Auswahl der wissenschaftlichen Literatur zum Thema „Hydrures – Réactivité (chimie)“
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Dissertationen zum Thema "Hydrures – Réactivité (chimie)"
Kerdel, Katia. „Synthèse par hydroboration de 1-trialkylsilyl 2-phosphoramidométhyl vinylboranes : Structure et réactivité“. Toulouse 3, 1992. http://www.theses.fr/1992TOU30093.
Der volle Inhalt der QuelleWang, Qunjie. „Synthèse et étude de la réactivité d'hydrures siliciés pentacoordonnés“. Montpellier 2, 1991. http://www.theses.fr/1991MON20052.
Der volle Inhalt der QuelleDebeusscher, Sylvanie. „Stockage et caractérisation de l'hydrogène dans les oxydes mixtes à base de cérium-nickel et zirconium ou aluminium“. Electronic Thesis or Diss., Lille 1, 2008. http://www.theses.fr/2008LIL10122.
Der volle Inhalt der QuelleThe mixed oxides based on cerium-nickel and zirconium or aluminium are able to store large quantities of hydrogen, To determiine nature, reactivity and properties of hydrogen species (spill-over, direct desorption), the solid were studied by different physicochemical techniques in the dried, calcined and partially reduced states: XRD, porosity, TGA, TPR, TPA, TPD, chemical titration and inelastic neutron scattering (INS). Solids are mainly mesoporous with a common pore size at 4 nm, They are constituted of CeO2 phase, Ce-Ni or Ce-Ni-Zr solid solution and of Ni(OH)2 in the dried state and NiO in the calcined state. The Ni species are in various environments and the strong interactions between the cations in solid solution and at different particles interface influence their reducibility and the creation of anionic vacancies. Activation in H2 in temperature is determining for hydrogen storage in the solid while calcination step is not necessary. INS Analyses evidence that the hydrogen species inserted during treatment in H2 are H+( OH-), hydride H- and H* (metallic nickel) species, present in various chemical environments, in particular for hydride species. All kinds of hydrogen species participate to the reaction during the chemical titration in agreement with the proposed hydrogenation mechanism. The study of the adsorption of hydrogen shows that this step is fast and in quantity of the same order as that measured by chemical titration. The direct desorption of H2 is very low, linked to the presence of hydrogen in interaction with metallic nickel (H*-·). Desorption of water is also observed, in parallel, corresponding to the elimination of groups. The hydride species are not desorbed. These various observations allow connecting hydrogen species properties with their localization in the structure and to model active sites
Sadorge, André. „Quelques développements en chimie des hydrures de tantalocène : Comportement de Cp’ 2TaH3 (Cp’ =η 5-C 5H 4- tBu) vis-à-vis de chalcogènes. Synthèse et propriétés d'un nouveau complexe : Cp’ 2taH2+“. Dijon, 1999. http://www.theses.fr/1999DIJOS064.
Der volle Inhalt der QuelleZhang, Dan. „Réduction sélective de CO2 à 4e- en bis(boryl)acetal et implication de ce produit comme réactif pour la synthèse de glucide C2“. Thesis, Toulouse 3, 2020. http://www.theses.fr/2020TOU30148.
Der volle Inhalt der QuelleThis manuscript presents a study of the selective four-electron reduction of CO2 into bis(boryl)acetal and the subsequent use of the latter as an intermediate for the generation of C2 carbohydrates. The first chapter is dedicated to a literature introduction to depict the state of the art in this field concerning the 4e- reduction of CO2 and the reactivity of bis(boryl)acetal compounds in condensation reactions and carbene-mediated homocoupling reactions. The second chapter presents a study on the synthesis of bis(boryl)acetal compounds from selective 4e- reduction of CO2. Four transition metal hydrides are synthesized and used as selective catalysts for the for 4e- reduction of CO2 to bis(boryl)acetal. Three new bis(boryl)acetals are generated and characterized as a result of the application of our catalytic system to non-commercially available hydroboranes. The third chapter contains a study of the transformation of CO2 into C2 carbohydrates. This unprecedented reaction implicates the 4e- reduction of CO2 into bis(boryl)acetal and the subsequent transformation of the latter via carbene mediated or catalyzed homocoupling reactions in a one-pot two-step strategy. Under optimized conditions, glycolaldehyde is generated in 62% yield
Debeusscher, Sylvanie. „Stockage et caractérisation de l'hydrogène dans les oxydes mixtes à base de cérium-nickel et zirconium ou aluminium“. Thesis, Lille 1, 2008. http://www.theses.fr/2008LIL10122/document.
