Process for recycling cyclopentadienyl derivatives and preparation of metallocenes from cyclopentadienyl or substituted derivatives recycled.

摘要

Process for recycling substituted cyclopentadienyl derivatives of the formulas (I) and (I '') ** (See formula) ** or biscyclopentadienyl derivatives forming bridge of the formula (II) ** (See formula) where R1 ** , R10 are identical or different and are each an organic radical having 1 to 40 carbon atoms, R2, R20 are identical or different and are each hydrogen or an organic radical having 1 to 40 carbon atoms, or R1 with R2 and / or R10 with R20 together with the atoms connecting them in each case form a monocyclic or polycyclic, saturated or unsaturated, substituted or unsubstituted having from 3-40 carbon atoms ring and has a size ring of 5 to 12 carbon atoms and can also include heteroatoms selected from the group consisting of the elements Si, Ge, N, P, As, Sb, O, S, Se or Te, T, T 'are identical or different and are each a divalent organic group having 1 to 40 carbon atoms and together with the ring cycle pentadienyl in each case form at least one saturated ring system or unsaturated, substituted or unsubstituted alkyl having a ring size of 5 to 12 atoms, where T and T 'within the system ring fused to the cyclopentadienyl ring may include heteroatoms Si, Ge, N, P, As, Sb, O, S, Se or Te, Z is a bridge between the two substituted ligands cyclopentadienyl consisting of a divalent atom or a divalent group, including the steps of (1 ) recovering the cyclopentadienyl derivatives of the formulas (I) and (I '') or derivatives biscyclopentadienyl forming bridge of the formula (II) from filtrates, mother liquors, reaction residues and / or residues processing obtained in the preparation of metallocenes and / or in preparing biscyclopentadienyl ligands bridge forming and (2) subsequently subjecting the products obtained in step (1) to liquid-solid chromatography.