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<dc:title xml:lang="fr">Etudes de complexes organométalliques formés par des calixarènes fonctionnalisés par des carbènes N-hétérocycliques</dc:title>
<dcterms:alternative xml:lang="en">Study of organometallic complexes formed by calixarenes functionalized with N-heterocyclic carbenes</dcterms:alternative>
<dc:subject xml:lang="fr">Complexes organométalliques de nickel</dc:subject>
<dc:subject xml:lang="fr">Catalyse</dc:subject>
<dc:subject xml:lang="fr">Réaction de couplage Suzuki-Miyaura</dc:subject>
<dc:subject xml:lang="en">Calixarene</dc:subject>
<dc:subject xml:lang="en">Organometallic nickel complexes</dc:subject>
<dc:subject xml:lang="en">N-heterocyclic carbenes</dc:subject>
<dc:subject xml:lang="en">Catalysis</dc:subject>
<dc:subject xml:lang="en">Suzuki-Miyaura cross coupling</dc:subject>
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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">Une série de calixarènes portant une unité imidazolium ou deux, en conformation cône ont été synthétisés et caractérisés par différentes méthodes. Ces sels chargés positivement constituaient des précurseurs de carbènes N-hétérocycliques pour la synthèse de complexes de nickel correspondants. Les complexes Ni-NHC-calix[4]arènes obtenus ont été testés dans la catalyse de la réaction de couplage croisé de Suzuki-Miyaura. Des moyennes à bonnes conversions ont été obtenues selon l’espacement du centre métallique de la cavité calixarénique, ainsi que le nombre de centre métallique présents sur la même plateforme.</dcterms:abstract>
<dcterms:abstract xml:lang="en">A series of new calix[4]arenes bearing one or two imidazoliums units in the lower rim were synthesized as precursors of N-heterocyclic carbenes for the synthesis of the corresponding nickel complexes. All products obtained were characterized by NMR spectroscopy, microanalysis and mass spectroscopy and was revealed to be in cone conformation. The application of Ni-NHC-calix[4]arene in Suzuki-Miyaura cross coupling showed moderate to good conversions. This is been depending on the length of the alkyl chain and the number of the catalytic centers grafted on the platform.</dcterms:abstract>
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