Abstract
A new type of polymer-incarcerated (PI) Pd catalyst bearing an active phosphine ligand has been developed. This catalyst was prepared easily according to a conventional PI method (microencapsulation and cross-linking of polymer chains), and TEM images of PI Pd showed the formation of small Pd clusters dispersed on the polymer support without formation of Pd aggregates. The catalyst showed high activity in amination reactions of various aryl chlorides with amines. The reactions proceeded without addition of any external phosphine ligands, and the catalyst was recovered quantitatively by simple filtration and reused at least three times without loss of activity.
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