On the peculiar recycling properties of charcoal-supported palladium oxide nanoparticles in Sonogashira reactions

• Preparation and characterization of Pd NPs/C and PdO NPs/C catalysts.
• Discovery of the peculiar recycling properties of the PdO NPs/C catalyst.
• The work addresses the issue of catalyst deactivation for the Sonogashira reaction.
• Good to high yields of products were obtained with the PdO NPS/C catalyst.
• This work expands the synthetic utility of heterogeneous Pd catalysts.

The enhanced recycling properties of 5% PdO NPs/C compared to 5% Pd NPs/C catalyst for the Sonogashira reaction has been unveiled. A simple preparation procedure for 5% Pd NPs/C and 5% PdO NPs/C catalysts is described along with their extensive characterizations. The correlation between the catalyst deactivation and a high content of reduced palladium species for the alkynylation of aryl iodides has been clearly identified with the monitoring of the Pd(0)/Pd(II) ratio over the recycling runs through X-ray photoelectron spectroscopy.

Figure optionsDownload high-quality image (142 K)Download as PowerPoint slide