Abstract

The extraordinary catalytic activity of palladium in C C bond forming processes is reviewed in respect to Heck and carbonylation reactions. Examples of catalytic systems based on palladium complexes with phosphorus ligands and phosphine-free systems and based on the Pd(0) colloid are presented. The two key steps of both reaction mechanisms: first, reduction of Pd(II) to Pd(0) complexes or Pd(0) colloids and second, oxidative addition of substrates (aryl or benzyl halides) are discussed.

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