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<dc:title xml:lang="fr">Vers la conception d'une sonde RMN immersible pour le suivi des réactions en solution</dc:title>
<dcterms:alternative xml:lang="en">Towards the design of an immersible NMR probe for solution reaction monitoring</dcterms:alternative>
<dc:subject xml:lang="fr">Système Dip-RMN</dc:subject>
<dc:subject xml:lang="fr">Surveillance des réactions</dc:subject>
<dc:subject xml:lang="fr">Chimométrique</dc:subject>
<dc:subject xml:lang="fr">Quantification</dc:subject>
<dc:subject xml:lang="fr">Données cinétiques</dc:subject>
<dc:subject xml:lang="fr">Hydrosilylation</dc:subject>
<dc:subject xml:lang="en">Dip-NMR system</dc:subject>
<dc:subject xml:lang="en">Reaction monitoring</dc:subject>
<dc:subject xml:lang="en">Chemometric</dc:subject>
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<dc:subject xml:lang="en">Kinetic data</dc:subject>
<dc:subject xml:lang="en">Hydrosilylation</dc:subject>
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<tef:elementdEntree autoriteExterne="027586413" autoriteSource="Sudoc">Spectroscopie de la résonance magnétique nucléaire</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Dans ce travail de thèse nous présentons notre contribution à la mise au point d’un spectromètre RMN immersible miniature à bas-cout (DIP-NMR) permettant de suivre des réactions chimiques directement sous la hotte ou dans les réacteurs industriels. Nous avons pu tester et optimiser la première version d’un prototype enregistrant des spectres à un scan de produit pur, beaucoup de travail reste à faire pour développer une sonde immersible pouvant faire des acquisitions sur plusieurs canaux simultanément.Les premiers spectres obtenus sur notre prototype sont larges et nous avons dû tester et mettre au point des méthodes chimio-métriques pour extraire les données cinétiques et quantitatives. Ces méthodes ont pu être testés sur des données obtenues sur des spectromètres haut champs volontairement dégradés.En parallèle, une série de réactions d’hydrosilylation de substrats organiques (Nitriles, Esters, Amides Cyclique) en présence d’un catalyseur à base d’Ir(III) ont été suivies par RMN à haut champ et haute résolution. Ce travail a permis de mieux comprendre les mécanismes mis en jeu et d’obtenir des données cinétiques de référence pour les tests des prochaines versions de nos spectromètres immersibles.</dcterms:abstract>
<dcterms:abstract xml:lang="en">This endeavour represents a pioneering effort to design and develop a cost-effective low-field Dip-NMR or Immersible NMR system dedicated to monitoring reaction mixtures at the closest possible source of information. While we have successfully designed and optimized the first version of prototype capable of acquiring single scanned NMR spectra of pure samples, further focused study and research are highly warranted to develop and integrate prototype into an immersible probe unit capable of multi-channel acquisition to realize the proposed Dip-NMR system. The NMR spectra obtained from Dip-NMR system were notably broad and necessitated dedicated chemometric methods for quantification and kinetic data extraction. Known reactions were monitored on a high-field high-resolution NMR spectrometer, with the kinetic data from this instrument serving as benchmark data for comparison and evaluation against the data obtained from Dip-NMR system. Various chemometric methods were explored and tested on the mimicked spectra for quantification and kinetic data extraction, with the results subsequently compared with the benchmark data. In parallel with the project’s goal, hydrosilylation reactions involving organic substrates such as nitriles, cyclic amides, and esters were catalyzed using an Ir(III) catalyst and monitored on a high-field high-resolution NMR spectrometer. These investigations have successfully yielded valuable insights into the reactions, contributing to a deeper understanding of the processes involved and laid important reference kinetic data for future testing of an advanced Dip-NMR probe prototype.</dcterms:abstract>
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