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<dc:title xml:lang="en">Oxygen-functionalized NHC ligands and their nickel(II), silver(I) and palladium(II) complexes</dc:title>
<dcterms:alternative xml:lang="fr">Carbènes N-hétérocycliques possédant une fonction oxygénée et leurs complexes de nickel(II), argent(I) et palladium(II)</dcterms:alternative>
<dc:subject xml:lang="fr">Carbènes N-hétérocycliques</dc:subject>
<dc:subject xml:lang="fr">Fonctionnalisations oxygénées</dc:subject>
<dc:subject xml:lang="fr">Complexes organométalliques</dc:subject>
<dc:subject xml:lang="fr">Oligomérisation de l’éthylène</dc:subject>
<dc:subject xml:lang="en">N-heterocyclic carbenes</dc:subject>
<dc:subject xml:lang="en">Oxygen-functionalizations</dc:subject>
<dc:subject xml:lang="en">Organometallic complexes</dc:subject>
<dc:subject xml:lang="en">Ethylene oligomerization</dc:subject>
<dc:subject xsi:type="dcterms:DDC">546</dc:subject>
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<tef:elementdEntree autoriteExterne="027618706" autoriteSource="Sudoc">Métaux de transition</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="030284295" autoriteSource="Sudoc">Oxygène -- Composés organiques</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">L’objectif de cette thèse portait sur la synthèse de complexes portant un ligand NHC associé à une fonction oxygénée et à leur application en catalyse d’oligomérisation de l’éthylène. Dans le but de synthétiser des complexes avec des ligands NHCalcool, les complexes d’argent correspondants ont été synthétisés et utilisés en transmétallation. Aucun résultat concluant n’a pu être obtenu avec le nickel à cause de l’acidité du proton alcoolique. Mais un ligand NHC-alcoolate a pu être obtenu par déprotonation directe du pro-ligand avec une base forte. Il fut alors possible d’accéder à des complexes de nickel polynucléaires, certains incorporant dans leur structure des cations lithium provenant de la base utilisée. Par comparaison, des complexes de palladium ont été synthétisés avec des NHCs-alcool ou -alcoolate par réaction des pro-ligands avec Pd(acac)2 suivie de réactions acido-basiques. Etant donné la difficulté d’obtention des complexes de nickel avec des ligands NHC-alcool, la fonction éther a été étudiée. Les complexes résultants ont été testés en oligomérisation de l’éthylène.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The purpose of this work was the synthesis of complexes bearing O-functionalized NHC ligands in order to test their catalytic properties in ethylene oligomerization. In order to have access to alcohol-functionalized complexes, the corresponding silver complexes were synthesized for transmetallation purpose. Whereas no concluding results were obtained with the alcohol function in association with nickel, it was possible to access an alcoholate-functionalized NHC ligand by deprotonation of the corresponding pro-ligand. Thus, polynuclear nickel complexes were prepared, some of them included in their structure a lithium cation originating from the base. For comparison, alcohol- and alcoholate-functionalized NHC palladium complexes were synthesized by direct reaction of the pro-ligand with Pd(acac)2 followed by acidobasic reactions. Because of the complexity of the chemistry of NHC-alcohol ligands associated with nickel, the ether functionality was explored. A library of nickel complexes was synthesized and tested in the catalytic ethylene oligomerization.</dcterms:abstract>
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