Dissertations / Theses on the topic 'Composé spiro'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 17 dissertations / theses for your research on the topic 'Composé spiro.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
Brouillac, Clément. "Systèmes π-conjugués donneur-accepteur : composés spiro et nano anneaux pour des diodes organiques électrophosphorescentes." Electronic Thesis or Diss., Université de Rennes (2023-....), 2023. http://www.theses.fr/2023URENS097.
Full textOrganic electronics (EO) is based on organic semiconductors (OSCs). Organic light-emitting diodes (OLEDs) are among the most mature EO technologies and are already present in our smartphones, computers and televisions. During this thesis, we were particularly interested in the development of host materials for the second generation of OLEDs: organic electrophosphorescent diodes (PhOLEDs). Two different molecular designs have been elaborated with two different objectives. The first objective was to develop new host materials using the Donor-spiro-Acceptor architecture for single-layer PhOLEDs, which are simplified devices using only the electrodes and the emissive layer. This work has enabled the fabrication of single-layer PhOLEDs in the three colours present in a pixel (red, green and blue) and in the colours used for lighting (yellow and white). Device performance records have been obtained. The second objective was to develop new SCOs, with a cylindric shape, called nanohoops. After a bibliographic chapter analysing the performance of nanohoops in EO, we present a structure/properties study of Donor-Acceptor nanohoops. This work enabled us to gain a better understanding of the unique properties of these carbazole-based nanohoops, which were then incorporated into multilayer PhOLEDs to measure their performances. This work provides the first exemples of the field
Boulebnane, Hassane. "Étude conformationnelle et structurale des molécules hétéro-1 spiro (2. 5) octane par spectroscopie micro-onde." Nancy 1, 1988. http://www.theses.fr/1988NAN10091.
Full textPozzo, Jean-Luc. "[2H] chromènes hétéroannellés, spiro[ fluorène-[2H]-chromènes] et spiro [indoline-phénanthrolino-xazines] : synthèse et équilibre photochromique." Aix-Marseille 2, 1994. http://www.theses.fr/1994AIX22038.
Full textDalinot, Clément. "Synthèse de composés spiro pour l'électronique plastique : relations structure-propriétés." Thesis, Angers, 2016. http://www.theses.fr/2016ANGE0070.
Full textIn organic electronics or photonics field, the molecular materials can be elaborated on fashion in order due to their synthetic versatility which represents a strong advantage for their optimal integration in corresponding devices. In this context, this thesis work was devoted to the development and study of spiro compounds for organic electronics applications. After a first opening chapter focusing on the state of the art of various uses of spiro compounds in molecular electronic, the two following chapters are devoted to the development and implementation of new organic molecules including a spiro node. Therefore, chapter 2 is completely devoted to the synthesis of envisioned target molecules. It resumes the functionalisation of a well-spread spiro compound: the spirobifluorene, as well as the optimized synthesis of some previously described bi-heterocyclic analogs. Finally, the presentation of a new synthesis methodology starting form bis-aryl ketones is exposed and streamlined with a theoretical approach. Concerning the chapter 3, it collects all physicochemical characterizations of the prepared compound in order to emit some simple molecular engineering rules. Moreover, the characterization of electronic devices incorporating our molecules as active materials allow us to highlight the benefits of spiro molecules by comparison to their linear analogs
Lucas, Fabien. "Systèmes π-conjugués pour l'électronique organique : composés donneur-spiro-accepteur et anneaux moléculaires." Thesis, Rennes 1, 2020. http://www.theses.fr/2020REN1S042.
