Abstract

Combination of 3,5-dimethyl-1-(2-(diphenylphosphino)phenyl)-1 H-pyrazole, A, and 3- tert-butyl-5-methyl-1-(2-(diphenylphosphino)phenyl)-1 H-pyrazole, B, with Pd 2(dba) 3 furnished excellent catalysts for Stille, Kumada and Hiyama cross-coupling reactions. Effects of solvents, bases and ligand/palladium ratio on efficiency of coupling reactions were studied. Molecular structures of palladium(II) complexes of A and B determined by single-crystal X-ray diffraction method revealed a close similarity of ligand arrangement around the metal centre.

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