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Dissertations / Theses on the topic 'Catalyse bioinspirée'

Author: Grafiati

Published: 23 November 2024

Last updated: 31 July 2025

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1

Dias, Hugo. "Catalyseurs bioinspirés pour la valorisation du co2 en carbonates cycliques." Electronic Thesis or Diss., Lyon 1, 2024. http://www.theses.fr/2024LYO10192.

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La valorisation du CO2 est une stratégie pouvant permettre la résolution de problématiques contemporaines. En employant comme réactif cette molécule abondante considérée comme un déchet anthropique, la mise en place de synthèses durables de produits à haute valeur ajoutée devient alors un enjeu primordial pour l’industrie chimique. La synthèse des carbonates cycliques est un exemple caractéristique d’une réaction verte convertissant du CO2 en produits d’intérêt pour l’industrie des polymères ou des batteries au lithium. Néanmoins, la cycloaddition du CO2 aux époxydes requiert l’emploi de catal

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2

Diao, Donglin. "Bioinspired complexes engaged within hemicryptophane cage-ligands for O2 activation and C-H bond functionalization in confined space." Electronic Thesis or Diss., Ecole centrale de Marseille, 2022. http://www.theses.fr/2022ECDM0007.

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L’objectif de ces travaux de thèse est le développement de nouveaux ligand-cages hémicryptophanes pour l’obtention de catalyseurs métalliques confinés. Ces catalyseurs seront utilisés pour l’activation bioinspirée d’O2 et la fonctionnalisation C-H en milieu confiné. Le design des cages cibles vise à introduire des ligands bioinspirés pour la coordination de métaux biologiques (Cu, Fe, Zn). La structure hémicryptophane offre une cavité hydrophobe au voisinage du site actif métallique. Cette structure vise à stabiliser les espèces actives et obtenir des réactivités différentes de celles obtenues

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3

Bécart, Diane. "Bioinspired catalysis using oligourea helical foldamers." Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0717/document.

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Catalyse et repliement sont deux notions intimement liées dans la Nature à travers les protéines et les enzymes, puis par extension, avec les catalyseurs synthétiques conçus par les chimistes. Des briques élémentaires artificielles ont été développées depuis deux décennies afin de synthétiser de nouvelles architectures moléculaires ayant une forte propension à se replier, appelées foldamères. Dans de nombreux systèmes biomimétiques inspirés par les biopolymères, la stabilisation d’une forme repliée résulte de la formation d’un fort réseau de liaisons H. Ces squelettes repliés apportent plusieu

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4

Hacihasanoglu, Antoine. "Biomimetic asymmetric catalysis with bioinspired helical foldamers." Thesis, Bordeaux, 2022. http://www.theses.fr/2022BORD0166.

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L’organocatalyse est une méthodologie qui connait un développement rapide, permettant de réaliser des transformations chimiques complexes dans le contexte général de la chimie durable (procédés sans métaux, recyclage des catalyseurs…). Les applications potentielles incluent l'élaboration rapide d'éléments de base avancés et utiles pour le développement pharmaceutique. Malgré de grandes réalisations, les organocatalyseurs souffrent généralement de certaines limitations comme une faible accélération de la réaction, d'un taux de rotation catalytique faible et de la nécessité de quantités importan

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5

Clarasó, Petit Carlota. "Rational design of bioinspired iron and manganese catalysts for the effective and selective epoxidation of alkenes and oxidation of alkanes." Doctoral thesis, Universitat de Girona, 2019. http://hdl.handle.net/10803/666958.

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Metalloenzymes are a fundamental source of inspiration for synthetic chemists. Oxidation metalloenzymes catalyze oxidation reactions with high efficiency under very mild experimental conditions exhibiting exquisite regio- and stereoselectivity. The present dissertation aims at designing efficient and selective bioinspired oxidation catalysts. Looking at the literature there’s a very limited number of aliphatic diamines incorporated as ligand backbones in tetradentate aminopyridine based complexes, which have been revealed as one of the most successful catalysts for these transformations with p

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6

Dzierzak, Joanna. "Bioinspired, heterogeneous amino acid complexes for benign oxidation catalysis." Thesis, University of Southampton, 2011. https://eprints.soton.ac.uk/334198/.

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Metalloenzymes catalyse the most fundamental reactions in organic chemistry from oxidation of hydrocarbons to complex C-C bond forming reactions with exceptional selectivity. Mimicking the active site of a metalloenzyme by immobilising well-defined amino acids containing catalytically active transition metal centres based on transitionmetals on a robust inorganic framework, affords powerful catalysts that can be utilised in oxidation reactions. Porous aluminosilicates, mesoporous silicas and polymers offer suitable supports for single-site bio-derived catalysts. Dispersion of catalytically act

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7

Porcher, Jean-Philippe. "Synthèse de complexes bioinspirés de Mo et W catalyseurs pour la réduction des protons." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066301/document.

