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<dc:title xml:lang="fr">Synthèse et réactivité de complexes métalliques porteurs de ligands carbéniques N-hétérocycliques fonctionnels</dc:title>
<dcterms:alternative xml:lang="en">Synthesis and reactivity of metal complexes bearing functional N-heterocyclic carbene ligands</dcterms:alternative>
<dc:subject xml:lang="fr">Ligands tritopiques de type pinceur</dc:subject>
<dc:subject xml:lang="fr">Addition oxydante</dc:subject>
<dc:subject xml:lang="fr">Alkylation</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">Tritopic pincer ligands</dc:subject>
<dc:subject xml:lang="en">Oxidative addition</dc:subject>
<dc:subject xml:lang="en">Alkylation</dc:subject>
<dc:subject xml:lang="en">Ethylene oligomerization</dc:subject>
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<tef:elementdEntree autoriteExterne="030024013" autoriteSource="Sudoc">Complexes métalliques</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="167466356" autoriteSource="Sudoc">Carbènes N-hétérocycliques</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="027360105" autoriteSource="Sudoc">Réactions chimiques</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Des ligands hydrides potentiellement bidentes (possédant un donneur N-hétérocyclique (NHC) associé à un groupement donneur éther ou amine) ainsi que des ligands tritopiques de type pinceur (possédant un groupement (NHC) flanqué de deux types de donneurs azotés différents Nimine et Namine) ont été préparés et utilisés pour la coordination de métaux de transition tels que le Ni, Cr, Cu et Ir. L’influence de la longueur de la chaine alkylée -(CH2)2- ou -(CH2)3- reliant le groupe éther ou amine au groupe hétérocyclique (NHC) a été examinée. Dans le but d’accéder aux complexes des métaux de transition différentes méthodologies ont été adoptées : a) déprotonation préalable du sel d’imidazolium suivie de l’addition des précurseurs métalliques correspondants ; b) transmétallation à partir des complexes (NHC) de l’argent correspondants ; c) réaction d’addition oxydante des sels d’imidazolium ou de leurs sels protonés avec du Ni(0). Une série de complexes du Ni(II) et du Cr(III) a été testée dans la réaction catalytique d’oligomérisation de l’éthylène.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Potentially bidentate hybrid ligands (containing a NHC donor associated with an ether or an amine) and tridentate NCN pincer-type ligands (containing a central NHC donor flancked by two chemically-different nitrogen donors (Nimine and Namine)) have been prepared and used for coordination to transition metals, such as Ni, Cr, Cu, Ir. The influence of the length of the alkyl chain, -(CH2)2- or -(CH2)3- connecting the ether or the amine group to the heterocycle NHC was examined. In order to have access to the transition metal complexes, several methodologies were adopted: a) deprotonation of the corresponding imidazolium salts followed by addition of transition metal precursors; b) transmetalation from NHC silver complexes; c) oxidative-addition reaction of Ni(0) with imidazolium salts or the corresponding protonated salts. A series of Ni(II), Cr(III) complexes were tested in the catalytic ethylene oligomerization reaction.</dcterms:abstract>
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