Preparation of propene oligomers

摘要

A process for propene oligomerization catalyzed by transition metal complexes in liquid phase to give propene oligomers with a high content of terminal double bonds, comprises oligomerizing propene in the presence of a catalyst of the formula I Cp2MX2 I where Cp is an unsubstituted cyclopentadienyl unit and/or a mono-C1-C4-alkylcyclopentadienyl unit, M is zirconium or hafnium and the ligands X are each hydride and/or halide and/or methyl, and in the presence of an aluminoxane cocatalyst, and where the ratio of the amounts of the catalyst I and the aluminoxane cocatalyst is such that the M/Al atomic ratio is from 1:250 to 1:1000, employing a temperature of from 50 DEG to 110 DEG C. and a pressure of from 30 to 100 bar.