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Добірка наукової літератури з теми "Phosphine ferrocénique"
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Дисертації з теми "Phosphine ferrocénique"
Lachguar, Abdelhak. "Pour une chimie plus verte - catalyseurs chiraux supportés sur solide pour recyclage et développement de procédés en continu." Thesis, Toulouse 3, 2022. http://www.theses.fr/2022TOU30023.
Повний текст джерелаThe awareness by society of the concept of sustainable development has led chemists to rethink all industrial processes through the twelve principles of green chemistry. In this “green” approach to chemistry, catalysis, in particular with transition metal complexes, occupies a key place: improvement of activities (lower energy consumption), improvement of selectivities (fewer by-products), discovery of new catalytic reactions (less dangerous reagents, clean solvents, economy of atoms, etc.), control of stereochemistry (synthesis of drugs, polymers) ... Unfortunately, the sometimes high cost of catalysts, their difficulties in recovery or recycling is a barrier to their industrial use. The heterogenization of catalysis reactions (catalyst recycling, simplified product purification) and the development of continuous processes are major challenges that meet societal (environment) and industrial expectations. We wish to answer it here by relying on catalysts prepared from chiral phosphine, phosphinocarbene and ferrocenic carbenes (planar and central chirality) ligands synthesized in the team and having demonstrated excellent activities and selectivities in asymmetric catalysis (hydrogenation, Suzuki -Miyaura). These ligands will be functionalized in order to allow their grafting on a solid support. The nature of the supports (spherical silica, mesoporous silica, etc.), the grafting sites (on the surface, in pores or channels) are elements that we wish to study in order to better understand the role of surface interactions and the phenomena of confinement on the activity and enantioselectivity of the supported catalysts
Panossian, Armen. "Organocatalyse énantiosélective à l'aide de phosphines chirales : études méthodologiques et synthèse de catalyseurs à structure ferrocénique." Paris 11, 2008. http://www.theses.fr/2008PA112304.
Повний текст джерелаDespite the successful application of a large number of chiral phosphorus compounds as ligands in organometallic catalysis, the use of chiral phosphines as organocatalysts remains to date very restricted. In this context, we have considered the development of new enantioselective variants of phosphine-catalyzed transformations. Our first target was the use of allenylphosphonates as original subtrates in phosphine-catalyzed [3+2] annulations. A fine optimization of the reaction conditions was required to reach high conversions into the cyclized products. Some of these compounds were obtained in enantioenriched form by using a chiral binaphthophosphepine catalyst. Enantiomeric excesses ranged from 81% to 95%. Additionally, intramolecular Rauhut-Currier reactions were studied. We observed a lack of reactivity and of selectivity of the chiral catalysts which have been tested so far. Therefore, we decided to prepare new chiral phosphines specifically tailored for enantioselective organocatalysis. Among these phosphines, planar chiral 2-phospha[3]ferrocenophanes displayed interesting properties as organocatalysts. Notably, in [3+2] annulations between allenoates and activated alkenes, they yielded the cyclized products with high enantiomeric excesses (up to 96%), good yields and regioselectivities. Moreover, these phosphines proved to be robust and stable towards oxidation in the reaction conditions, which should allow their recycling and their use as supported catalysts
Laly, Myriam. "Squelettes ferrocéniques bidentates dissymétriques : utilisation pour la complexation." Dijon, 1999. http://www.theses.fr/1999DIJOS043.
Повний текст джерелаFihri, Aziz. "Polyphosphines ferrocéniques : synthèse, coordination et application en catalyse de couplage carbone-carbone et carbone-azote." Dijon, 2005. http://www.theses.fr/2005DIJOS010.
Повний текст джерелаRoutaboul, Lucie. "Synthèse de ligands ferrocéniques polysubstitués enantiomériquement purs : étude de leur chimie de coordination et utilisation en catalyse asymétrique." Toulouse 3, 2003. http://www.theses.fr/2003TOU30119.
Повний текст джерелаAfter a bibliographic survey in chapter I, the synthesis of bis ((S)-2-(diphenylthiophosphinoferrocenyl)methyl)oxide is described in chapter II. This new synthesis is realized in eight steps with a total yield of 70%. Our aim was to design a ligand which could behave as a trans chelating phosphine toward transition metal with the possibility of using the oxygen as a third labile ligand. In order to verify these hypothesis, the synthesis of complexes are realized. X-ray structural analysis of ruthenium and silver complexes confirm our hopes. Then, we wished to extend the study by changing the nature of the heteroatom on the arm that joins the two ferrocenyl phosphines. The very effective method for synthesing these amine ferrocenyl diphosphines is described in chapter III. Moreover, we found a general method for substitution of ferrocenyl alcohol by the way of carbocation. This method which is presented in chapter IV allowed a quasi-quantitative access to ferrocenyl amines, etheroxydes and thioethers within few minutes. Futhermore, a series of ligands that associate phosphino and thioether groups are obtained. The synthesis of platinum complex is realized and its structure is confirmed by X ray analysis. It's worth pointing out that the sulfur asymmetric centre is totally controlled by the planar chirality. .
