Tesi sul tema "Alcènes – Synthèse (chimie)"
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Mihoubi, Mohamed-Naceur. "Réaction de cohalogénation : synthèse d'alpha-méthylène-gamma-butyrolactones : application à la synthèse de la botryodiplodine". Aix-Marseille 3, 1991. http://www.theses.fr/1991AIX30071.
Riollet, Virginie. "Vers la synthèse d'une nouvelle classe de catalyseurs d'époxydation pour la chimie fine". Lyon 1, 2002. http://www.theses.fr/2002LYO10140.
Ajana, Mohammed Aziz. "Acylation d'alcènes monosubstitués portant un groupement fonctionnel sur le squelette carbone saturé : Utilisation des produits obtenus en synthèse". Lille 1, 1993. http://www.theses.fr/1993LIL10047.
Lungulescu-Duval, Monica. "Nouvelles méthodes de préparation d'hétérocycles oxygènes par métathèse : application à la synthèse de l'analogue C-glycosidique du KRN7000". Paris 11, 2002. http://www.theses.fr/2002PA112205.
The KRN7000 is a synthetic α-galactosylceramide showing interesting immunostimulating and antitumor properties. The tests showed that the KRN7000 is not directly cytotoxic in vitro against tumor cells, but in vivo and in vitro, it activates the immune system of the organism. Meanwhile, its utilization in the treatment of some types of cancer might be complicated by the in vivo hydrolysis of the C-0 anomeric bond. For this reason, we have been interested in the synthesis of the C-glycosidic analogue of the KRN7000. The strategy proposed by our laboratory is based on an olefin ring closing-metathesis. In order to check the validity of our scheme, and to use some anterior results, we began by a model study in D-glucose series. The enol ether and the allylglycine, our starting materials, were prepared in good conditions. The esterification and metathesis reactions were optimized. Meanwhile, the reduction of the double bond proved to be difficult. Therefore, we modified our retrosynthetic scheme and worked this time in the natural D-galactose series. In our second approach, we were able to improve the preparation of the vinylglycine by the use of microwaves irradiations. The synthesis of the vinyl-C-glycoside was achieved through the syn opening of an epoxide. We then showed that the esterification reaction is complicated by the isomerization of vinylglycine in basic conditions. The use of a selenium derivative allowed us to avoid this problem and obtain the precursor of the metathesis reaction with good yields. The ring closing metathesis did not lead so far to the desired bicyclic compound, but this reaction is still under study in our laboratory
Chevrie, David. "Alpha-fluorosulfures et alpha-fluorosulfoxydes, précurseurs appropriés à la synthèse de fluoroalcènes (Z)". Caen, 2001. http://www.theses.fr/2001CAEN2068.
Lamarre, Caroline. "Synthèse et réactivité diénophile d'oléfines trifluoromethylées, réactions de condensation et de cycloaddition en cascade". Aix-Marseille 3, 1999. http://www.theses.fr/1999AIX30006.
Llecha, Llop-Quignard Françoise. "Métathèse des oléfines avec les complexes chloro-aryloxy et chloro-aryloxy-carbéniques du tungstène VI : application à la synthèse de phéromones". Lyon 1, 1985. http://www.theses.fr/1985LYO19029.
Declerck, Valérie. "β-aminoesters insaturés obtenus par réaction d'Aza-Baylis–Hillman : des synthons multifonctionnels pour la synthèse d'hétérocycles originaux". Montpellier 2, 2006. http://www.theses.fr/2006MON20024.
This work was dedicated to the synthesis of original heterocyclic structures starting from Beta-aminoesters obtained via the multicomponent aza-Baylis–Hillman reaction. First of all, we have developed new conditions for the aza-Baylis–Hillman of trimethylsilylethanesulfonamide (SES–NH2), methyl acrylate and an aromatic aldehyde. This methode allowed us the preparation of a large variety of unsaturated Beta-aminoesters. These unsaturated Beta-aminoesters are multifunctional synthons for the preparation of heterocyclic structures. We have prepared five membered ring heterocycles by ring closing metathesis. The different deprotection conditions of the SES group (dehydrodesulfinyaltion and Beta-elimination) allowed the synthesis of pyrroles, pyrrolidines and pyrrolines from the same cyclic precursor. We have also prepared triazolodiazepines by the Huisgen reaction and benzazepines by the Heck reaction under microwave activation
Banaszak, Estelle. "Synthèse organométallique de composés bicycliques aza-π-déficients d'intérêt biologique potentiel". Nancy 1, 2007. http://docnum.univ-lorraine.fr/public/SCD_T_2007_0007_BANASZAK.pdf.
