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The catalytic activity of electrochemical deposited Pd nanoparticles on nafion–graphene support was examined for Buchwald–Hartwig amination reaction and Heck coupling reaction. The developed protocol is very efficient and ecofriendly, providing excellent product yield. The Pd/Nf-G catalyst can be used up to four cycles with slight decrease in catalytic activity. [ABSTRACT FROM AUTHOR]

An efficient, ligand free, nano CeO 2 –Fe 3 O 4 catalyzed direct C–H arylation of heteroarenes such as benzoxazole and benzothiazole has been carried out with aryl halides in DMSO or arenediazonium salts in water. The catalyst exhibited high activity with moderate to excellent product yields under mild reaction conditions. Nano CeO 2 –Fe 3 O 4 was synthesized and characterized by SEM, TEM, EDAX, XRD, FTIR, DSC-TGA, and ICP-MS analyses. The catalytic activity and stability of the catalyst were excellent, even after the ten cycle of recyclability [ABSTRACT FROM AUTHOR]