécifique et de sa chimie de surfa

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33

Santos, Marcello Moreira. "Degradação oxidativa de ligninas pelo sistema biomimetico Gif." [s.n.], 1994. http://repositorio.unicamp.br/jspui/handle/REPOSIP/249505.

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Orientador : Ulf Friedrich Schuchardt<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Quimica<br>Made available in DSpace on 2018-07-18T23:51:06Z (GMT). No. of bitstreams: 1 Santos_MarcelloMoreira_M.pdf: 2852451 bytes, checksum: 507aea78151c80078a8a9b7e24df6539 (MD5) Previous issue date: 1994<br>Mestrado

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Perraud, Olivier. "Les hémicryptophanes : de la reconnaissance moléculaire à la catalyse supramoléculaire." Thesis, Lyon, École normale supérieure, 2012. http://www.theses.fr/2012ENSL0722.

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La synthèse de molécules possédant une cavité présente un grand intérêt car ces dernières peuvent agir comme récepteurs moléculaires ou comme catalyseurs supramoléculaires et ainsi mimer l'activité des enzymes. Les hémicryptophanes possèdent ainsi des cavités dissymétriques complexes formées à partir d'une unité cyclotrivératrylène et d'une seconde unité de symétrie C3 et présentent des propriétés catalytiques et de reconnaissance particulièrement intéressantes.Les travaux effectués au cours de cette thèse reposent donc sur la synthèse de nouveaux hémicryptophanes et sur leur utilisation pour

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35

Johansson, Mikael. "Development of Biomimetic Catalytic Systems for Selective Oxidations with H₂O₂ and O₂ /." Stockholm : Department of Organic Chemistry, Stockholm university, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-7502.

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36

Lindén, Auri. "Flavins as biomimetic catalysts for sulfoxidation by H₂O₂ : catalyst immobilization in ionic liquid for H₂O₂ oxidations /." Stockholm : Department of Organic Chemistry, Stockholm University, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-623.

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37

Raibeck, Laura. "Environmental analysis of biologically inspired self-cleaning surfaces." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24727.

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38

Noriega, Omar Antonio Uyarte. "Sistemas oxidativos e biomiméticos aplicados à hidrólise enzimática de materiais lignocelulósicos." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/97/97131/tde-29032017-102303/.

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Inúmeros trabalhos da literatura científica mostram que a remoção parcial de lignina é útil para facilitar o processo de sacarificação enzimática de materiais lignocelulósicos. No entanto, a maioria dos processos de deslignificação aplica condições severas de reação e apresenta custos elevados de processo. Uma alternativa aos processos mais severos de deslignificação envolve a aplicação de sistemas biomiméticos. Estes sistemas demandam condições amenas de reação, compatíveis com a etapa de hidrólise enzimática, porém geralmente são mais lentos e menos eficientes do que os pré-tratamentos quími

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39

Newsome, Bradley J. "Addressing Public Health Risks of Persistent Pollutants Through Nutritional Modulation and Biomimetic Nanocomposite Remediation Platforms." UKnowledge, 2014. http://uknowledge.uky.edu/chemistry_etds/38.

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Due to their relative chemical stability and ubiquity in the environment, chlorinated organic contaminants such as polychlorinated biphenyls (PCBs) pose significant health risks and enduring remediation challenges. Engineered nanoparticles (NPs) provide a novel platform for sensing/remediation of these toxicants, in addition to the growing use of NPs in many industrial and biomedical applications, but there remains concern for their potential long-term health effects. Research highlighted herein also represents a transdisciplinary approach to address human health challenges associated with exp

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Vincent, Jean-Marc. "Réactivité chimique de complexes binucléaires de fer (III) à pont oxo : catalyse d'oxydation d'alcanes et agrégation d'espèces ferriques." Université Joseph Fourier (Grenoble ; 1971-2015), 1995. http://www.theses.fr/1995GRE10188.

