Chitosan-Based Magnetic Polymetallic Pd-Catalysts for Heck Reaction in Aqueous Media

A mechanochemical method was developed for the synthesis of ferromagnetic Pd–Fe–Co–Ni composites based on the natural biopolymer chitosan, which are highly efficient catalysts for the Heck reaction in aqueous media in the presence of an ionic liquid and can be readily extracted with an external magnet for reuse in catalysis.