| Autor: |
Meijboom, Reinout, Haumann, Marco, Roodt, Andreas, Damoense, Llewellyn |
| Zdroj: |
Helvetica Chimica Acta; March 2005, Vol. 88 Issue: 3 p676-693, 18p |
| Abstrakt: |
The dinuclear complex [Co2(CO)6{P(O-2,4-t-Bu2C6H3)3}2] (6) has been synthesised and fully characterised. X-Ray crystal-structure analysis revealed a trans-diaxial geometry, no bridging carbonyls, and Co&bond;Co and Co&bond;P bond lengths of 2.706(5) and 2.134(4) 4;Å, respectively. The hydroformylation of pent-1-ene in the presence of 6 was studied at 120–180° at pressures between 20 and 80 4;bar Syngas. High-pressure (HP) spectroscopy (IR, NMR) was used to detect potential hydride intermediates. HP-IR Studies revealed the formation of [CoH(CO)3{P(O-2,4-t-Bu2C6H3)3}] (2) at ca. 105°, with no significant amount of [CoH(CO)4] detectable. The intermediate 2 was synthesised and characterised. The formation of the undesired complex [CoH(CO)2{P(O-2,4-t-Bu2C6H3)3}2] was completely suppressed due to the large cone angle of the sterically demanding phosphite. |
| Databáze: |
Supplemental Index |
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