This project aims to study and develop a novel principle dedicated to the valorisation of recycled metals, especially palladium. It consists in the direct use of an organic phase arising from a solvent extraction process into organo-catalyzed cross-couplings performed in aqueous micellar phases. The palladium transposition from the organic phase into the aqueous phase is performed thaks to surfactants developed by the CBSA team (C. Pépin & F. Bonneté, IBMM), and which structure has to be optimized to answer to the specifications linked with the hyrometallurgical processes dedicated to palladium recovery from electronic wastes, performed by the LHYS team (D. Bourgeois, ICSM). Following a recent proof of concept involving these both teams from the ChemiSyst LabEx and a third team from the Strasbourg University (F. Bihel), the present project will consist in the rational description of the relationship between the surfactants, easily tunable, the physic-chemical properties resulting from their auto-assembly, and their aptitude to back-extract and stabilize the palladium in the aqueous medium. The fundamental knowledge thus acquired will enable and efficient valorization of the proposed systems.