SCHEDULED MAINTENANCE
Intercalated polyfluorinated Pd complexes in α-zirconium phosphate for Sonogashira and Heck reactions†
Abstract
During our exploration, we have found that fluorous metal complexes can be readily and directly intercalated into α-zirconium phosphate (ZrP) layered compound. The interlayer distance of neat ZrP is 7.6 Å. After the uptake of polyfluorinated Pd complexes, the original 7.6 Å interlayer distance was increased to ca. 10.6 Å, suggesting the successful intercalation of polyfluorinated Pd complexes within the ZrP galleries. The reason why polyfluorinated Pd complexes can be readily intercalated into ZrP is probably owing to the formation of hydrogen bonds between the hydroxyl groups of ZrP and the fluorous segments of the metal complexes. The intercalation of polyfluorinated Pd complexes into ZrP converted the metal complexes to heterogeneous catalysts, which were evaluated for Sonogashira and Heck reactions. Such intercalation compounds exhibited high performance in terms of both yield and recyclability, which suggested that intercalation into layered compounds (such as ZrP) can be a promising route to form heterogeneous catalysts for polyfluorinated metal complexes for various reactions.
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