Full textOrganic electronics is a field of research dealing with the development of new technologies based on organic semiconductor materials (OSCs). In general, two approaches are used for the molecular design of OSCs. The first approach consists in assembling efficient molecular fragments, in order to synthesize functional materials for a specific application such as phosphorescent organic light-emitting diodes (PhOLEDs). The second approach is more risky as it aims to develop new molecular fragments which may have one or several desired properties for a given application. In this thesis work, both approaches have been developed. On the one hand, we have developed host materials for PhOLEDs by adjusting their properties (first approach), and, on the other hand, we have been interested in a new generation of OSCs: molecular nanorings (second approach). In a first part, within the framework of developing new host matrices for simplified PhOLEDs so called single-layer, we will present a study of two families of SCOs based on a Donor-spiro-A-acceptor molecular design. This work has enabled to reach the, green and blue PhOLEDs displaying the highest overall performances ever reported in literature. In a second part, after a detailed bibliographical study on the synthesis and on the singular properties of nanorings, we will present our investigations in the field of nanorings. We report herein the synthesis and the study of two families of molecular nanorings constructed with carbazole units. This work allowed us to incorporate for the first time molecular nanorings in organic field-effect transistors in order to study their transport properties
Jaegli, Stéphanie. "Approche vers la synthèse d'analogues de la rustmicine et nouvelles voies d'accès à des spiro-oxindoles par réactions domino palladocatalysées." Paris 11, 2008. http://www.theses.fr/2008PA112212.
Full textThis thesis work has been divided into two distinct parts. First part of the project was focused on the synthesis of conformation ally constrained macrocyclic analogues of the natural compound rustmicine. Our strategies involving respectively as key step a Ullmann reaction and a SNAr reaction didn’t lead to desired macrocycles but put in evidence an interesting reactivity of the β-keto-γ, δ-unsatured-ester precursors. In the second part of the work we prepared spiro-oxindole compounds using different palladium-catalysed domino reactions. Using a domino Heck/cyanation reaction as key step allowed us to prepare horsfiline as well as other spiropyrrolidinyl-, and spiropiperidinyl-oxindoles thus underlining the versatility of the 3-cyanomethyloxindole intermediates. Two new routes to spiropyrrolidinyl-oxindoles allowing formation of the tricyclic core in one step have then been developed : the first method involves a Pd0 catalyzed intramolecular carboamination of o-iodoanilides and the second method involved an aminopalladation/C-H bond activation sequence catalyzed by PdII in presence of an oxidant. Both routes are complementary allowing efficient synthesis of diversely substituted spiropyrrolidinyl-oxindoles
Allous, Iyad. "Synthèse de composés diaza-spiraniques analogues d'alcaloïdes cytotoxiques et anticancéreux." Le Havre, 2010. http://www.theses.fr/2010LEHA0004.
Full textOur contribution for the synthesis of spiro-oxindole templates is presented in this memory. For that purpose we have investigated two different approaches employing N-substituted α-bromoacetamides in tandem processes. In the first chapter we have highlighted the importance of chemotherapy in the treatment of disease such as cancer. Among the efficient molecules discovered, the unique structure of the spiro oxindole framework has encouraged the creativity of many researchers. In the second chapter our work was focused on the development of a tandem process to allow the access to oxindoles spiro-fused with succinimide ring. α-Hydroxy-γ-lactams were obtained by regio- and stereoselective reduction of one of both carbonyls of the succinimide moiety and were then engaged in π-cationic cyclization reactions via N-acyliminium species generated by Lewis or Bronsted acids. Thus, complex pentacyclic spiro oxindoles molecules were isolated in good yields and high diastereoselectivities. The third chapter was centered on the application of a new tandem reaction developed in our Laboratory for the synthesis of oxindoles spiro-fused with γ-lactams. The wide variety of reachable structures employing this strategy should allow us to obtain in the near future numerous spiro oxindole frameworks depending on the chemistry involved. Already, Friedel-Crafts and Dieckmann cyclizations were shown to be efficient for the synthesis of elaborated tetra- and pentacyclics spiro oxindole systems, which could be considered as analogous to numerous spiro alkaloids models
Kotera, Mitsuharu. "Synthèse de composés azaspiranniques via régression d'énamines hétérocycliques fonctionnelles : synthèse formelle de la ( + ou - )-perhydrohistrionicotoxine." Rouen, 1987. http://www.theses.fr/1987ROUES018.
Full textGoudedranche, Sébastien. "Réactions domino organocatalysées énantiosélectives à partir de cétoamides." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4354.
