The reversible storage of hydrogen through the intermediate formation of formic acid (FA) is a pr... more The reversible storage of hydrogen through the intermediate formation of formic acid (FA) is a promising solution to its safe transport and distribution. However, the common necessity of using base...
Ce travail presente la synthese de ligands mixtes germylene-sulfoxyde qui ont ete utilises en chi... more Ce travail presente la synthese de ligands mixtes germylene-sulfoxyde qui ont ete utilises en chimie de coordination avec plusieurs metaux de transitions et finalement appliques en catalyse de transfert d'hydrogene. Une seconde partie de ce travail est axee sur la synthese de nouveaux metallylenes stabilises par un sulfonimidamide qui ont ete appliques en catalyse de polymerisation. Le premier chapitre presente l'etat de l'art des germylenes avec leurs syntheses, modes de stabilisations et finalement leur chimie de coordination et leurs applications en catalyse. Les sulfoxydes seront aussi decrits pour leur application en tant que ligands hemilabiles. Le second chapitre decrit la synthese de ligands germylene-α-sulfoxide avec une diversite structurale (cyclohexyle, tBu, tolyle..) et avec differents degres d'oxydation du souffre (thioether, sulfoxyde et sulfone). La chimie de coordination a permis la synthese de complexes bis-germylene du groupe IV, bidentes du ruthen...
Copper(i) complexes featuring N-heterocyclic carbenes (NHCs) in which the nitrogen atoms are subs... more Copper(i) complexes featuring N-heterocyclic carbenes (NHCs) in which the nitrogen atoms are substituted by a 9-ethyl-9-fluorenyl group (EF) have been synthesised and tested in the hydrosylilation of functionalized and/or sterically demanding ketones and aldehydes. These reactions, carried out with triethylsilane as hydride source, were best achieved with the imidazolylidene copper complex in which the EF substituents can freely rotate about the corresponding N-CEF bonds. The remarkable stability of the active species, which surpasses that of previously reported Cu-NHC catalysts is likely to rely on the ability of the NHC side arms to protect the copper centre during the catalytic cycle by forming sandwich-like intermediates, but also on its steric flexibility facilitating approach of encumbered substrates. TONs up to 1000 were reached.
The reversible storage of hydrogen through the intermediate formation of formic acid (FA) is a pr... more The reversible storage of hydrogen through the intermediate formation of formic acid (FA) is a promising solution to its safe transport and distribution. However, the common necessity of using base...
Ce travail presente la synthese de ligands mixtes germylene-sulfoxyde qui ont ete utilises en chi... more Ce travail presente la synthese de ligands mixtes germylene-sulfoxyde qui ont ete utilises en chimie de coordination avec plusieurs metaux de transitions et finalement appliques en catalyse de transfert d'hydrogene. Une seconde partie de ce travail est axee sur la synthese de nouveaux metallylenes stabilises par un sulfonimidamide qui ont ete appliques en catalyse de polymerisation. Le premier chapitre presente l'etat de l'art des germylenes avec leurs syntheses, modes de stabilisations et finalement leur chimie de coordination et leurs applications en catalyse. Les sulfoxydes seront aussi decrits pour leur application en tant que ligands hemilabiles. Le second chapitre decrit la synthese de ligands germylene-α-sulfoxide avec une diversite structurale (cyclohexyle, tBu, tolyle..) et avec differents degres d'oxydation du souffre (thioether, sulfoxyde et sulfone). La chimie de coordination a permis la synthese de complexes bis-germylene du groupe IV, bidentes du ruthen...
Copper(i) complexes featuring N-heterocyclic carbenes (NHCs) in which the nitrogen atoms are subs... more Copper(i) complexes featuring N-heterocyclic carbenes (NHCs) in which the nitrogen atoms are substituted by a 9-ethyl-9-fluorenyl group (EF) have been synthesised and tested in the hydrosylilation of functionalized and/or sterically demanding ketones and aldehydes. These reactions, carried out with triethylsilane as hydride source, were best achieved with the imidazolylidene copper complex in which the EF substituents can freely rotate about the corresponding N-CEF bonds. The remarkable stability of the active species, which surpasses that of previously reported Cu-NHC catalysts is likely to rely on the ability of the NHC side arms to protect the copper centre during the catalytic cycle by forming sandwich-like intermediates, but also on its steric flexibility facilitating approach of encumbered substrates. TONs up to 1000 were reached.
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Papers by Nicolas Lentz