Pd supported on Cu-doped Ti-pillared montmorillonite as catalyst for the Ullmann coupling reaction

The preparation and characterization of Pd/montmorillonite supported catalysts and their application in the O-, N-, and S-arylation through Ullmann coupling reaction were reported. The catalysts consisted of Pd supported on raw montmorillonite and on a Cu-doped Ti-pillared montmorillonite, and were prepared via impregnation of the clay supports with a Pd-precursor by the incipient wetness method. The catalysts were found to be effective and gave good to excellent yield in the arylation reactions. The catalyst based on the PILC was reusable and gave good yield up to three cycles of reaction.