Immobilization of homogeneous catalysts on nanoparticles and their application in semi-heterogeneous catalysis

TL;DRAbstract

It was the aim of this work to develop a generally applicable strategy for the immobilization of catalysts on different nanoparticles with particular interest in the �heterogenization� of chiral azabis(oxazolines), which represent a predestined class of ligands for the grafting on solid supports due to their central nitrogen atom. To this end, a copper(I)-catalyzed azide/alkyne cycloaddition (CuAAC) reaction was envisaged to be the most versatile tagging method, allowing even the use of preformed transition-metal complexes after according derivatization with an alkyne moiety. Such a route was expected to provide distinct advantages over the in-situ complexation by adding the equivalent amount of metalsalt to the immobilized ligand, since the exact determination of ligand loading is challenging. This issue was aggravated by recent investigations from Reiser et al., indicating that not only an excess of transition metal has a detrimental effect on the optical yields attained, but also a

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