This thesis presents two principles aspects: the first one consists in a regioselective metallation methodologic study of aza-π-deficients systems, and the second one, in the synthesis of highly biological interest scaffolds by organometallic way and / or transition metals couplings. So, in a first chapter, we describe the different results of the reaction between the superbasic complex [n-BuLi / LiDMAE] on π-deficient systems such as 7-azaindole or pyrazine. We also present results of other but close superbasic systems [s-BuLi / LiDMAE], [t-BuLi / LiDMAE], [LDA / LiDMAE], [LTMP / LiDMAE] on a model substrate: 3-chloropyridine. Indeed, this substrate allowed us to study regioselectivity and Basicity / Nucleophilicity ratio aspects. The second part of this thesis describes the synthesis of functionalised and functionalisable bicyclic targets especially containing a nitrogen atom such as pyrano[3,2-b]pyridine and oxepino[3,2-b]pyridine using an organometallic way, followed by transition metal couplings and ring closing metathesis. For this last step, we studied the efficiency of first and second generation Grubbs’ catalysts, comparing each, and optimising for each the yield of product obtained compared to the amount of catalyst introduced. Finally, we envisioned the formation of thieno[3,2-b]pyridines functionalised and functionalisable by regioselective lithiation of 3-methylthiopyridine followed by Sonogashira coupling and electrophilic cyclisation
Paillet, Christophe. "Etude des complexes chloro-aryloxy-carbéniques du tungstène et de leur réactivité en métathèse des oléfines : application à la synthèse de l'isononadiène : une nouvelle voie d'accès au citral". Lyon 1, 1989. http://www.theses.fr/1989LYO10135.
Bini, Fabien. "Applications de la chimie organométallique de surface à l'époxydation des oléfines : synthèse de catalyseurs à base de titane et investigations mécanistiques". Lyon 1, 2004. http://www.theses.fr/2004LYO10222.
Hébrard, Frédéric. "Mode de fonctionnement du cobalt dans l'hydroformylation des alcènes catalysée par le système {[Co2(CO)8]/Pyridine/Liquide Ionique}". Toulouse, INPT, 2006. http://ethesis.inp-toulouse.fr/archive/00000397/.
Hydroformylation of alkenes remains, nowadays, a major application in homogeneous catalysis. Annual production of oxo products is still increasing and cobalt carbonyl complexes are playing an important role in this field. The Institut Français du Pétrole has developed a biphasic catalytic system based on the association of a cobalt complex with a nitrogen-containing Lewis base in the presence of a non aqueous ionic liquid, which solves some of the former processes concerns of catalyst recycling and retains satisfactory catalytic activity. In this work, we focused on the understanding of the mechanisms involved in the catalytic behaviour of the {[Co2(CO)8]/Py/IL} system by the mean of high-pressure IR spectroscopic studies. Catalytic activity is to be attributed to the hydridocarbonyl complex [HCo(CO)4] of which formation lies on already suggested redox equilibriums. Cobalt is involved in this system under various forms, within which ionic [PyH][Co(CO)4] was identified as a potential source for [HCo(CO)4], according to an acid-base equilibrium. We also present here the X-ray crystallographic structure for the [Co(Py)6][Co(CO)4]2 ionic complex
Monnier-Benoit, Nicolas. "Étude du processus tandem réaction de Michael-Azacyclisation des imines, énaminomes ou énaminoesters chiraux : application à l'utilisation d'oléfines électrophiles substituées pour la synthèse de synthons azotés chiraux". Le Havre, 2003. http://www.theses.fr/2003LEHA0001.
Laporte, Romain. "Développement de nouveaux composés antibactériens fluorés : application à la synthèse d’inhibiteurs de la thymidylate synthase flavine dépendante (ThyX) de la bactérie Mycobacterium Tuberculosis". Caen, 2016. http://www.theses.fr/2016CAEN2038.
