Resumen
[0001] Procedure for the preparation of aromatic derivatives of titanocene, useful as catalysts for the polymerisation and hydrogenation of polymers, characterised by the use of a Grignard reagent. This procedure allows to easily prepare compounds with the general formula : <img class="EMIRef" id="584493293-ia01" /> where: L, which can be equal to or different one from the other, are cyclopentadiene, or pentamethylcyclopentadiene; preferably at least one L is cyclopentadiene; R<1>, R<2>, R<3>, equal or different from one another, are selected from the group consisting of: hydrogen, alkyl group from 1 to 4 carbon atoms, OR<4> where R<4> is an alkyl group of 1 to 4 carbon atoms; at least one of the R<1>, R<2> or R<3> is hydrogen. The preparation is carried out by the reaction of the titanocene dichloride with the corresponding Grignard reagent. This method substantially enhances safety, reproducibility, yield and cost of that carried out via lithium compounds.