Metallocene compounds, process for their preparation and their use in catalytic systems for the polymerization of olefins

A metallocene compound of the general formula (I):

• wherein
• Y is a moiety of formula (II)
• wherein
• A, B and D, same or different from each other, are selected from an element of the groups 14 to 16 of the Periodic Table of the Elements (new IUPAC version), with the exclusion of nitrogen and oxygen;
• R1, R2, R3, R4 and R5, same or different from each other, are selected from hydrogen, a C1-C20-alkyl, C3-C20-cycloalkyl, C2-C20-alkenyl, C6-C20-aryl, C7-C20-alkylaryl, C7-C20-arylalkyl radical optionally containing heteroatoms belonging to groups 13-17 of the Periodic Table of the Elements;
• wherein two R3 can form a ring comprising 4 to 8 atoms, or R3 and R4 can form a ring comprising 4 to 8 atoms, which can bear substituents;
• with the proviso that when s is 0 or when R3 is hydrogen, R2 is not hydrogen;
• n, m and s, equal to or different from each other, are selected from 0, 1 and 2;
• m, n and s being 0 when respectively A, B and D are selected from an element of the group 16 of the Periodic Table of the Elements (new IUPAC version);
• m, n and s being 1 when respectively A, B and D are selected from an element of the group 15 of the Periodic Table of the Elements (new IUPAC version);
• m, n and s being 1 or 2 when respectively A, B and D are selected from an element of the group 14 of the Periodic Table of the Elements (new IUPAC version);
• and wherein the ring containing A, B and D can have double bonds in any of the allowed positions;
• Z is selected from a moiety of formula (II) as described above and from a moiety of formula (III):
• wherein R6, R7, R8 and R9, same or different from each other, are selected from hydrogen, a C1-C20-alkyl, C3-C20-cycloalkyl, C2-C20-alkenyl, C6-C20-aryl, C7-C20-alkylaryl, C7-C20-arylalkyl radical, optionally containing heteroatoms belonging to groups 13-17 of the Periodic Table of the Elements, R7 being different from hydrogen;
• optionally R6 and R7 or R7 and R8 can form a ring comprising 4 to 8 carbon atoms, which can bear substituents;
• and when Z is a moiety of formula (II), Y and Z can be the same or different from each other;
• L is a divalent bridging group;
• M is an atom of a transition metal selected from those belonging to group 3, 4, 5, 6 or to the lanthanide or actinide groups in the Periodic Table of the Elements (new IUPAC version), X, same or different, is a hydrogen atom, a halogen atom, a R10, OR10, OSO2CF3, OCOR10, SR10, NR102 or PR102 group, wherein the substituents R10 are selected from the group consisting of C1-C20 alkyl, C3-C20 cycloalkl, C6-C20 aryl, C7-C20 alkylaryl and C7-C20 arylalkyl radical, optionally containing heteroatoms belonging to groups 13-17 of the Periodic Table of the Elements;
• p is an integer of from 1 to 3, being equal to the oxidation state of the metal M minus 2.