Recently, a new enzyme from thymidylate synthase class has been identified (ThyX). As all the enzymes of this class, ThyX calatyzes the conversion of dUMP to dTMP through the methylation of the C-5 position but only in prokaryote organisms. Among these microorganisms, there are several dangerous pathogens for humans such as Mycobacterium Tuberculosis, the bacteria responsible for tuberculosis. ThyX is a specific enzyme and has no structural or sequential similiarity with eukaryote thymidylate synthase enzyme (ThyA). Biological pathways of theses enzymes are different and ThyX is the only one to need a flavine (FAD) to co-catalyze this transformation. Selective inhibition of flavine-dependent thymidylate synthase ThyX is logically an attractive target for drug discovery. The main part of this PhD work is dedicated to develop new inhibitors selective to flavine-dependent thymidylate synthase. For this purpose, fluorinated acyclonucleoside synthesis has been considered to get around in vivo stability problem with N-glycosidic bond and phosphate moiety. In the past years, our laboratory has developed a straightforward access to fluoroalkylidenes and we are interested in cis-fluorobutenyle moiety preparation to use this sequence as a mimic of the osidic part in a nucleoside. From highly functionalized sulfones with nucleic bases previously made by aza-Michael addition, modified Julia olefination allowed us to prepare a large variety of fluoroalkylidenes. Four-membered heterocyclic ketones’ reactivity in the modified Julia reaction has also been studied. From resulting oxetanylfluoroalkylidenes, we have developed an E-selective ring-opening reaction of the oxetane ring. Thanks to this new methodology, resulting bromo-alcohol derivatives’ reactivity has also been studied and new acyclonucleoside preparation has been undertaken
Rhers, Bouchra. "Synthèse, caractérisation de nouveaux complexes de tungstène et étude de leur greffage par voie COMS sur des surfaces oxydes : application en métathèse stéréo- et énantiosélective des oléfines". Lyon 1, 2006. http://www.theses.fr/2006LYO10177.
Wang, Jian-Xin. "Total synthesis of plakortones A, B & E : synthesis of cyclic peroxides by ring-closing metathesis and synthesis and stereochemistry of (+)-zerumin B & beyond". Doctoral thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24203/24203.pdf.
Gachard-Bouty, Laëtitia. "Utilisation de la métathèse des alcènes pour la synthèse de porphyrines O- et C-glycosylées éthyleniques : Application à la photothérapie dynamique". Limoges, 2003. http://aurore.unilim.fr/theses/nxfile/default/c10866ac-9681-46ce-b476-0a4567702eb4/blobholder:0/2003LIMO0050.pdf.
In recent years, photodynamic therapy has received increasing attention as a new modality for selective treatment of solid tumors. Glycosylated porphyrins are especially promising compounds since it is possible that the sugar moiety might lead the conjugate to a cell surface target through specific binding to its receptor. In the present work, we describe, in a first time, the synthesis, via olefin metathesis, of new ethylenic glycoconjugated porphyrins which are derivatives of 5,10,15,20-tetraarylporphyrins. We applied a two-step procedure in which allylic saccharides were first homodimerized prior to the cross-metathesis reaction with mono para- and ortho-allyloxyphenyltritolylporphyrins. The asymetric dihydroxylations of these compounds were then performed in order to increase the amphiphilic properties of the resulting porphyrins. The first synthetised compounds are O-glycosylated porphyrins and the second series, C-glycosylated porphyrins. These last ones are of special interest because of their capacity to resist to enzymatic hydrolysis. The products were characterised by UV-visible and NMR spectroscopy as well as by mass spectrometry. Finally, all the compounds were deacetylated or debenzoylated and in vitro biological tests were carried out so as to evaluate the activity in photodynamic therapy of the free or encapsulated into liposomes products
Boddaert, Thomas. "L'addition de Michael, un vieil outil adapté à la synthèse organique moderne". Aix-Marseille 3, 2009. http://www.theses.fr/2009AIX30039.