Cabou, Jérôme. "Synthèse d'une nouvelle classe de diphosphines ferrocéniques optiquement pures : utilisation en catalyse asymétrique." Lille 1, 2004. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/2004/50376-2004-109-110.pdf.
Повний текст джерелаWei, Muh-Mei. "Nouveaux ligands phosphine chiraux pour l'hydrogénation asymétrique." Toulouse 3, 2013. http://thesesups.ups-tlse.fr/2240/.
Повний текст джерелаAsymmetric hydrogenation has advanced the field of asymmetric catalytic technology. Chiral phosphine based ligands have played a significant role for asymmetric hydrogenation. The first part of the thesis is devoted to the synthesis and characterization of new P,N ferrocenyl ligands {1,2-(TosNRCH2)(PPh2)C5H3}FeCp (R = H, Me) and their coordination chemistry with [Ru(p-cymene)Cl2]2, [RhCp*Cl2]2, [IrCp*Cl2]2, [Rh(COD)Cl]2 and [Ir(COD)Cl]2. Intra and inter molecular N-H···Cl bonds were investigated by variable temperature NMR and DFT calculations. Addition of triethylamine to the complexes with R = H allows removing the tosylamide acidic hydrogen atom giving rise to a ferrocenyl amidophosphine ligand coordinated in a bidendate fashion (ê2:P,N). Several complexes were assessed as precatalysts in the hydrogenation and transfer hydrogenation of acetophenone. Heterogeneous hydrogenation catalysis of the arene was observed in the presence of the RhI complex. The TEM and high resolution TEM showed the formation of metallic nanoparticles. In the second part, new P,S ferrocene-based {1,2-(BrC6H4SCH2)(PPh2)C5H3}FeCp ligands have been successfully synthesized and characterized in view of the catalysts anchored on mesoporous materials. In the final part, new complexes of a C2-symmetric bistriazolyl diphosphine coordinated to [Ir(COD)Cl]2, [PtCl2(PhCN)2] and [PdBr2(CH3CN)2] have been synthesized and characterized. The coordination chemistry with [Ir(COD)Cl]2 has been studied as a function of the P/Ir ratio. Hydrogenation and transfer hydrogenation processes catalyzed by these Ir complexes have been investigated, with excellent activities found for the hydrogenation of imines
Mom, Sophal. "Synthèse de nouveaux ligands polyphosphines ferrocéniques : approches structurale et catalytique." Thesis, Dijon, 2012. http://www.theses.fr/2012DIJOS091.
Повний текст джерелаThe design of ligands is of great importance for the development of metal catalysis, in keeping with an ever more sustainable approach of chemistry.The first part of this thesis focuses on a detailed literature review of phosphorus ligands commonly used in catalytic systems for the coupling reactions catalyzed carbon-carbon palladium.The second part deals with the conformational control of the ferrocene backbone within polyphosphine ligands. This conformational control aims at inducing unedited interactions between phosphorus atoms, and also with metal centers. New substituted and hindered cyclopentadienyl rings were synthesized, which allow the assembling of original ferrocenyl triphosphines. The reactions with iron(II) salts of cyclopentadienyl anions substituted with hindering groups (tert-butyl, trityl, super-trityl) and holding either electron-donor or electron-withdrawing phoshino groups (isopropyl, cyclohexyl, furyl) afford a set of novel multidentate ferrocenyl phosphine ligands. Their coordinations towards palladium and platinum were studied. The corresponding coordination complexes were isolated in high yields and fully characterized in solution by multinuclear 1H, 13C, 31P NMR and in solid state by X-Ray cristallography.The third part describes the synthesis and characterization of original ferrocenyl diphosphines. Electrochemical investigation of these ligands and electronic properties of their corresponding diselenide derivatives by NMR 31P‒77Se coupling constants were studied.These ligands were found efficient auxiliaries for palladium-catalyzed arylation of heteoaromatics through C–H bond activation or C‒O coupling, especially at low loading of catalyst, in agreement with sustainable chemistry development requirement
Platon, Mélanie. "Propriétés et performances de phosphines ferrocéniques dans le couplage C-O, C-S et C-N : nouvelles méthodologies de synthèse au palladium." Phd thesis, Université de Bourgogne, 2012. http://tel.archives-ouvertes.fr/tel-00818998.
Повний текст джерелаDwadnia, Nejib. "Ligands ferrocéniqes hybrides (P, N) : synthèse, coordination aux métaux et applications en catalyse de couplage d'arylation." Thesis, Bourgogne Franche-Comté, 2017. http://www.theses.fr/2017UBFCK050/document.
Повний текст джерелаThe research theme developed during this thesis concerns the development of new hybrid ferrocene hybrid (P, N) ligands with controlled conformation, robust and stable to air. These hybrid tetradent ligands comprise two types of coordinating functions with distinct steric and electronic properties. Their coordination chemistry with metals such as gold or palladium has been studied and some isolated Au (I) complexes have been used in the arylation coupling catalysis of aryl iodides