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New aryl phosphinite ligands avoiding <i>ortho</i>-metallation: Synthesis and molecular structures of <i>trans</i>-[PdCl2(PPh2OR)2] and <i>trans</i>-[Rh(CO)Cl(PPh<sub>2</sub>OR) <sub>2</sub>] (R = 2,4,6-Me<sub>3</sub>C<sub>6</sub>H<sub>2</sub>; 2,6-Ph<sub>2</sub>C<sub>6</sub>H<sub>3</sub>)
Auteur(s)
Date de parution
2005
In
Inorganica Chimica Acta, Elsevier, 2005/358/12/3417-3422
Résumé
The new aryl phosphinites PPh2OR (R = 2,4,6-Me<sub>3</sub>C<sub>6</sub>H<sub>2</sub>, <b>1</b>; R = 2,6-Ph<sub>2</sub>C<sub>6</sub>H<sub>3</sub>, <b>2</b>) have been prepared from chlorodiphenylphosphine and the corresponding phenols. In these ligands, the <i>ortho</i>-positions of the aromatic phosphite function are blocked by methyl and phenyl substituents, which allows coordination to metal centres without <i>ortho</i>-metallation. Thus, reaction with [PdCl<sub>2</sub> (cod)] leads to the complexes <i>trans</i>-[PdCl<sub>2</sub> (PPh<sub>2</sub>OR)<sub>2</sub>] (R = 2,4,6-Me<sub>3</sub>C<sub>6</sub>H<sub>2</sub>, <b>3</b>; R = 2,6-Ph<sub>2</sub>C<sub>6</sub>H<sub>3</sub>, <b>4</b>), while the reaction with [Rh<sub>2</sub> (CO)<sub>4</sub>Cl<sub>2</sub>] gives <i>trans</i>-[Rh(CO)Cl(PPh<sub>2</sub>OR)2] (R = 2,4,6-Me<sub>3</sub>C<sub>6</sub>H<sub>2</sub>, <b>5</b>; R = 2,6-Ph<sub>2</sub>C<sub>6</sub>H<sub>3</sub>, <b>6</b>). The single-crystal X-ray structure analyses of <b>3</b> and <b>5</b> confirm the trans-coordination of the new ligands in these square-planar complexes.
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Type de publication
journal article
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