Construction Kit for the Solvent Selection in Homogeneous Catalyzed ReactionsChoosing the right solvent for chemical syntheses is often the base for a successful large-scale implementation. Especially in homogeneous transition metal catalyzed reactions, the solvent can be the limiting factor in issues of catalyst recycling and product separation. This review presents possible solvent types for chemical synthesis and which tools can be used to select a suitable one. A view at new solvents will be taken, possible concepts of catalyst recycling will be explained and the concept of the green solvents will be discussed.