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Le travail présente contribue à la modélisation fonctionnelle des protéines à fer-oxo. Une première étude porte sur les propriétés catalytiques en oxydation d'alcanes de nouveaux complexes bi nucléaires de fer#3#+ a pont oxo, modèles du site actif de la méthane monooxygenase (mmo). Il a été montré que les complexes bi nucléaires ferriques à pont oxo et a ligands de type bipyridine, possédaient une activité catalytique en oxydation d'alcanes importante lorsque l'oxydant utilise est l'hydroperxyde de tertiobutyle (tbuooh). Les résultats de l'étude structure/réactivité montrent que la présence d'

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Chabut, Barbara. "Complexes binucléaires à fer non-heminique : activité biomimétique et échange de ligands." Université Joseph Fourier (Grenoble ; 1971-2015), 1997. http://www.theses.fr/1997GRE10234.

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Notre travail s'inscrit dans le cadre de la recherche de complexes modeles de sites actifs binucleaires d'enzymes a fer non heminique et plus particulierement de l'hemerythrine et de la methane monooxygenase. Pour cela, nous avons synthetise des composes dans lesquels le centre binucleaire est dissymetrique, c'est a dire que les deux ions metalliques sont dans des environnements differents. Ainsi lors de la synthese de complexes a valence mixte, fe#i#i#ife#i#i, l'ion ferrique est dans un environnement n#3o#3 alors que l'ion ferreux se trouve dans un environnement n#2o#3x, un ligand exogene com

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Renaud, Jean-Paul. "Oxydations d'alcanes et d'alcènes par des systèmes métalloporphyriniques modelés du cytochrome P-450." Paris 6, 1986. http://www.theses.fr/1986PA066139.

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La synthèse d'une pophyrine de fer à "anses de panier" chirale comportant des aminoacidés de configuration déterminée est décrite. On a étudié sa pureté optique et sa conformation en solution. Dans une deuxième partie on décrit un nouveau système oxydant catalytique utilisant l'eau oxygénée en présence d'une porphyrine de manganèse et d'imidazole permettant la conversion quantitative d'alcènes en époxydes et d'alcanes en alcools et cétones.

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Ourari, Ali. "Étude de deux réactions d'électrocatalyse : hydrogénation électrocatalytique sur des films de polymères contenant des microparticules de métaux nobles et activation de l'oxygène par des complexes Mn(III) - bases de Schiff." Université Joseph Fourier (Grenoble ; 1971-2015), 1995. http://www.theses.fr/1995GRE10171.

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Ce travail est relatif a l'etude de deux reactions d'electrocatalyse. La premiere partie concerne la mise au point de cathodes moleculaires, realisees par l'inclusion de microparticules de metaux nobles dans des films de polypyrrole fonctionnalise et a leur application en hydrogenation electrocatalytique. L'etude de l'hydrogenation de deux substrats test, le limonene et la carvone, a montre qu'il est possible d'orienter la selectivite de ces electrodes modifiees selon la nature du metal incorpore (pt, pd ou rh). Le resultat le plus significatif est que l'incorporation dans le meme film de poly

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Malloy, Mary Catherine. "Electronic and mechanistic studies of a biomimetic small-molecule catalyst capable of oxygen-dependent alkane oxidations." Thesis, 2020. https://hdl.handle.net/2144/42627.

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The productive, controlled activation of O2 via small-molecule catalysts remains a significant challenge to bioinorganic chemistry. With enzymes, global folding energies dictate the positioning of ligands to optimize chemical pathways. Synthetic iron catalytic complexes, with open or labile coordination sites, frequently give rise to Fenton-like radical-based reactions. To minimize such peroxide/hydroxyl radicals, we developed a synthetic model for the 2-oxoglutarate-dependent dioxygenases, [FeII(N2O1)]- (N2O1 = 2-((2-dimethylamino)ethyl)-(methyl)amino)acetic acid) . We present herein an iron

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Liu, Chih-Cheng, and 劉之誠. "Room Temperature Biomimetic Catalyst for Aliphatic C–H Bond Oxidation: Copper(II) Complexes Immobilized in Functionalized Mesoporous Silica Nanoparticles." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/73410740092133475672.

