Silica-supported polymeric palladium (0) complexes as catalysts for Heck reaction in organic synthesis

Silica-supported palladium (0) complexes have been prepared from γ-chloropropyl triethoxysilica and γ-aminopropyl triethoxysilica via immobilization on fumed silica, followed by reacting with ethylenediamine and salicylaldehyde, and then the reaction with palladium chloride in ethanol and reduction with KBH 4 in ethanol. They are efficient catalysts for Heck reaction of aryl iodides with alkene at 90 o C. These polymeric palladium (0) catalysts can be recovered and reused without loss in activity.