Immobilization of Ruthenium-Triphos Catalysts and their Application for the Hydrogenation of Polar B

The present thesis deals with the development of immobilized Ruthenium-Triphos catalysts for the selective hydrogenation of esters, amides and CO2 as potential substrates in the context of the valorization of renewable carbon resources.

The highly active molecular catalyst [Ru(Triphos)TMM] (C-1a), already investigated in various catalytic approaches and mechanistic studies, was defined as target structure for immobilization. In a detailed preparative study, two synthetic pathways towards [(Ru(Ether-Triphos)TMM] (C-2a) and [(Ru(Carbamate-Triphos)TMM] (C-3a) were developed, using a triethoxysilyl-functionality as anchoring-group in the catalysts backbone, enabling the covalent immobilization on oxidic supports (section 3.1). Subsequently, the complex [(Ru(Ether-Triphos)TMM] (C-2a) was tethered on amorphous SiO2,500, leading to the heterogenized catalyst [(Ru(Ether-Triphos)TMM]@SiO2,500 (C-2b, section 3.1).

The immobilized catalyst was successfully tested in ester-, amide-