Aryl-ester polymers, performance

Various aryl bromides and iodides are suitable for this reaction. The reaction conditions may include microwave irradiation (Table 7, entry 6). It is interesting to note that a Stille coupling can be performed on a polymer-bound halobenzyl ester, which subsequently was cleaved by Pd-catalyzed hydrogenation to give the corresponding substituted methylarenes in the liquid phase (Table 7, entry 8). 

Heck Reactions. The Heck reaction is a Pd-catalyzed olefi-nation usually performed between an aryl halide or triflate and an acrylate ester. While phosphines are traditionally used as ancillary ligands, new Pd(dba)2-mediated reactions have been performed with a variety of other ligand types. These include chelating Wheterocyclic carbene/phosphine ligands, benzimidazoles, and quinolinyl oxazolines. Air stable catalysts have been prepared from Pd(dba)2 and sterically hindered thiourea ligands (eq 24). An effective immobilized catalyst has been prepared from Pd(dba)2 and a dendritic phosphine-containing polymer. ... 

---