期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 18, 期 23, 页码 7091-7099出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201200225
关键词
alkenes; coordination modes; hydroformylation; molecular recognition; supramolecular chemistry
资金
- National Research School Combination Chemistry (NRSCC)
- European Union
- Marie-Curie ITN RevCat
In this study we introduce a series of monodentate pyridine-based ligands for which the phosphorus coordination mode to rhodium can be controlled by the binding of ZnII-templates to the pyridyl group. A series of monodentate phosphoroamidite and phosphite ligands have been prepared and studied under hydroformylation conditions by in situ high-pressure NMR and IR techniques. These studies reveal the exclusive formation of rhodium hydride complexes in which the phosphorus atom of the ligand resides in an axial position, trans to the hydride, but only after addition of ZnII-template. In the absence of these templates the usual mono-coordinated rhodium hydrido complexes are formed, with the phosphorus ligated in the equatorial plane, cis to the hydride. The catalytic performance of these complexes is evaluated in asymmetric hydroformylation of unfunctionalised internal alkenes in which the supramolecular change is reflected in higher activity and selectivity.
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