Reivindicaciones
1. Single-carbon bridged bis cyclopentadienyl compounds characterized by the following general formula I <img class="EMIRef" id="585187876-ib0011" /> wherein each L, equal to or different from each other, is selected from the group consisting of: <img class="EMIRef" id="585187876-ib0012" /> wherein each R1 equal to or different from each other is selected from the group consisting of: hydrogen, a monovalent aliphatic or aromatic hydrocarbon group, optionally containing heteroatoms of group 14 to 16 of the periodic table of the elements and boron; optionally two R<1> form an aromatic or aliphatic ring; each R2 , equal to or different from each other, is selected from the group consisting of: C<1>-C<20> alkylidene, C<3>-C<20> cycloalkylidene, C<2>-C<20> alkenylidene, C<6>-C<20> arylidene, C<7>-C<20> alkylarylidene, C<7>-C<20> arylalkylidene, C<8>-C<20> arylalkenylidene, C<8>-C<20> alkenylarylidene, linear or branched, optionally containing heteroatoms of group 14 to 16 of the periodic table of the elements or boron; one R<2> is optionally absent; in this case A is directly bonded to C and is preferably hydrogen; each A, equal to or different from each other, is selected from the group consisting of: hydrogen, OR<3>, NRR<4>, or SR<5> wherein each R3 is independently selected from the group consisting of: R, SiR<3>, SO<2>R, CR<2>OR; CR<2>SR, or any other group used as protective group of alcohols in organic synthesis; each R4 is independently selected from the group consisting of: R, SiR<3>, SO<2>R, or any other group used as protective group of amines in organic synthesis; each R5 is independently selected from the group consisting of: R, SiR<3>, CR<2>OR; CR<2>SR, or any other group used as protective group of thiols in organic synthesis; each R is independently selected from the group consisting of: C<1>-C<20> alkyl, C<3>-C<20> cycloalkyl, C<6>-C<20> aryl, C<2>-C<20> alkenyl, C<7>-C<20> arylalkyl, C<7>-C<20> alkylaryl, C<8>-C<20> arylalkenyl, C<8>-C<20> alkenylaryl linear or branched; optionally two R form a aliphatic or aromatic ring; with the proviso that at least one A is not hydrogen. 2. Bis cyclopentadienyl compounds according to claim 1 wherein each R1 is independently selected from the group consisting of: hydrogen; C<1>-C<20> alkyl; C<3>-C<20> cycloalkyl; C<6>-C<20> aryl; C<2>-C<20> alkenyl; C<7>-C<20> arylalkyl; C<7>-C<20> alkylaryl; C<8>-C<20> arylalkenyl; C<8>-C<20> alkenylaryl; linear or branched, optionally substituted by BR<2>, OR, SiR<3>, NR<2>. 3. Bis cyclopentadienyl compound, according to claims 1-2 wherein each R is independently selected from the group consisting of: butyl, propyl, ethyl, methyl. 4. Bis cyclopentadienyl compound, according to claims 1-3 wherein each R2 is independently selected from the group consisting of: butylidene, propylidene, ethylidene, methylene. 5. Bis cyclopentadienyl compound, according to claims 1-4 wherein at least one A is OSiR<3>. 6. Process for obtaining a bis cyclopentadienyl compound, according to claims 1-5 comprising the step of contacting a metallating compound selected from the group consisting of: organolithium compounds, organosodium compounds, organopotassium compounds, organomagnesium, sodium hydride, potassium hydride, lithium, sodium, or potassium with a compound (LH) selected from the group consisting of <img class="EMIRef" id="585187876-ib0013" /> and with a compound of general formula II <img class="EMIRef" id="585187876-ib0014" /> increasing the temperature and recovering the product. 7. Process for the preparation of a bis cyclopentadienyl compound according to claims 1-5 wherein the two L groups are different, comprising contacting a metallating compound selected from the group consisting of: organolithium compounds, organosodium compounds, organopotassium compounds, organomagnesium, sodium hydride, potassium hydride, lithium, sodium, or potassium with a compound (LH) selected from the group consisting of: <img class="EMIRef" id="585187876-ib0015" /> with a compound of general formula II <img class="EMIRef" id="585187876-ib0016" /> adding a second compound LH different from the first one; adding a second amount of metallating compound increasing the temperature and recovering the product. 8. Process according to claim 7 wherein the second compound LH is premixed with the second amount of metallating compound before addition to the reaction mixture. 9. Metallocene complex characterized by the following formula <img class="EMIRef" id="585187876-ib0017" /> wherein : each L' is independently a cyclopentadienyl compound which forms with the metal an η<5> complex, and is selected from the group consisting of: <img class="EMIRef" id="585187876-ib0018" /> M is a transition metal of groups 3-6 of the periodic table; m is a number coinciding with the oxidation state of the transition metal; each X, equal to or different from each other, is selected from the group comprising: halogen, hydrogen, OR, N(R)<2>, C<1>-C<20> alkyl or C<6>-C<20> aryl. 10. Metallocene complex according to claim 9 wherein M is selected from the group consisting of: zirconium, titanium or hafnium; X is halogen. 11. Process for obtaining a metallocene complex according to claims 9 and 10 comprising the following steps: a) Reacting a compound of general formula I with a metallating compound selected from the group consisting of: organolithium compounds, organosodium compounds, organopotassium compounds, organomagnesium, sodium hydride, potassium hydride, lithium, sodium, or potassium; b) Reacting the obtained product with a compound of general formula MX<m>E<q>, wherein E is an ether or an amine forming an adduct with M and q is 0, 1, 2, 3 or 4. 12. Metallocene complex characterized by the following general formula <img class="EMIRef" id="585187876-ib0019" /> wherein each B is selected from the group consisting of: OH, NRH or SH. 13. Catalysts for the polymerization of olefins comprising at least a metallocene complex according to claims 9, 10 or 12 and a cocatalyst. 14. Polymerization catalyst according to claim 13 further comprising an inorganic support. 15. Supported polymerization catalyst according to claim 14 wherein the inorganic support is selected from the group consisting of: silica, MAO modified silica, alumina, silica alumina, aluminum phosphates and mixtures thereof. 16. Supported polymerization catalyst according to claims 14-15, wherein at least one group A of the metallocene is OSiR<3> and the inorganic support is MAO modified silica. 17. Process for obtaining supported catalyst component according to claims 14-16 comprising the following steps: a) reacting, under anhydrous conditions and inert atmosphere, a solution of at least one metallocene complex of formula III or IV, with a suspension of the supporting material in an aliphatic or aromatic hydrocarbon at a temperature between -20° C and 90 °C; b) filtration and washing with an aliphatic or aromatic hydrocarbon. 18. Process for the polymerization of olefins characterized by the use of the catalyst according to claims 13-16.