Full textThis work focused on the development of novel enantioselective transformations combining Multiples Bond-Forming Transformations and organocatalysis which are modern tools of organic synthesis in order to synthetize molecules of structural and biological interests. In this context, we developed two new Michael addition initiated domino reactions. The first one, a domino Michael addition-acylation, allows the synthesis of optically active spiroglutarimides starting from β-ketoamides and α,β-unsaturated acyles cyanides as new biselectrophiles.The second one, a domino Michael addition-hemiaminalizationhemiacetalization, allows the synthesis of seven-membered aza-cycles using α-ketoamides as new bis-nucleophiles
Planas, Loïc. "Synthèse asymétrique de la (-)-céphalotaxine et d'analogues." Paris 5, 2003. http://www.theses.fr/2003PA05P625.
Full textThis work is about a new asymmetric synthesis of cephalotaxine, a natural product that has a great therapeutic interest against chronic myeloid leukaemia. The target molecule is a pentacycle with three stereogenic carbones which one is a spiro centre. The study allowed to achieve the synthesis 1-azaspiro[4,4]nonane compounds from α,β-insaturated γ-lactams. The sequence, based upon the chemistry of silyloxypyrroles and acyliminiums, uses a particular type of semi-pinacolic rearrangement leading to a ring expansion. The use of (S)-1-(1-naphtyl)ethylamine as a chiral auxiliary allowed to obtained this moiety in an asymmetric fashion with good yields. The end of the synthesis of enantiopure cephalotaxine was achieved on the base of known results that have been revisited. Furthermore, a series of four analogues has been prepared. Finally, a new and particularly rigid chiral diamine has been designed and tested in an organic asymmetric catalysis reaction
Schäfer, Christian. "Reactivity of acetylenic ω-keto-esters towards transition metal complexes : synthesis of polycyclic motives of natural products." Thesis, Strasbourg, 2013. http://www.theses.fr/2013STRAF006/document.
Full textIn this work, the reactivity of acetylenic ω-ketoesters towards different metal complexes was investigated. When acetylenic ω-ketoesters are submitted to Ti(OiPr)4/iPrMgBr, the formation of fused bicyclic γ-hydroxy-α,β-unsaturated esters was observed. The products were obtained with absolute selectivity in regard to the ring junction formed (cis) and the configuration of the double bond (E) and could be transformed into the corresponding α,β-unsaturated lactones, substructures of various natural products. When ω-ketoalkynes are used in Ag(I)-catalyzed cycloisomerization reactions, the formation of spirocyclic compounds was observed. By taking advantage of the reaction intermediates of this reaction, it was possible to isolate the corresponding spirocyclic alkenyl iodides. Performing cycloisomerization reactions with acetylenic ω-ketoesters, spirocyclic α,β-unsaturated esters are formed. We could show that these products are valuable substrates for the formation of 6-5-5- and 6-6-5-fused tricyclic systems which represent the skeleton of a large group of natural products
Guénon, René. "Vulnérabilité des sols méditerranéens aux incendies récurrents et restauration de leurs qualités chimiques et microbiologiques par des apports de composts." Phd thesis, Université Paul Cézanne - Aix-Marseille III, 2010. http://tel.archives-ouvertes.fr/tel-00555463.
Full textHelal, Wissam. "Utilisation des méthodes de localisation multi-référence pour les systèmes quasi-dégénérés." Toulouse 3, 2009. http://thesesups.ups-tlse.fr/1337/.
Full textThe electronic structure and the intramolecular charge transfer properties of a selected number of mixed valence compounds were investigated at multireference ab-initio level, using both canonical and localized molecular orbitals. The chemical compounds studied are: a spiro p-s-p molecular cation: 5,5_(4H,4H_)- spirobi[cyclopenta[c]pyrrole]2,2',6,6'tetrahydro cation (the "Spiro" molecule in the following); a series of cationic linear chains composed of beryllium atoms: BeN, (with N = 6,. . . , 12); and two bis-Triaryl amines molecules: namely N,N,N',N'-Tetra(4-methoxyphenyl)-1,4-phenylenediamine cation, and bis{4-[N,N-di(4-methoxyphenyl)amino]phenyl}butadiyne cation. The theoretical models and computational methods used in this work are: CAS-SCF, CAS+S, CAS+SD (MRCI), and CAS+SD using localized orbitals. Different basis sets contractions were used. For Spiro cation, The potential energy surfaces of the adiabatic ground and the lowest three excited electronic states have been computed, within a two-state model, and a double-well potential has been obtained for the ground electronic state. We have demonstrated a low coupling interaction between the two redox moieties of this molecular cation by following the charge localization/delocalization in the valence _ system through the reaction coordinate of the intramolecular charge transfer. The effect of dynamical correlation, using either localized or canonical orbitals, was found to be crucial for a quantitative description of the electronic structure and some important electron transfer parameters of this model mixed-valence system. The results of the linear beryllium chains show a consistent gradual shift between different classes of mixed-valence compounds as the number of beryllium atoms increases, from class-III strong coupling toward class-II valence trapped. Indeed, in the largest cases (N > 10), the cationic chains were found to be closer to class I, where the coupling vanishes. The intramolecular electron transfer parameters Vab, Ea, and Eopt were calculated for each atomic chain. It is shown that the decrease of Vab with increasing N follows an exponential pattern
PITZANTI, PATRIZIA. "Sintesi di molecole organiche enantiomericamente arricchite con l'uso della catalisi organica." Doctoral thesis, Università degli Studi di Cagliari, 2014. http://hdl.handle.net/11584/266431.
