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Issue 18, 2008
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Dendritic effects in catalysis by Pd complexes of bidentate phosphines on a dendronized support: Heck vs.carbonylation reactions

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Abstract

Bidentate phosphine ligands have been prepared on polystyrene beads modified with polyether dendron spacers. When complexed to Pd0, these systems exhibited a negative dendritic effect on Heck catalysis (contrary to the analogous monodentate phosphine systems), but mostly a positive influence on carbonylation. This opposite influence of the dendronization falls into line with other differences in the optimal ligand structure for the two reactions. The negative effect on the Heck catalysis with bidentate phosphines may indicate that dendrimer-induced reduction in the cross-linking upon Pd complexation is responsible for the positive effect in the corresponding monodentate phosphine systems.

Graphical abstract: Dendritic effects in catalysis by Pd complexes of bidentate phosphines on a dendronized support: Heck vs.carbonylation reactions

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Article information


Submitted
09 Jun 2008
Accepted
25 Jun 2008
First published
25 Jul 2008

Org. Biomol. Chem., 2008,6, 3382-3387
Article type
Paper

Dendritic effects in catalysis by Pd complexes of bidentate phosphines on a dendronized support: Heck vs.carbonylation reactions

A. Mansour, T. Kehat and M. Portnoy, Org. Biomol. Chem., 2008, 6, 3382
DOI: 10.1039/B809715A

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