Graphene-Coated Cobalt Nanoparticles-Supported Palladium Catalyst

Significance

The palladium complex 1 was immobilized on the graphene-coated cobalt nanoparticles via π-π-stacking interaction between pyrene units and the graphene layer. In boiling water, immobilized palladium complex 2 was dissociated to the palladium complex 1 and catalyzed the hydroxycarbonylation of aryl halides to give the corresponding carboxylic acids in up to 95% yield (6 examples). After the reaction, palladium complex 1 was recaptured on graphene layer at room temperature and recovered as palladium complex 2 by magnetic decantation and reused 15 times without significant loss of its catalytic activity.