Homogeneous Stabilization of Pt Nanoparticles in Dendritic Core-Multishell Architectures: Application in Catalytic Hydrogenation Reactions and Recycling

Core–multishell architectures are a new approach to homogeneously stabilize metal nanoparticles for harsh conditions. Herein, we present the synthesis and stabilization of Pt nanoparticles in dendritic core–multishell polymers and their application in hydrogenation reactions. The successful recycling of the catalyst was demonstrated for the hydrogenation of methyl crotonate 1 and was either achieved by ultrafiltration or in a two‐phase system for at least 14 cycles. Thereby, the total turnover number (TON) was increased to 22 000. In the recycling experiments, low metal leaching into the product (as low as 0.3 ppm) was detected. Additionally, the selective hydrogenation of isophorone 3 was investigated and selectivities of 99:1 for CC versus CO hydrogenation were achieved. Cores and effect: The synthesis and stabilization of Pt nanoparticles in dendritic core–multishell polymers and their application to hydrogenation reactions are described. The catalyst is reused 14 times (total TON=22 000) and can be recovered by ultrafiltration or phase separation with very low metal leaching into the product.