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Al2O3-supported Pd nanoclusters with an average particle size
of 1.8 nm act as a heterogeneous catalyst for the cross-coupling
of amines, providing the first example of a reusable Pd catalyst
for cross-coupling of amines both of which are able to undergo
dehydrogenation. The reaction is a structure-sensitive reaction,
demanding coordinatively unsaturated Pd atoms on the metallic
nanocluster. The support also affects the activity, and the
amphoteric oxide (Al2O3) gives the highest activity.
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