| Autor: |
Holland, A. W., Glueck, D. S., Bergman, R. G. |
| Zdroj: |
Organometallics; May 2001, Vol. 20 Issue: 11 p2250-2261, 12p |
| Abstrakt: |
Coordinatively unsaturated pentamethylcyclopentadienyl pinacolate complexes of the group 9 transition metals (4−6) have been prepared and characterized. Photolysis of either the cobalt complex 4 or the rhodium complex 5 results in cleavage of the central carbon−carbon bond in the diolate, generating acetone. Various trapping studies demonstrate that an intact [Cp*M] fragment is produced in these reactions, and in the absence of added traps this fragment reacts either with aromatic solvents or with an intact molecule of the starting pinacolate complex. The oxidation of the resulting rhodium(II) product 11 by air (or O2) in the presence of pinacol regenerates the rhodium(III) pinacolate complex 5. Photolysis of rhodium complex 5 in the presence of pinacol and oxidant (either O2 or N2O) results in the catalytic conversion of pinacol to acetone. |
| Databáze: |
Supplemental Index |
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