The research in organic synthesis turns towards eco-compatibility. Our objective was to answer to these new requirements for the development of new methodologies and for their applications. In this context, we developed a new consecutive reaction (Wolff rearrangement / nucleophilic addition / cross-metathesis reaction / Michael addition) for the preparation of a number of [alpha]-spiro-[delta]-lactones and -lactams. This microwave assisted metallo- and organocatalytic sequence was pursued by domino reactions for the synthesis of polycyclic compounds. During this study, we discovered new organocatalytic properties of nucleophilic N-heterocyclic carbenes (NHC) for the Michael addition, reactivity that was generalised to other original domino and domino-multicomponent reactions. In parallel, we have applied some similar Michael initiated domino-multicomponent reactions to the synthesis of bi- or tricyclic cores of natural terpenes
Petrar, Petronela Maria. "Phosphaalkenes, phosphaallenes : synthesis, and theoretical investigations". Toulouse 3, 2007. http://thesesups.ups-tlse.fr/186/.
This work mainly describes the synthesis of phosphagerma-, phosphasila- and phosphastannapropenes and their reactivity with lithium compounds in order to obtain the corresponding heteroallenes. An important review is devoted to heteroallenes. Theoretical investigations have been made by DFT on phosphagermaallene HP=C=GeH2 and its linear or cyclic isomers. 2,4-Diphosphinylidene-1,3-digermacyclobutanes, formal dimers of the phosphagermaallene Mes*P=C=Ge(tBu)2, and the corresponding bis(methylenethioxo)-phosphoranes, first compounds with two C=P(S) units, have been isolated and structurally characterized. Many phosphametallapropenes (metal = Si, Ge, Sn) have been prepared. Reaction with lithium compounds could lead to new heteroallenes. An arsanylbis(methylene)phosphorane has been prepared; its reaction with a lithium compound led, according to NMR and trapping with methanol, to the first compound with a >C=P(R)=C=As- linkage
Wang, Jingjuan. "Design of efficient catalysts for hydrogenation of carbon oxides to alcohols and olefins". Electronic Thesis or Diss., Lille 1, 2012. http://www.theses.fr/2012LIL10052.
Catalytic hydrogenation of carbon monoxide and carbon dioxide leads to valorisation of syngas which can be produced from fossil and renewable resources. This thesis addresses design of new catalysts for synthesis of alcohols and olefins from syngas containing carbon monoxide and carbon dioxide. Catalyst characterization has demonstrated formation of bimetallic particles in copper-cobalt mixed supported catalysts and enrichment of metallic particles with copper on the outer surface in the reduced catalysts. Comparison with catalytic data suggests that these bimetallic particles probably contain the active sites for the synthesis of alcohols from syngas. The supports (SiO2, Al2O3 and carbon nanotubes), and some promoters, especially iron, also have a very strong influence on the catalyst performance. Promotion with iron also increases productivity of Rh catalysts in the synthesis of ethanol from syngas. The formation of interfaces between the iron and rhodium seems to improve the selectivity of this reaction to ethanol, while carbon monoxide conversion principally depends on rhodium dispersion. The Fe/ZrO2 catalysts promoted with potassium showed a very important selectivity for the synthesis of olefins from carbon dioxide. This increase in selectivity was attributed to the synergy between iron and oxidized species Fe0/χ-Fe5C2 which are involved in this reaction
Braun, Marie-Gabrielle. "Applications de la chimie radicalaire des xanthates : Synthèse d'alpha céto vinyl carbinols. Synthèse stéréosélective de sulfones vinyliques et d'alcènes. Induction de la chiralité sur des systèmes cycliques. Approche à la synthèse des sesquiterpènes de type eudesmane. Approche à la synthèse du (+)-Maritimol". Palaiseau, Ecole polytechnique, 2011. https://pastel.hal.science/docs/00/65/24/41/PDF/Partie_thA_orique_ThA_se_MGB.pdf.
