| 摘要 |
The invention relates to the use of compounds of the general formula R<1>aRebOc in which a is 1 to 6, b is 1 to 4 and c is 1 to 14, and the total of a, b and c is appropriate for the 5- to 7-valency of rhenium, with the proviso that c is not greater than 3xb, and in which R<1> is an alkyl radical with 1 to 9 C atoms, a cycloalkyl radical with 5 to 10 C atoms or an aralkyl radical with 7 to 9 C atoms, where R<1> can be at least partially fluorinated, the compounds do not contain more than three groups with more than 6 C atoms per rhenium atom, and at least one hydrogen atom is still bonded to the C atom in the alpha position, which are applied to oxide support materials as catalysts for the metathesis of olefinic compounds. The invention also relates to compounds of the abovementioned general formula R<1>aRebOc, excepting the compounds methylrhenium trioxide CH3ReO3, (CH3)6Re2O3, (CH3)4Re2O4 and pentamethylcyclopentadienly-rhenium trioxide ( eta <5>-C5(CH3)5)ReO3. The invention furthermore relates to a process for preparing organometallic catalysts as defined above. The invention finally relates to a process for the metathesis of olefins on catalysts which consist of oxide support materials to which compounds of the type defined above are applied. |
