Table of Contents
Molecules, Volume 24, Issue 15 (August-1 2019)
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Cover Story (view full-size image) A new G-(H2L)-Pd heterogeneous catalyst has been prepared via a self-assembly process consisting of [...] Read more. A new G-(H2L)-Pd heterogeneous catalyst has been prepared via a self-assembly process consisting of the spontaneous adsorption of a macrocyclic H2L ligand onto graphene (G) (G + H2L = G-(H2L)) in water at room temperature, followed by decoration of the macrocycle with Pd2+ ions (G-(H2L) + Pd2+ = G-(H2L)-Pd) under the same mild conditions. This supramolecular approach is a sustainable (green) procedure that preserves the special characteristics of graphene while furnishing an efficient catalyst for use in the Cu-free Sonogashira cross-coupling reaction between iodobenzene and phenylacetylene. Indeed, G-(H2L)-Pd shows excellent conversion (90%) of reactants into diphenylacetylene under mild conditions (50 °C, water, aerobic atmosphere, 14 h). The catalyst proved to be reusable for at least four cycles, although decreasing yields of down to 50% were observed.