PROCESS FOR THE PREPARATION OF SUBSTITUTED INDENES AND THEIR USE AS LIGAND SYSTEMS FOR METALLOCENE CATALYSTS

摘要

HOE 91/F 375 Process for the preparation of substituted indenes and their use as ligand systems for metallocene catalysts The invention relates to a process for the preparation of a compound of the formula IV or IVa (IV) (IVa) in which R1-R5 are preferably hydrogen or alkyl, which comprises reacting a compound I (I) with a compound II (II) in which X1 and X2 are preferably halogen, to give the corresponding indanones, which are converted into the compounds IV and IVa by reduction and dehydration. The compounds IV and IVa are important intermediate products for the preparation of chiral metallocene complexes which are suitable catalyst components for olefin polymerization.