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<dc:title xml:lang="fr">Liaisons chalcogène et sels de telluromium : synthèse, études et catalyse</dc:title>
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<dc:subject xml:lang="fr">Catalyse</dc:subject>
<dc:subject xml:lang="fr">Chiralité</dc:subject>
<dc:subject xml:lang="fr">Tellure</dc:subject>
<dc:subject xml:lang="fr">Sel de telluronium</dc:subject>
<dc:subject xml:lang="fr">Liaison chalcogène</dc:subject>
<dc:subject xml:lang="fr">Calorimétrie</dc:subject>
<dc:subject xml:lang="fr">Résonance magnétique nucléaire</dc:subject>
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<dc:subject xml:lang="en">Catalysis</dc:subject>
<dc:subject xml:lang="en">Tellurium</dc:subject>
<dc:subject xml:lang="en">Telluronium salt</dc:subject>
<dc:subject xml:lang="en">Chalcogen bond</dc:subject>
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<tef:elementdEntree autoriteExterne="029841143" autoriteSource="Sudoc">Tellure</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="027675009" autoriteSource="Sudoc">Résonance magnétique nucléaire</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Ce travail de thèse s’articule autour de la synthèse de dérivés tellurés, les sels de telluronium, de leur étude à l’état solide et en solution, avec le but de développer des catalyseurs efficaces pour l’organocatalyse.Dans un premier temps, la synthèse de sels de telluronium achiraux a été réalisée et leur aptitude à former des interactions non covalentes basées sur des trous-σ, appelées liaisons chalcogène, a été étudiée aussi bien à l'état solide qu’en solution. En combinant diverses techniques d’analyse, ces investigations ont permis de mieux comprendre la thermodynamique de formation de ces interactions encore peu explorées en solu-tion.De plus, étant donné que la chiralité autour des liaisons chalcogène reste encore inexplorée, la synthèse de sels de telluronium chiraux a également été explorée à travers différentes stratégies, afin d'élargir les possibi-lités dans ce domaine émergeant de la catalyse asymétrique.Enfin, les meilleurs candidats achiraux ont été utilisés en organocatalyse dans quelques réactions (bromation d’aromatiques, halogénation d’alcènes et réaction de Povarov) afin de démontrer leur efficacité en tant qu’organocatalyseurs.</dcterms:abstract>
<dcterms:abstract xml:lang="en">This PhD work focuses on the synthesis of tellurium derivatives, telluronium salts, and their study both in the solid-state and in solution, with the aim to develop efficient catalysts for organocatalysis.First, the synthesis of achiral telluronium salts was performed and their abilities to form non-covalent interactions based on σ-holes, known as chalcogen bonds, were studied both in the solid-state and in solution. By combining various analytical techniques, these investigations provided a better understanding of the thermodynamics behind the formation of these interactions, which remain largely unexplored in solution.Furthermore, since the chirality around chalcogen bonds remains largely unexplored, the synthesis of chiral telluronium salts was also addressed and investigated through various strategies in order to expand the possibilities in this emerging field of asymmetric catalysis.Finally, from solid-state and solution studies, the best achiral candidates were used in organocatalysis for various reactions (bromination of arenes, halogenation of alkenes and the Povarov reaction) to demonstrate their efficiency as organocatalysts.</dcterms:abstract>
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