Catalyseurs d’hydrosilylation pour la réduction de liaisons C-O dans les polymères oxygénés

Abstract : The main objective of this thesis is the development of new efficient catalytic systems for the depolymerization of biomass and plastics. The chosen strategy to promote such transformations was the hydrosilylation of C-O bonds. Brookhart's iridium(III) catalyst was found to be very effective for hydrosilylation of lignin leading to pure aromatic products isolated in very high yields. It was also used for the reductive depolymerization of oxygenated plastics, allowing the isolation of monomers and valuable chemicals.In a second step, a "greener" depolymerization of polycarbonates and polyesters was implemented. This does not involve metals or solvents through the use of tetra-n-butyl amonium fluoride as a catalyst for hydrosilylation. Finally, depleted uranium, considered as a waste product of the nuclear industry, was valorized as a catalyst for the reduction of C-O bonds. It has been discovered that a uranyl(VI) triflate complex efficiently promotes reductive coupling of the aldehyde in the presence of hydrosilanes leading to symmetric ethers.
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Louis Monsigny. Catalyseurs d’hydrosilylation pour la réduction de liaisons C-O dans les polymères oxygénés. Catalyse. Université Paris-Saclay, 2019. Français. ⟨NNT : 2019SACLS026⟩. ⟨tel-02129387⟩

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