The Pauson-Khand-Type Reaction Catalyzed by Transition Metal Nanoparticles

In this account, we survey our work on the use of transition metal nanoparticles as catalysts in Pauson-Khand-type reactions. Cobalt nanoparticles and Co/Ru, Co/Rh, and Co/Pd heterobimetallic nanoparticles have been used in Pauson-Khand-type reactions and related tandem reactions. In the case of Co/Ru nanoparticles, pyridylmethylformate can be used instead of carbon monoxide. We have developed environmentally friendly processes. The use of Co/Rh heterobimetallic nanoparticles allows the development of a new type of [2+2+1] cycloaddition of an (alpha),(beta)-unsaturated aldehyde with an alkyne.