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Les enzymes à molybdène ou à tungstène sont présentes dans toutes les formes de vie. La plupart d’entre elles sont des oxotransférases ou des hydroxylases. Elles contiennent un ou deux cofacteurs à molybdoptérine Moco coordiné au centre métallique par une fonction dithiolène. Ce cofacteur est très instable et la synthèse de complexes biomimétiques est difficile. Dans cette thèse, une nouvelle stratégie de synthèse d’un ligand dithiolène (qpdt) analogue du cofacteur à molybdoptérine a été développée. Le complexe de molybdène (Bu4N)2[MoO(qpdt)2] correspondant a été synthétisé et caractérisé. Ce

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8

ZUCCA, PAOLO. "Supported Metalloporphines as novel and bioinspired Lignolytic Peroxidase-like Catalysts." Doctoral thesis, Università degli Studi di Cagliari, 2011. http://hdl.handle.net/11584/266340.

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Current, classical delignification processes are affected by some economical and environmental drawbacks. These approaches often seem to be inadequate, particularly in the perspective of a sustainable green process. Since immobilized metalloporphines can strictly emulate the active site of ligninolytic peroxidases, their use in delignification processes has been presented and future trends outlined. In order to achieve a structural emulation, several coordinating groups have been used to coordinatively immobilize metalloporphines. Synthesized adducts have been characterized by UV/vis and I

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9

Cussó, Forest Olaf. "Highly enantioselective epoxidation with hydrogen peroxide and biologically inspired iron and manganese catalysts." Doctoral thesis, Universitat de Girona, 2016. http://hdl.handle.net/10803/393903.

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Asymmetric epoxidation is one of the most important reactions in synthetic organic chemistry, because chiral epoxides act as versatile electrophiles which can be converted in a number of interesting and useful chiral products. It’s known that current methodologies for obtaining excellent enantioselectivities need to be improved in terms of reaction times, use of not expensive or toxic metals, and avoidance of chlorinated solvents and oxidants that produce undesired wastes. Natural systems, such as iron enzymes are capable of perform this chemistry with high selectivity and efficiency under ver

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10

Seeba, Marten. "Bioinspired dinuclear copper complexes for catalytic oxidation of phenolic substrates." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2017. http://hdl.handle.net/11858/00-1735-0000-002E-E4DC-8.

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11

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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12

Vo, Nhat Tam. "Bioinspired semi-hemic iron(III) complex for chemical and photochemical oxygen atom transfer reactions." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS319.

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L’oxydation des hydrocarbures est une transformation chimique difficile aussi bien en biologie qu’en chimie. Les espèces active métal-oxo en de haut degré d’oxydation sont des intermédiaires capables d’effectuer ces transformations. Dans ce manuscrit, nous rapportons la synthèse et la caractérisation d'un complexe de fer (III) supporté par un ligand hémi-porphyrinique non innocent, construit avec un fragment dipyrrine et deux fonctions pyridines. Les complexes de fer (III) ont été préparés et caractérisés, en mettant l'accent sur leur comportement électrochimique et leur utilisation potentiell

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13

André, Rute da Conceição Tavares [Verfasser]. "Bioinspired composite materials and biomimetic catalysis / Rute da Conceição Tavares André." Mainz : Universitätsbibliothek Mainz, 2014. http://d-nb.info/1052002560/34.

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14

Vidal, Sánchez Diego. "Bioinspired iron models: from diiron complexes to supramolecular functionalized metallocavitands." Doctoral thesis, Universitat de Girona, 2019. http://hdl.handle.net/10803/668200.

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The oxidation of hydrocarbons under soft and selective conditions is a reaction almost exclusively produced under these conditions by enzymes. A lot of these enzymes, posses iron in their metal center, responsible for the reactivity. Not only the metal is responsible for the reactivity, but also the surrounding environment (residues, special geometries) that direct the reactivity of the metal through spececific pathways that enhance the activity and selectivity of the reaction. In this thesis, there have been prepared simple models of bimetalic iron centers, in order to reproduce the reactivit

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15

Isci, Umit. "Novel N-bridged diiron phthalocyanine complexes : synthesis, characterization and application in oxidation." Phd thesis, Université Claude Bernard - Lyon I, 2010. http://tel.archives-ouvertes.fr/tel-00881309.

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The synthetic approach was developed for the preparation of N-bridged diiron phthalocyanines substituted by different electron-withdrawing alkylsulfonyl substituents. Six novel phthalocyanines bearing small (methylsulfonyl, ethylsulfonyl and hexylsulfonyl) and bulky (t-butylsulfonyl, adamantylsulfonyl and cyclohexylsulfonyl) substituents have been prepared and characterized by electrospray ionization mass spectrometry (ESI-MS), UV-Vis, FT-IR and EPR. Two complexes (with hexylsulfonyl and t-butylsulfonyl substituents) were characterized in addition by Mössbauer techniques, X-ray photoelectron s

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16

Gómez, Martín Laura. "Bioinspired iron and manganese catalysts for the effective and selective oxidation of alkanes and alkenes." Doctoral thesis, Universitat de Girona, 2010. http://hdl.handle.net/10803/8056.

