Faculté des sciences

Square-planar dichloro palladium complexes with trans-configurated phosphine ligands avoiding ortho-metallation: Ligand design, complex synthesis, molecular structure and catalytic potential for Suzuki cross-coupling reactions

Chahen, Ludovic ; Therrien, Bruno ; Süss-Fink, Georg

In: Journal of Organometallic Chemistry, 2006, vol. 691, no. 20, p. 4257-4264

The square-planar palladium complexes trans-[PdCl2 (PPh2-CH2-2,4,6-C6H2Me3)2] (1) and trans-[PdCl2 (η2-PPh2-CH2-2,4,6-C6HMe3-CH2-2,4,6-C6HMe3-CH2-PPh2)] (2) have been synthesized from... Plus

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    Summary
    The square-planar palladium complexes trans-[PdCl2 (PPh2-CH2-2,4,6-C6H2Me3)2] (1) and trans-[PdCl22-PPh2-CH2-2,4,6-C6HMe3-CH2-2,4,6-C6HMe3-CH2-PPh2)] (2) have been synthesized from [PdCl2 (cod)] (cod = 1,5-cyclooctadiene) and the corresponding new phosphine or diphosphine ligands. The single-crystal X-ray structure analysis reveals for both complexes a trans arrangement of the two chlorine and of the two phosphorus atoms. In both cases, ortho-metallation leading to palladacycles is not possible, since all ortho positions in the benzylic rings of 1 and 2 are blocked by methyl substituents. Both complexes are found to catalyze Suzuki cross-coupling reactions of deactivated and even bulky arene substrates.