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<dc:title xml:lang="fr">Étude en solution des interactions basées sur un trou-σ : conception, synthèse et applications de nouveaux donneurs de liaison halogène et chalcogène</dc:title>
<dcterms:alternative xml:lang="en">Study of σ-hole interactions in solution : design, synthesis and applications of new halogen and chalcogen bond donors</dcterms:alternative>
<dc:subject xml:lang="fr">Catalyse homogène</dc:subject>
<dc:subject xml:lang="fr">Liaison halogène / chalcogène</dc:subject>
<dc:subject xml:lang="fr">Interaction non covalente basée sur un trou-σ</dc:subject>
<dc:subject xml:lang="fr">Interaction tellure-fluor</dc:subject>
<dc:subject xml:lang="fr">Couplage à travers l'espace</dc:subject>
<dc:subject xml:lang="en">Homogenous catalysis</dc:subject>
<dc:subject xml:lang="en">Halogen / chalcogen bond</dc:subject>
<dc:subject xml:lang="en">Σ-hole based non covalent interaction</dc:subject>
<dc:subject xml:lang="en">Tellurium-fluorine interaction</dc:subject>
<dc:subject xml:lang="en">Through space coupling</dc:subject>
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<dcterms:abstract xml:lang="fr">Ce travail de thèse s’articule autour de la synthèse de nouveaux donneurs de trous-σ, leur étude en solution ainsi que leur mise en application en organocatalyse.Dans un premier temps, l’aptitude des chalcogènes (soufre, sélénium et tellure) à former des interactions non covalentes basées sur un trou-σ a été étudiée en solution. Pour cela, une étude par chromatographie en phase liquide à haute performance sur phase stationnaire chirale avec des 4,4’-bipyridines soufrées et séléniées a été réalisée pour montrer la présence de liaison chalcogène stéréosélective en solution. De plus, une autre étude par spectroscopie de résonance magnétique nucléaire a été menée afin de mettre cette fois-ci en lumière la présence de liaisons chalcogène basées sur l’atome de tellure dans différents composés organotellurés.Enfin, à partir de leur étude en solution, les meilleurs donneurs de trou-σ ont été utilisés en organocatalyse dans diverses réactions (bromation, bromocyclisation, aza-Diels-Alder, Ritter) afin de démontrer leur efficacité en tant qu’organocatalyseur.</dcterms:abstract>
<dcterms:abstract xml:lang="en">This PhD work is articulated around the synthesis of new σ-holes donors, their study in solution and their practical use in chemistry such as orgnanocatalysis.Initially, chalcogen ability to form σ-hole based non covalent interactions was studied in solution. A study was performed with chalcogenated 4,4’-bipyridines by using high-performance liquid chromatography and chiral stationary phase, in order to detect stereoselective chalcogen bonding in solution. Furthermore, a second study was performed with organotellurium compounds by using nuclear magnetic resonance spectroscopy.Finally, based on results previously observed in solution, best σ-hole donors were used in organocatalysis in various reactions (bromination, bromocyclization, aza-Diels-Alder, Ritter) to demonstrate their efficiency as organocatalysts.</dcterms:abstract>
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