The goal of my first project was to synthesize α-keto vinyl carbinols using xanthate radical chemistry. The sequence starts with the addition of an α-keto radical generated from the corresponding O-ethyl xanthate to vinyl ethyl sulfide. The xanthate adduct undergoes pyrolytic elimination, leading to a mixture of vinylic sulfides and allylic sulfides. The sequence ends with the irreversible Mislow-Evans rearrangement of the corresponding allylic sulfoxides to give the desired α-keto vinyl carbinol moiety. My second project deals with the development of a new methodology for the transfer of chirality by the use of an all carbon tether. Using the xanthate transfer process, we have developed an efficient approach to the stereocontrolled formation of carbon-carbon bonds. A methyl ketone is used as a temporary tether for an alpha-xanthanyl ketone moiety. A xanthanyl radical transfer from this group enables difunctionalization of proximal alkenes with complete control of the stereochemistry. The substrates for this transformation include 4-acetylcyclohexenes conveniently generated by Diels-Alder reactions. The approach shares some features with Stork's silicon-tethered radical cyclization method. Nevertheless, the successful use of 6-exo cyclization and also functionalization of tri- and tetra-substituted olefins is made possible thanks to the reversible nature of xanthate transfer reactions. Quaternary stereogenic centers can therefore be generated in a stereocontrolled manner. The original radical transfer process can be used as a platform for further carbon-carbon bond formation. In addition, the original methyl ketone is regenerated using a modified Beckman fragmentation reaction. I have also been working towards the development of a new methodology that allows the introduction of an unsaturation in a controlled manner. (E)-Vinylsulfones can be synthesized with excellent diastereoselectivity with the use of xanthates and simple aldehydes and ketones and then converted selectively into (E) and (Z) disubstituted and trisubstituted alkenes. My last project concerns the total synthesis of the (+)-Maritimol using radical reactions to build quickly the diterpenoid scaffold. I am currently working on the construction of the fourth and last cycle using a Robinson annelation. I have had previous experience with the total synthesis of natural products during the first year of my Ph. D. At that time, I successfully synthesized the C16-C30 fragment of the Dolabelide C
Manginot, Eric. "Synthèse et réactivité de l'azayldiure de phosphonium et de lithium". Montpellier 2, 1992. http://www.theses.fr/1992MON20139.
Chabanas, Mathieu. "Complexes bien définis alkylidènes et alkylidynes de métaux des groupes 5 à 7 supportés sur silice : synthèse, caractérisation et réactivité en métathèse des oléfines". Lyon 1, 2001. http://www.theses.fr/2001LYO10172.
Calata, Charlène. "Nouvelles méthodes de synthèse de fluoroalcènes par la réaction de Julia modifiée et application à la préparation d'analogues de peptides". Caen, 2010. http://www.theses.fr/2010CAEN2041.
The fluorovinylic moiety plays an important role in the conception of new peptidomimetics. In fact, the substitution of the amide bond by a fluoroalkene increases the compound stability towards enzymatic cleavage. However, access to fluorinated alkenes moiety (in particular fluoroallylamines) is not straightforward and numerous transformations of fluoroacrylates obtained by Horner-Wadsworth-Emmons reactions are needed. In the field, our group described the first one step synthesis of fluoroalkylidenes via a modified reaction of Julia requiring a fluorosulfone and a carbonyl compound. Since this report, our main research deals with the preparation of various highly functionalized fluorosulfones as new tools for synthesis of fluoroalkenes in a convergent manner. In order to access to novel fluoroalkylidenes, synthesis of heteroaryl fluorosulfones has been investigated. The key step involved a conjugated 1,4-addition reaction of aliphatic, aromatic and heterocyclic amines, amino acid alkyl esters, thiolates, alcoolates and activated alkyl chains onto a fluorovinylic sulfone. Corresponding fluorosulfones reactivity were explored in the modified Julia fluoroolefination to afford highly functionalized fluoroalkenes with moderate to good yields. Developed methodology was devoted to the preparation of two fluoropeptidomimetics of Gly-Gly and Lys-Leu. This latter will be incorporated onto a polypeptide involved in immune response. Futur biological evaluation of this analogue will allow us to study structure-activity relationships (binding affinity and immune response) and the effect of the fluorovinylic group towards its stability
Hoffmann, Pascal. "Synthèse de nouvelles métalloporphyrines halogénées : accès à de nouveaux catalyseurs biomimétiques d'oxydation". Toulouse 3, 1991. http://www.theses.fr/1991TOU30207.
Varray, Stéphane. "Utilisation du support poly(éthylène glycol) dans la synthèse d'aminoacides et de peptides cycliques par métathèse des oléfines". Montpellier 2, 2001. http://www.theses.fr/2001MON20191.
Dumonteil, Geoffrey. "Synthèse et pharmacomodulations de composés naturels issus de plantes". Thesis, Orléans, 2015. http://www.theses.fr/2015ORLE2061/document.
