The recyclability of the catalysis using Pd NCs@COF catalysts was investigated, as shown in Figure . All runs were performed under identical reaction conditions. As a heterogeneous Pd NCs@COF catalyst, the solid catalyst can be easily separated via filtration or centrifugation after each run, washed with ethanol, and dried for the next catalytic run. The catalytic conversion is over 95% even after the 4 th cycle, suggesting excellent recyclability of Pd NCs@COF catalysts.