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La gran eficiència, selectivitat i les condicions suaus exhibides per les reaccions que tenen lloc al centre actiu de les metal·looxigenases són la font d'inspiració per la present dissertació. Amb l'objectiu de dissenyar catalitzadors d'oxidació eficients hem fet ús de dues estratègies: la primera consisteix en el disseny de complexos amb baix pes molecular inspirats en aspectes estructurals de la primera esfera de coordinació del centre metàl·lic d'enzims de ferro i de manganès. Aquests complexos s'han estudiat com a catalitzadors en l'oxidació selectiva d'alcans i d'alquens fent servir oxid

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17

Company, Casadevall Anna. "O2 activation at bioinspired complexes: dinuclear copper systems and mononuclear non-heme iron compounds. Mechanisms and catalytic applications in oxidative transformations." Doctoral thesis, Universitat de Girona, 2008. http://hdl.handle.net/10803/8048.

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L'activació d'oxigen que té lloc en els éssers vius constitueix una font d'inspiració pel desenvolupament d'alternatives als oxidants tradicionals, considerats altament tòxics i nocius. En aquesta treball s'utilitzen compostos sintètics com a models del centre actiu de proteïnes dinuclears de coure i mononuclears de ferro de tipus no-hemo que participen en l'activació d'oxigen en els éssers vius. Els sistemes dinuclears de coure mostren un centre de tipus coure(III) bis(oxo) que és capaç de dur a terme l'ortho-hidroxilació de fenols de manera similar a la reacció que catalitza la proteïna tiro

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18

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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19

Le, Ha Vu [Verfasser], Arne [Akademischer Betreuer] Thomas, Arne [Gutachter] Thomas, and Christian [Gutachter] Limberg. "Bioinspired solid catalysts for the hydroxylation of methane / Ha Vu Le ; Gutachter: Arne Thomas, Christian Limberg ; Betreuer: Arne Thomas." Berlin : Technische Universität Berlin, 2018. http://d-nb.info/1156462479/34.

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20

Chandra, Anirban. "Synthesis of Bioinspired Dioxygen Reduction Catalysts Involving Mono and Polynuclear Late Transition Metal Complexes and Spectroscopic Trapping of Reactive Intermediates." Doctoral thesis, Humboldt-Universität zu Berlin, 2021. http://dx.doi.org/10.18452/22579.

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Die selektive Funktionalisierung nicht aktivierter C−H-Bindungen und die Disauerstoffreduktionsreaktion (ORR) sind extrem wichtig bei der Beschäftigung mit verschiedenen technologischen Problemstellungen wie der Energiekrise, der Synthese kommerziell relevanter organischer Verbindungen usw. Die Nutzung molekularen Sauerstoffs als reichlich vorhandenes und umweltverträgliches Oxidationsmittel ist von großem Interesse in der Entwicklung bioinspirierter synthetischer Oxidationskatalysatoren. Die katalytische Vier-Elektronen-Reduktion von Disauerstoff zu Wasser erlangte auch immer größere Aufmerks

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21

Chandra, Anirban [Verfasser]. "Synthesis of Bioinspired Dioxygen Reduction Catalysts Involving Mono and Polynuclear Late Transition Metal Complexes and Spectroscopic Trapping of Reactive Intermediates / Anirban Chandra." Berlin : Humboldt-Universität zu Berlin, 2021. http://d-nb.info/1230406808/34.

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22

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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23

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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24

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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25

Bohn, Antoine. "Approche électrochimique de l'activation réductrice du dioxygène à l'aide d'un complexe de fer(II) non hémique." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS471/document.

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Les cytochromes P450 sont des enzymes mononucléaires de fer qui catalysent l’oxydation de liaisons C-H en utilisant le dioxygène de l’air. L’activation de O2 nécessite sa réduction partielle par l'apport de deux protons et deux électrons. Ces derniers sont fournis par le réducteur naturel NADPH par l'intermédiaire d'une flavoprotéine qui permet de convertir l’adduit fer(II)-O2 en un intermédiaire de type fer(III)-peroxo dont les protonations successives permettent la rupture hétérolytique de la liaison O—O et l’obtention d’un intermédiaire de type fer-oxo responsable de l’oxydation du substrat

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26

Jagoda, Malgorzata [Verfasser]. "Bioinspired catalysts for phosphoryl transfer reactions / vorgelegt von Malgorzata Jagoda." 2005. http://d-nb.info/977299023/34.

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27

"Bioinspired Electrocatalytic Hydrogen Production: Synthetic and Biological Approaches." Doctoral diss., 2017. http://hdl.handle.net/2286/R.I.44319.

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abstract: Development of efficient and renewable electrocatalytic systems is foundational to creation of effective means to produce solar fuels. Many redox enzymes are functional electrocatalysts when immobilized on an electrode, but long-term stability of isolated proteins limits use in applications. Thus there is interest in developing bio-inspired functional catalysts or electrocatalytic systems based on living organisms. This dissertation describes efforts to create both synthetic and biological electrochemical systems for electrocatalytic hydrogen production. The first part of this disse

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