Preparation of preparing substituted indanones

A metallocene compound of the formula VI

• where
• R1 is a linear, branched or cyclic C1-C8-alkyl group which may bear one or more identical or different fluorine or chlorine substituents, a phenyl group which may bear one or more identical or different fluorine or chlorine substituents, a C1-C12-alkylaryl or arylalkyl group, where the alkyl part may bear one or more identical or different fluorine or chlorine subsituents and the aryl part may bear one or more identical or different fluorine or chlorine subsituents, a C2-C8-alkenyl group or a C2-C8-alkynyl group, a C8-C12-arylalkyl group which may bear one or more identical or different fluorine or chlorine subsituents, or R1 is an OR2, SiR23 or —OSiR23 group, where R2 are identical or different and are each a C1-C4-alkyl group or phenyl group or R1 is a C, —C1-6-heterocyclic group, where the heteroatoms are oxygen, nitrogen, sulfur or silicon and the group may in turn bear C1-C10-radicals or heteroatoms as substituents.
• M is titanium, zirconium or hafnium,
• R9 and R10 are identical or different and are hydrogen, hydroxy, C1-C10-alkyl, C1-C10-alkoxy, C1-C10-alkyl, C1-C10-aryloxy, C2-C10-alkenyl, C7-C40-arylalkyl, C7-C40-alkyaryl or C8-C40-arylalkenyl,
• x is zero or 1,
• R3 is 4-(C4-C8-alkyl) phenyl, where the (C4-C8-alkyl) group is a branched C4-C8-alkyl group,
• Y4 and Y6 are hydrogen Y5 is hydrogen or R3,
• R11 is a bridging group of the formula
• where M2 is carbon, silicon, germanium or tin,
• p is 1, 2 or 3,
• R12 and R13 are identical or different and are hydrogen, halogen C1-C20-alkyl, C6-C14— aryl, C1-C10— alkoxy, C2-C10— alkenyl, C7-C20-arylalky, C7-C20-alkyaryl, C6-C10— aryloxy, C1-C10-fluoralkyl, C6-C10-haloaryl or C2-C10-alkynyl or R12 and R13 together with the atom connecting them from a ring, wherein the radicals having the same designation on the two indenyl ligands can be identical or different from one another.