Polyene units constitute an important function from organic compounds and are present in many natural products in the form of 1,3-conjugated dienes. It is therefore essential to develop methods to access these dienes while wearing a careful look at the environmental impact. During this work, we were able to synthesize a natural compound which has activity on type II diabetes: the abscisic acid. The key step leading to the success of this synthesis is the Heck reaction. From these results, we have developed a robust and efficient method to obtain various diene compounds (E, Z) and trienes (E, E, Z) without ligand or solvent. The compounds thus obtained are considered as potential analogues of the abscisic acid and are involved in various reactions in order to obtain the corresponding carboxylic acid or its bioisostere. In parallel with this synthesis application, we have developed a pathway to obtain benzo[d]thiazole compounds substituted in position 2 with an N-aryl or N-alkyl. This synthetic methodology is part of a context of environmental compatibility by using iodine catalyst
Lecea, Romera Mercedes. "Stereoselective synthesis of the natural metabolite of tocopherol, (S)-y-CEHC, and monofluorinated trisubstituted olefins". Phd thesis, Université de Strasbourg, 2012. http://tel.archives-ouvertes.fr/tel-01064056.
Chakkingal, Anoop. "Réglage de la sélectivité de la synthèse Fischer-Tropsch : aperçu de la modélisation microcinétique et de l'apprentissage automatique". Electronic Thesis or Diss., Centrale Lille Institut, 2022. http://www.theses.fr/2022CLIL0015.
Striving towards a circular economy has led to the re-investigation of many existing processes, with the target of developing more sustainable variants. In our present economy, plastics form an important and omnipresent material affecting our daily lives. They are inexpensive, durable, corrosion resistant, and light weight leading to their use in a wide variety of applications.Within the plastic chemical recycling scheme, Fischer-Tropsch synthesis (FTS) could play a key role as the syngas feedstock that is converted in it, can be generated via the gasification of the considered plastics. This syngas is then chemo-catalytically converted into hydrocarbons such as paraffins and light olefins. Typical FTS catalysts are based on supported cobalt or iron species.Among the mechanistic kinetic models, the comprehensive variant based on the Single Event MicroKinetics (SEMK) concept has been widely applied in the field of oligomerization, autoxidative curing, etc. and has proven to be a versatile tool to simulate Fischer-Tropsch synthesis. However, developing mechanistic models for every chemical engineering challenge is not always feasible due to their complexity and the in-depth knowledge required to build such models.A detailed evaluation on the potential of using machine learning approaches to match the performance of results obtained using the Single-Event MicroKinetic model was carried out. Initially, the focus was on a single dominant output scenario (methane selective catalyst). The current work thus shows that more widely applied techniques in data science can now be applied for systematic analysis and interpretation of kinetic data. Similar analysis using experimental data can also help experimenters in their preliminary analysis, to detect hidden trends in the data, and thus to identify importance features. After gaining confidence on the investigated interpretation techniques, for the FTS reaction with single dominant output, a similar investigation on the potential of iron based catalysts with enhanced light olefin selectivity is carried out next
Vignon, Paul. "Catalyseurs homogènes et hétérogènes à base de ruthénium pour la métathèse d’oléfines issues de ressources renouvelables". Thesis, Lille 1, 2013. http://www.theses.fr/2013LIL10037.
Production of materials from renewable raw materials is urgent by the decreasing availability of fossil fuels. This need has motivated the emergence of the concept of bio-refinery that certain products obtained in large quantities are derivatives of fatty acids (Fatty Acid Methyl Ester, FAME). These FAMEs are mainly produced by hydrolysis of triglycerides and have already found many application areas. In the context of optimal use of different products by bio-refineries, FAMEs modifications can be implemented thanks to catalysis, including olefin metathesis, taking advantage of the internal double bond present in these compounds. Significant efforts have been made on the ethenolysis of [Delta]9 FAME into [Alpha]-olefins, as these have a wide range of applications, but also on reducing the carbon chain size by reaction with small olefins (C4). Moreover, in order to limit metal contamination of products and to allow catalyst recycling, the use of heterogeneous catalyst is of high interest. We thus prepared heterogenized commercial ruthenium catalysts. These heterogeneous catalysts were prepared in a two-step procedure: modification of the catalyst or the silica and catalysts grafting by ligand exchange on silica. The reactions studied in this thesis concern self-metathesis, ethenolysis and various cross-metatheses of methyl oleate and FAME bio-derived sources using homogeneous catalysts and their grafted analogs. Despite the impossibility of recycling performance, heterogeneous catalysts have achieved our reactions efficiently and some of these reactions are the first example of such transformations with heterogeneous catalysis
Zhang, Jidong. "Utilisation des N-oxydes dérivés d'amino-alcools pour la synthèse de N-H pyrrolidines substituées en position 2, 3 ou 4 et pour l'α-fonctionnalisation d'amines secondaires". Paris 11, 1989. http://www.theses.fr/1989PA112213.
