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Square-planar dichloro palladium complexes with <i>trans</i>-configurated phosphine ligands avoiding <i>ortho</i>-metallation: Ligand design, complex synthesis, molecular structure and catalytic potential for Suzuki cross-coupling reactions
Auteur(s)
Date de parution
2006
In
Journal of Organometallic Chemistry, Elsevier, 2006/691/20/4257-4264
Résumé
The square-planar palladium complexes trans-[PdCl<sub>2</sub> (PPh<sub>2</sub>-CH<sub>2</sub>-2,4,6-C<sub>6</sub>H<sub>2</sub>Me<sub>3</sub>)<sub>2</sub>] (<b>1</b>) and trans-[PdCl<sub>2</sub> (η<sup>2</sup>-PPh<sub>2</sub>-CH<sub>2</sub>-2,4,6-C<sub>6</sub>HMe<sub>3</sub>-CH<sub>2</sub>-2,4,6-C<sub>6</sub>HMe<sub>3</sub>-CH<sub>2</sub>-PPh<sub>2</sub>)] (<b>2</b>) have been synthesized from [PdCl<sub>2</sub> (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 <i>trans</i> arrangement of the two chlorine and of the two phosphorus atoms. In both cases, <i>ortho</i>-metallation leading to palladacycles is not possible, since all <i>ortho</i> positions in the benzylic rings of <b>1</b> and <b>2</b> are blocked by methyl substituents. Both complexes are found to catalyze Suzuki cross-coupling reactions of deactivated and even bulky arene substrates.
Identifiants
Type de publication
journal article
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