The applicability of micellar solvent systems as tuneable multiphase reaction media for homogeneous catalysis is being examined within the framework of the collaborative research centre SFB/TRR 63 InPROMPT (Integrated Chemical Processes in Liquid Multiphase Systems). In this contribution the equilibrium distribution of four representative ligands in different aqueous-micellar systems was investigated and the dependency of their distribution - and thereby the distribution of a homogeneously dissolved catalyst - in the different phases of these multiphase systems is discussed. The knowledge of the distribution coefficients is of utmost importance for an efficient and quantitative catalyst recycling in aqueous-micellar systems.