We are working on the development of catalysts for biphasic organic reactions (epoxidations, cyclopropanations, CO₂ valorization, hydrogenations, etc.). We use molecular surface-active ionic liquid (SAIL) catalysts, which aggregate in solution via supramolecular interactions, e.g. as micelles in water. The self-assembled supramolecular aggregates serve as host matrices for both the catalyst and the substrate, thus acting as “nanoreactors”. Our goal is to design multifunctional catalysts with modulated functionality and geometry to optimize the activity and to understand and control the product selectivity. Long-term stability and reusability of the SAIL catalysts is a particular focus aiming at applicability beyond the lab scale.