Organometallic chemistry of the heavier alkaline-earth metal complexes and zirconocene / Romero Fernandez, Nuria  

Public ISBD Titre : Organometallic chemistry of the heavier alkaline-earth metal complexes and zirconocene Type de document : texte imprimé Auteurs : Romero Fernandez, Nuria, Auteur ; Michel Etienne, Directeur de thèse ; Chiara Dinoi, Directeur de thèse Année de publication : 2014 Langues : Anglais (eng) Tags : ALKALINE-EARTH  ORGANOMETALLIC CHEMISTRY  COORDINATION CHEMISTRY  SYNTHESIS  CALCIUM  PERFLUORINATED TP' LIGANDS  BOND ACTIVATION  ZIRCONIUM Résumé : "The first part of the manuscript describes the still underdeveloped chemistry of the heavier Alkaline-Earths (Ae): Ca, Sr and Ba. Catalytic applications of homoleptic and heteroleptic complexes of Ae have been investigated in the last years, heteroleptic complexes being more efficient in the control of the catalytic process. Unfortunatelly, heteroleptic complexes often rearrange to homoleptic towards the Schlenk equilibrium, which can be prevented by chelating, steric stabilizing ligands. Large, electron-withdrawing highly fluorinated tris(indazolyl)borate ligands (TpF) provide the desired steric protection, enhancing at the same time the catalytic activity in the hydroamination of aminoalkenes. Chapter 1 describes homoleptic and heteroleptic complexes TpF 2Ca and TpF CaI with the aim of chosing the adapted ligand. Several heteroleptic silylamido complexes of the formula TpF Ae-N(SiMe2R)2 (Ae = Ca, Sr ; R = Me, H), precatalyst of hydroamination of aminoalkenes have been studied in Chapter 2. The structures often showed interesting agostic interactions. TpF Ca-N(SiMe3)2 is one of the most active precatalyst in cyclohydroamination. Organocalcium compounds containing Ca-alkyl bonds are a rare family. Only a few heteroleptic complexes TpFCa-R (R = alkyl) have been described. Two examples are described in Chapter 3. The second part of the manuscript contains a reactivity study of dicyclopropylzirconocene Cp2Zr(c-C3H5)2 towards small heteroaromatic cycles. C-H bond activation of furan and thiophene, dearomatization of pyridine and C-F bond activation of pentafluoropyridine result from the initial formation of a ?2-cyclopropene intermediate. Mechanistic investigations through kinetics and DFT calculations are provided." Document : Thèse de Doctorat Etablissement_delivrance : Université de Toulouse 3 Date_soutenance : 19/12/2014 Ecole_doctorale : Sciences de la Matière (université Toulouse III P. Sabatier) Domaine : Chimie organométallique de coordination Localisation : LCC En ligne : http://thesesups.ups-tlse.fr/2594/ Organometallic chemistry of the heavier alkaline-earth metal complexes and zirconocene [texte imprimé] / Romero Fernandez, Nuria, Auteur ; Michel Etienne, Directeur de thèse ; Chiara Dinoi, Directeur de thèse . - 2014. Langues : Anglais (eng) Tags : ALKALINE-EARTH  ORGANOMETALLIC CHEMISTRY  COORDINATION CHEMISTRY  SYNTHESIS  CALCIUM  PERFLUORINATED TP' LIGANDS  BOND ACTIVATION  ZIRCONIUM Résumé : "The first part of the manuscript describes the still underdeveloped chemistry of the heavier Alkaline-Earths (Ae): Ca, Sr and Ba. Catalytic applications of homoleptic and heteroleptic complexes of Ae have been investigated in the last years, heteroleptic complexes being more efficient in the control of the catalytic process. Unfortunatelly, heteroleptic complexes often rearrange to homoleptic towards the Schlenk equilibrium, which can be prevented by chelating, steric stabilizing ligands. Large, electron-withdrawing highly fluorinated tris(indazolyl)borate ligands (TpF) provide the desired steric protection, enhancing at the same time the catalytic activity in the hydroamination of aminoalkenes. Chapter 1 describes homoleptic and heteroleptic complexes TpF 2Ca and TpF CaI with the aim of chosing the adapted ligand. Several heteroleptic silylamido complexes of the formula TpF Ae-N(SiMe2R)2 (Ae = Ca, Sr ; R = Me, H), precatalyst of hydroamination of aminoalkenes have been studied in Chapter 2. The structures often showed interesting agostic interactions. TpF Ca-N(SiMe3)2 is one of the most active precatalyst in cyclohydroamination. Organocalcium compounds containing Ca-alkyl bonds are a rare family. Only a few heteroleptic complexes TpFCa-R (R = alkyl) have been described. Two examples are described in Chapter 3. The second part of the manuscript contains a reactivity study of dicyclopropylzirconocene Cp2Zr(c-C3H5)2 towards small heteroaromatic cycles. C-H bond activation of furan and thiophene, dearomatization of pyridine and C-F bond activation of pentafluoropyridine result from the initial formation of a ?2-cyclopropene intermediate. Mechanistic investigations through kinetics and DFT calculations are provided." Document : Thèse de Doctorat Etablissement_delivrance : Université de Toulouse 3 Date_soutenance : 19/12/2014 Ecole_doctorale : Sciences de la Matière (université Toulouse III P. Sabatier) Domaine : Chimie organométallique de coordination Localisation : LCC En ligne : http://thesesups.ups-tlse.fr/2594/

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