Full textKern, Nicolas. "Réactivité d'azacycles en catalyse à l'or." Thesis, Strasbourg, 2014. http://www.theses.fr/2014STRAF012/document.
Full textOrganometallic catalysis is a key tool of modern chemical synthesis. lts use is ubiquitous in the preparation of bulk or fine chemicals, in particular for the assembly of carbon-carbon and carbon-heteroatom bonds. Besides its overall efficiency, it responds to the responsible criteria of energy and atom economy, the reduction of waste, risk, and financial costs needed to perform a chemical reaction.ln just a few years, homogenous gold catalysis has emerged as an invaluable tool for the fast generation of molecular complexity. lndeed, it allows the strong electrophilic activation of unsaturated hydrocarbon moieties (e.g. alkynes or alienes). During this PhD thesis, we focused our studies on the use of gold's pi acidity as weil as its "classical" - but less discussed - Lewis acid character for the triggering of cascade reactions.Starting from acetylenic heterocycles, we targeted the synthesis of polycyclic compounds. The milder reactivity of silver complexes was also found useful in these reactions, as weil as in the deprotection of methoxybenzyl ethers
Peltre, Clément. "Potentialité de stockage de carbone dans les sols par apport de matières organiques exogènes." Phd thesis, AgroParisTech, 2010. http://pastel.archives-ouvertes.fr/pastel-00602825.
Full textL'étude de la composition chimique de la fraction dite soluble du fractionnement biochimique Van Soest a révélé que la nature chimique de cette fraction de MO change lors du traitement par compostage des MOEs: elle est très riche en polysaccharides en début de compostage et s'enrichit en MO riche en composés azotés stabilisés au cours du compostage.
Le potentiel d'utilisation de la spectroscopie proche infra-rouge (SPIR) pour caractériser les MOEs et leur devenir dans le sol a été étudié. Des prédictions satisfaisantes ont été obtenues pour les teneurs en C et N des MOEs ainsi que pour les fractions biochimiques Van Soest des MOEs. L'indicateur de stabilité de la MO (ISMO), estimateur de la fraction résiduelle de la MO des MOEs à long terme dans les sols, a été prédit de manière satisfaisante.
La potentialité de stockage de C à long terme dans un sol soumis à des apports répétés de MOEs a été étudiée en utilisant des résultats de 4 essais au champ de moyenne et longue durées. les apports répétés de MOEs ont entrainé des augmentations significatives des stocks de C dans les sols qui ont pu être reproduites de façon satisfaisante avec le modèle RothC qui a été ainsi paramétrés pour pouvoir simuler des apports de MOEs de types divers.
L'étude des changements dans la composition de la MOS suite à ces apports répétés de MOEs dans l'essai Qualiagro a révélé une modification préférentielle de la fraction de MOS particulaire de taille > 50 µm, en particulier par un enrichissement en lignine. La composition de la fraction de taille 0-50 µm est également modifiée mais dans une moindre mesure et de façon moins directement liée à la composition des MOEs apportées.
Albrecht, Remy. "Co-compostage de boues de station d'épuration et de déchets verts : Nouvelle méthodologie du suivi des transformations de la matière organique." Phd thesis, 2007. http://tel.archives-ouvertes.fr/tel-00174775.
Full text