Abstract The cover picture shows the concept of operating a homogeneous catalyst under continuous operation conditions: The recycling of molecular‐weight‐enlarged transition‐metal complexes by suitable filtration methods and equipment in order to combine the advantages of both classical homogeneous and heterogeneous catalysis. Various aspects of molecular‐weight enlargement and immobilization of catalysts, and recent developments, are reported in the Microreview by D. Vogt et al. on p. 4011 ff.