Azomethine ylids generated from tertiary amine oxides by double deprotonation are the only azomethine ylids able to undergo intermolecular 3+2 cycloaddition with non-activated olefins. Thus, 3- or 4-substituted or 3, 4-disubstituted N-alkyl pyrrolidines can be obtained by a simple and direct method. It was important to develop this method for preparing N-H pyrrolidines found in natural products. In the first pan of this thesis, demethylation of N-methyl pyrrolidines was attempted using a variety of literature methods. However none of them appeared suitable for our purpose, mainly because of the lability of the 5 membered heterocyclic ring. Then, we looked for an amine oxide which could easily undergo 3+2 cycloaddition and whose N-alkyl group could be removed under mild conditions. We found that β-amino alcohol (protected) derived amine oxides gave good yields of the corresponding pyrrolidines. Hofmann elimination of the quatemary ammonium salt followed by debenzylation gave quantitatively the N-H pyrrolidines substituted in positions 2, 3 or 4. This methodology is used for the synthesis of a precursor of kainic acid and one of its analogues. In the second part, we propose an original and general method for functionalisation of secondary amines at α-position. β-amino alcohol (unprotected) derived amine oxides treated with t-butyllithium give oxazolidines after intramolecular trapping of the intermediate immonium by the alcoholate. Opening of the oxazolidine ring by a Grignard reagent and removal of the amino alcohol moiety (according to the sequence described above) give access to α-alkylated amines. Several exemples are reponed
Raffier, Ludovic. "Application de la réaction de métathèse d'oléfines à l'obtention de molécules d'intérêt biologique". Phd thesis, Université Claude Bernard - Lyon I, 2012. http://tel.archives-ouvertes.fr/tel-00986492.
Eugene, Fabrice. "Réactivité des espèces dérivées du soufre IV : synthèses de sulfones et d'oléfines et réactions de réduction". Lyon 1, 1992. http://www.theses.fr/1992LYO10218.
Habib, Zahmani Hadjira. "Transformations domino-multicomposés avec les dérivés 1,3-dicarbonylés : nouvelles synthèses stéréosélectives d'alcènes trisubstitués et de spirohétérocycles fonctionnalisés". Aix-Marseille 3, 2006. http://www.theses.fr/2006AIX30043.
Our purpose in this work was to study the reactivity of 1,3-dicarbonyl compounds, in order to prepare polyfunctionalised molecules which can used in the formation of complex structure found in a large number of natural products. We tried to use time saving and environmentally friendly methods based on the development of a new multicomponent-domino reaction between 1,3-dicarbonyls, aldehydes and halides. This sequence allows access, in one operation, to the cycloalkanones with four adjacent reactive sites and a quaternary centre. On the other hand, based on the reactivity of these new substrates, we proposed a fast and efficient synthesis of [4. 4], [4. 6] and [5. 4] spiro-heterocyclic structures using intramolecular post-carbocyclisations with various organometallic complexes. Finally, we developed a versatile and operationally simple base-catalysed multicomponent-domino reaction between [alpha],β-unsaturated carbonyl compounds, aldehydes and alcohols. This transformation provides a new efficient and stereoselective one-pot preparation oftrisubstituted alkenes and 1,3-dienes of high synthetic value
Alric, Jérôme. "Synthèse d’oligomères α-fluoroacryliques photoreticulables : application à la fabrication de fibre optique plastique". Montpellier 2, 2001. http://www.theses.fr/2001MON20054.
DE, VAUMAS RENE. "Hydrogenation et cycloaddition asymetriques sur des complexes de phospha-alcene". Palaiseau, Ecole polytechnique, 1991. http://www.theses.fr/1991EPXX0019.
Boulliung, Nathalie. "Aspects inédits de l'utilisation des carbanions alpha-halogènes fonctionnels en synthèse". Nancy 1, 1995. http://www.theses.fr/1995NAN10335.
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