Preparation of recoverable Fe₃O₄@PANI-Pd^II core/shell catalysts for Suzuki carbonylative cross-coupling reactions

We report on the synthesis, characterization and catalytic performance of a palladium-based superparamagnetic catalyst of Fe₃O ₄@polyaniline core/shell microspheres (Fe₃O ₄@PANI-Pd^II). The material was characterized by TEM, FT-IR, vibrating sample magnetometry (VSM), XRD, and XPS. The catalyst showed high activity for the carbonylative cross-coupling reaction of aryl iodide with arylboronic acid. Moreover it could selectively reduce the formation of a direct-coupling product. The newly developed catalyst could be recovered from the liquid phase easily by magnetic separation and recycled 5 times without any significant loss of activity.