Der volle Inhalt der QuelleThe mixed oxides based on cerium-nickel and zirconium or aluminium are able to store large quantities of hydrogen, To determiine nature, reactivity and properties of hydrogen species (spill-over, direct desorption), the solid were studied by different physicochemical techniques in the dried, calcined and partially reduced states: XRD, porosity, TGA, TPR, TPA, TPD, chemical titration and inelastic neutron scattering (INS). Solids are mainly mesoporous with a common pore size at 4 nm, They are constituted of CeO2 phase, Ce-Ni or Ce-Ni-Zr solid solution and of Ni(OH)2 in the dried state and NiO in the calcined state. The Ni species are in various environments and the strong interactions between the cations in solid solution and at different particles interface influence their reducibility and the creation of anionic vacancies. Activation in H2 in temperature is determining for hydrogen storage in the solid while calcination step is not necessary. INS Analyses evidence that the hydrogen species inserted during treatment in H2 are H+( OH-), hydride H- and H* (metallic nickel) species, present in various chemical environments, in particular for hydride species. All kinds of hydrogen species participate to the reaction during the chemical titration in agreement with the proposed hydrogenation mechanism. The study of the adsorption of hydrogen shows that this step is fast and in quantity of the same order as that measured by chemical titration. The direct desorption of H2 is very low, linked to the presence of hydrogen in interaction with metallic nickel (H*-·). Desorption of water is also observed, in parallel, corresponding to the elimination of groups. The hydride species are not desorbed. These various observations allow connecting hydrogen species properties with their localization in the structure and to model active sites
Zine, Khalid. „Synthèse régio- et stéréosélective du 4,4,4-trifluorobut-2-énoate d'éthyle porteur d'un groupement tributylstannyl en position alpha ou bêta : réactivité cupro-catalysée des vinylétains en l'absence de complexes du palladium“. Thesis, Tours, 2011. http://www.theses.fr/2011TOUR4044/document.
Der volle Inhalt der QuelleThe development of a simple method to obtain perfluoroalkylated building blocks for their subsequent utilization in the synthesis of Rf-containing compounds is therefore essential to organofluorine chemistry. Perfluoroalkylated vinyl metals constitute an important class of these building blocks.In order to prepare a new perfluoroalkylated bulding blocks, we investigated transition metal-catalyzed-free hydrostannylation of ethyl 4,4,4-trifluorobut-2-ynoate 1. The hydrostannylation took place smoothly in the absence of additive, providing regioselectively high yields of the corresponding α or β stannylated alkenoates depending on the nature of the solvent used. Indeed, we have demonstrated that the hydrostannylation of 1 in hexane provided the β-stannylated product with high regioselectivity (>95%) and excellent yield (>97%). Using methanol as solvent, total α-regioselectivity of the hydrostannylation of 1 was observed, providing α -tributylstannylacrylate as the sole regioisomer in a nearly quantitative yield.Theses new vinyltins reagents readily undergo copper (I) catalyst coupling reactions with various electrophiles as allyl, propargyl, benzyl and alkynyl bromides to provide good yields of the new corresponding acrylates esters bearing a β-trifluoromethyl group.This method provided a new efficient entry to this important class of compounds
Etienne, Michel. „Réactivité de complexes dinucléaires hydrure et alcénylidène ponte du fer vis-a-vis d'hydrocarbures cyanes insatures (mono et dicyanoacétylène, tétracyanoethylène)“. Brest, 1988. http://www.theses.fr/1988BRES2009.
Der volle Inhalt der QuelleFort, Yves. „Nouvelles applications des réducteurs complexes et étude de leur réactivité“. Nancy 1, 1987. http://www.theses.fr/1987NAN10172.
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