Optimized Batchwise and Continuous Microreactor Synthesis of a (Bathophenanthroline)ruthenium(II) Complex Carrying Different Ligands

By changing the Ru‐source, the reaction conditions, and the workup/purification procedure, the batchwise synthesis of a mixed [Ru II (bathophenanthroline)] complex, i.e. , of 4b , could substantially be improved (bathophenanthroline=4,7‐diphenyl‐1,10‐phenanthroline). In addition, we were able to adapt both steps of the synthesis to a microreactor system leading to the desired Ru‐complex in a continuous preparation in very high yields. The latter approach is especially suited for an envisaged scale‐up.