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<dc:title xml:lang="en">Transition metal complexes with N-heterocyclic carbene ligands : synthesis and reactivity</dc:title>
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<dc:subject xml:lang="fr">Carbènes N-hétérocyclique protique</dc:subject>
<dc:subject xml:lang="fr">Fonctionnalité-imine</dc:subject>
<dc:subject xml:lang="fr">Complexes de l'iridium</dc:subject>
<dc:subject xml:lang="fr">Complexes du rhodium</dc:subject>
<dc:subject xml:lang="fr">Activation C-H</dc:subject>
<dc:subject xml:lang="en">Protic N-heterocyclic carbenes</dc:subject>
<dc:subject xml:lang="en">Imine-functionalizations</dc:subject>
<dc:subject xml:lang="en">Iridium complexes</dc:subject>
<dc:subject xml:lang="en">Rhodium complexes</dc:subject>
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<tef:elementdEntree autoriteExterne="167466356" autoriteSource="Sudoc">Carbènes N-hétérocycliques</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="030857589" autoriteSource="Sudoc">Groupe du platine</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">L’objectif de ce travail est la synthèse de complexes contenant des ligands NHC protiques fonctionnalisés avec un groupement imine dans le but de développer des méthodologies de synthèse donnant accès à des ligands pNHC ainsi que la synthèse des groupes imidazolide anioniques liés par le C et leurs complexes homo et hétéro-dinucléaires. Dans le cas des imidazoles sans groupe fonctionnel, la déprotonation à l’aide de n-butyl lithium a permis l’obtention de (1-aryl-1H-imidazol-2-yl)lithium avec de bons rendements. La réaction de (1-aryl-1H-imidazol-2-yl)lithium avec [Ir(cod)(μ-Cl)]2 ou [Rh(cod)(μ-Cl)]2 a conduit à des complexes dinucléaires bipontés en C2,N3. Dans le cas de l’imidazole possédant une fonctionnalité imine, le complexe de l’Ir(I) lié au N de l’imidazole peut se tautomériser en complexe de l’Ir(I) imine avec un ligand pNHC suite à la réaction d’abstraction du chlorure à température ambiante, alors que la tautomérisation de l’analogue du Rh(I) nécessite une température de 110°C. La déprotonation des complexes de l’Ir(I) et Rh(I) liés par le N de l’imidazole avec addition de [Ir(cod)(μ-Cl)]2 ou de [Rh(cod)(μ-Cl)]2 in situ permet l’obtention de complexes homo et hétéro-dinucléaires. La métallation des sels d’imidazolium fonctionnalisés avec un groupement imine s’est avére être une méthode efficace pour la synthèse de complexes métallés ayant un ligand pNHC et a été étendue des complexes bidentes aux complexes chélatants pNHC.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The purpose of this work is the synthesis of complexes containing imine-functionalized protic NHC ligands in order to further develop synthetic methodologies giving access to pNHC, C-bound ‘anionic’ imidazolide, and homo- and heterodinuclear complexes. In the case of imidazoles without functional group, deprotonation with n-butyl lithium afforded (1-aryl-1H-imidazol-2-yl)lithium in good yield. Reaction of (1-aryl-1H-imidazol-2-yl)lithium with [Ir(cod)(μ-Cl)]2 or [Rh(cod)(μ-Cl)]2 yielded a doubly C2,N3-bridged dinuclear complex. In the case of imine-functionalized imidazole, the Ir(I) N-bound imidazole complex can tautomerize to Ir(I) imine-functionalized pNHC complex chloride abstraction at room temperature, while in the Rh(I) analog the tautomerization can be achieved at 110 °C. In situ deprotonation of the N-bound imidazole Ir(I) or Rh(I) complexes, followed by addition of [Ir(cod)(μ-Cl)]2 or [Rh(cod)(μ-Cl)]2 led to the isolation of homo- and heterodinuclear complexes. The metalation of imine-functionalized imidazolium salts is also an effective procedure for synthesis of pNHC metal complexes, and it was extended from bidentate to pincer-type pNHC complexes.</dcterms:abstract>
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