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Double HCl elimination and configuration change in the square-planar palladium complex <i>trans</i>-[{(Ph<sub>2</sub>PC<sub>6</sub>H<sub>4</sub>CONH) <sub>2</sub>C<sub>6</sub>H<sub>4</sub>}PdCl<sub>2</sub>] under Suzuki conditions: Isolation and molecular structure of <i>cis</i>-[{(Ph<sub>2</sub>PC<sub>6</sub>H<sub>4</sub>CON)<sub>2</sub>C<sub>6</sub>H<sub>4</sub>}Pd]
Auteur(s)
Date de parution
2006
In
Inorganic Chemistry Communications, Elsevier, 2006/9/12/1151-1154
Résumé
The trans-configurated square-planar palladium complex <i>trans</i>-[{(Ph<sub>2</sub>PC<sub>6</sub>H<sub>4</sub>CONH) <sub>2</sub>C<sub>6</sub>H<sub>4</sub>}PdCl<sub>2</sub>] (<b>1</b>), which catalyzes the Suzuki cross coupling of 4-bromotoluene with phenylboronic acid, was found to react with potassium carbonate in toluene at 90 °C (Suzuki conditions) to give <i>cis</i>-[{(Ph<sub>2</sub>PC<sub>6</sub>H<sub>4</sub>CON)<sub>2</sub>C<sub>6</sub>H<sub>4</sub>}Pd] (<b>2</b>). The single-crystal X-ray structure analysis of 2 reveals the square-planar palladium center to be in a cis configuration. The trans–cis configuration change at palladium is possible because of the elimination of two HCl equivalents in the conversion of <b>1</b> into <b>2</b>. Both complexes <b>1</b> and <b>2</b> show approximately the same catalytic performance for Suzuki reactions, suggesting <b>2</b> to be the catalytically active species.
Identifiants
Type de publication
journal article
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