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<dc:title xml:lang="en">Development of organometallic complexes bearing sulfur-functionnalized N-heterocyclic carbene ligands and their applications in catalysis</dc:title>
<dcterms:alternative xml:lang="fr">Développement de complexes organométalliques portant des ligands Carbène N-hétérocyclique fonctionnalisés par du soufre et leurs applications en catalyse</dcterms:alternative>
<dc:subject xml:lang="fr">Carbènes N-hétérocycliques</dc:subject>
<dc:subject xml:lang="fr">Thioether</dc:subject>
<dc:subject xml:lang="fr">Sulfoxyde</dc:subject>
<dc:subject xml:lang="fr">Ruthenium</dc:subject>
<dc:subject xml:lang="fr">Catalyse</dc:subject>
<dc:subject xml:lang="fr">Emprunt d’hydrogène</dc:subject>
<dc:subject xml:lang="fr">Chimie de coordination</dc:subject>
<dc:subject xml:lang="en">N-heterocyclic carbenes</dc:subject>
<dc:subject xml:lang="en">Thioether</dc:subject>
<dc:subject xml:lang="en">Sulfoxide</dc:subject>
<dc:subject xml:lang="en">Ruthenium</dc:subject>
<dc:subject xml:lang="en">Catalysis</dc:subject>
<dc:subject xml:lang="en">Hydrogen borrowing</dc:subject>
<dc:subject xml:lang="en">Coordination chemistry</dc:subject>
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<tef:elementdEntree autoriteExterne="029727332" autoriteSource="Sudoc">Composés organométalliques</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="031153844" autoriteSource="Sudoc">Ligands</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="027993884" autoriteSource="Sudoc">Catalyse homogène</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="167466356" autoriteSource="Sudoc">Carbènes N-hétérocycliques</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">La chimie des ligands NHC (carbènes N-hétérocycliques) avec groupement donneur (type héréoatome) a attiré l’attention de multiples groupes de recherche depuis plusieurs décennies. Bien que des groupes phosphore, azote et oxygène aient été bien étudiés, les NHC fonctionnalisés par du soufre restent moins explorés mais montrent un intérêt croissant en catalyse. Cette thèse explore la chimie de ligands de type NHC fonctionnalisés par du soufre (thioether ou sulfoxyde), ainsi que leurs complexes de ruthénium pour des applications en catalyse. En particulier, ils catalysent la β alkylation d’alcools avec une sélectivité élevée, notamment grâce à un mécanisme d’emprunt d’hydrogène. Les complexes NHC-sulfoxyde montrent une stabilité et une diastéréosélectivité accrues, ouvrant la voie à des applications en catalyse asymétrique. En conclusion, la modification des ligands NHC par du soufre améliore la stabilité et la sélectivité catalytique, offrant un potentiel prometteur pour le développement de catalyseurs énantiosélectifs.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The chemistry of N-heterocyclic carbene (NHC) ligands with donor groups (heteroatom) has gained attention of many research groups over recent decades. While phosphorus, nitrogen, and oxygen-containing NHCs are well-studied, sulfur-functionalized NHCs (S-NHCs) remain less explored but increasingly promising for catalysis. This thesis explores the chemistry of sulfur-functionalized NHC ligands (thioether or sulfoxide) and their ruthenium complexes for catalytic applications. They catalyze the β-alkylation of alcohols with high selectivity, especially through a borrowed hydrogen mechanism. The NHC-sulfoxide complexes exhibit enhanced stability and diastereoselectivity, paving the way for applications in asymmetric catalysis. In conclusion, sulfur-modified NHC ligands improve stability and catalytic selectivity, presenting promising potential for developing enantioselective catalysts.</dcterms:abstract>
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