| Autor: |
Crous, Renier, Datt, Michael, Foster, Douglas, Bennie, Linette, Steenkamp, Casper, Huyser, Johan, KirstenCurrent address: Dept Chemistry, Leo, University, Free State, 9300, Bloemfontein, Africa, South, Steyl, Gideon, Roodt, Andreas |
| Zdroj: |
Dalton Transactions; 2005, Vol. 2005 Issue: 6 p1108-1116, 9p |
| Abstrakt: |
A study has been carried out on rhodium catalyst preforming when modified with the bulky tris2,4-di-tert-butylphenyl phosphite, PObtbp3. X-Ray crystal structure determinations of a tropolone-type precursor complex RhTropBr3COPObtbp3.PObtbp3·CH3COCH3TropBr3 3,5,7-tribromotropolonate and the free PObtbp3ligand are reported. Systematic in situIR and NMR studies of the particular rhodium phosphite modified catalyst and its precursors have led to the identification of two distinct rhodium hydride species. A 1H,31P HMBC NMR experiment afforded clarity on the 31P NMR spectra observed under hydroformylation conditions. The species were identified as HRhCO3PObtbp3 and HRhCO2PObtbp32. Attention was also given to the rate of catalyst formation when starting from different rhodium precursors. |
| Databáze: |
Supplemental Index |
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