Suzuki-Miyaura and Hiyama reactions catalyzed by orthopalladated triarylphosphite complexes

Orthometallated, dimeric, and monomeric palladium complexes with triphenylphoshito ligands and square-planar complexes of the type PdCl₂P(OR)₃]₂ (where R=Ph, m-MeC₆H₄, o-MeC₆H₄, C₆H₃-2,4-^tBu₂) were applied in the Suzuki-Miyaura and the Hiyama reactions leading to the same product, 2-Mebiphenyl. The desired product was obtained in high yield in reactions performed in ethane-1,2-diol with Cs₂CO₃ as a base. The optimized procedure was also applied to the synthesis of other biphenyl derivatives, and in most cases the Suzuki-Miyaura procedure led to higher yields of the product.