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博士<br>國立臺灣大學<br>化學研究所<br>103<br>In this dissertation, two kinds of room temperature biomimetic catalysts were developed by immobilizing the active copper model complexes into the nanochannels of functionalized MSNs. These heterogeneous catalysts can efficiently catalyze aliphatic C-H bond oxidation with high turnover number and selectivity. In chapter 3, a tripodal tridentate copper(II) complex, CuImph (Imph = bis(4-imidazolyl methyl)benzylamine), is synthesized to mimic the active site of copper enzymes that mediate the oxidation of aliphatic C–H bonds under mild condition. The stability and

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Fontaine, Barbara. "Oxidative coupling between halogenated phenols and humic acids under biomimetic catalysis." Tesi di dottorato, 2009. http://www.fedoa.unina.it/4305/1/Fontaine.pdf.

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HSU, WEI-HSUAN, and 徐偉軒. "Selective oxidation of benzene and toluene mediated by cytochrome P450 BM3 and its biomimetics." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/11582490648676282429.

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碩士<br>國立中央大學<br>化學學系<br>105<br>According to our earlier study in cytochrome P450 BM3, for the oxidation of simple aromatics, we chose to mutate its amino acid residue at position 328 from alanine to phenylalanine. The catalytic efficiency (turn over frequencies (TOF)) of toluene and benzene, mediated by this specific mutant, for the phenol and cresols production, can be increased 2.5 to 4 times higher than the wild-type strain. On the other hand, in the case of another cytochrome P450 BM3 variant, A74G F87V L188Q, except to the formation of o-cresol of toluene oxidation at sp2 position, one ad

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"Model studies of catechol dioxygenases." 2001. http://library.cuhk.edu.hk/record=b5890725.

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Lam Chun Pong.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2001.<br>Includes bibliographical references.<br>Abstracts in English and Chinese.<br>Table of Contents --- p.i<br>Acknowledgements --- p.v<br>Abstracts --- p.vi<br>Abbreviations --- p.viii<br>Chapter CHAPTER 1. --- SYNTHESIS AND REACTIVITY STUDIES OF MODEL COMPLEXES FOR INTRADIOL DIOXYGENASES WITH BENZIMIDAZOLE- CONTAINING LIGAND<br>Chapter I.1 --- Introduction<br>Chapter I.1.1 --- General Background --- p.1<br>Chapter I.1.2 --- A General Review on the Modeling Chemistry for Catechol Dioxygenases --- p.3<br>Chapter I.1

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Nuzzo, Assunta. "Immobilization of a biomimetic catalyst on clay minerals. Study of the activity of the supported catalysts on the oxidative coupling of humic molecules and precursors." Tesi di dottorato, 2011. http://www.fedoa.unina.it/8684/1/Nuzzo_Assunta_24.pdf.

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Two novel heterogeneous biomimetic catalysts were synthesized by immobilizing a meso-tetra(2,6-dichloro-3-sulfonatophenyl)porphyrinate of manganese (III) chloride [Mn(TDCPPS)Cl] on both kaolinite (K) and montmorillonite (M) clay minerals, previously functionalized with a molecular spacer ending with an imidazole group, whose nitrogen atom firmly coordinated the metal in the porphyrin ring. The clay functionalization by a 3-(1-imidazolyl)propylcarbamoyl-3′-aminopropyl-triethoxysilane spacer was proved by DRIFT-IR, 13C- and 29Si-CPMAS-NMR spectroscopies, and the percent of Mn(TDCPPS)Cl immobiliz

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Terrett, Richard Norman Leslie. "Computational Investigation of the Oxygen Evolving Complex of Photosystem II and Related Models via Density Functional Theory." Phd thesis, 2017. http://hdl.handle.net/1885/133592.

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The first step of photosynthetic metabolism effects the facile oxidation of water to dioxygen and hydrogen cations. This is achieved through an incompletely-understood process of light-driven four-electron oxidation at the Mn4CaO5 cofactor of the Oxygen Evolving Complex (OEC) of the Photosystem II (PSII) holoenzymatic complex in photosynthetic autotrophs. Biomimesis of this reaction—artificial photosynthesis—may offer energy-efficient routes to industrial hydrogen generation and value-added derivatives, with implications for solar energy fixation. T

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