Resumen

The present invention relates to nietallocene compounds characterized by the following formulas:(LRk)z[LRk-f(RIOH)f]xMXyIwherein: L, equal to or different from each other, is selected from the group comprising: cyclopentadienyl, indenyl, tetrahydroindenyl, fluorenyl, octahydrofluorenyl or benzoindenyl; each R is independently selected from hydrogen, C1-C20 alkyl, C3-C20 cycloalkyl, C6-C20 aryl, C3-C20 alkenyl C7-C20 arylalkyl, C7-C20 alkylaryl, C8-C20 arylalkenyl, linear or branched, optionally substituted by 1 to 10 halogen atoms, or a group SiRII3; each RI equal to or different from each other, is a group SiRII2, or a divalent aliphatic or aromatic hydrocarbon group containing from 1 to 20 carbon atoms, optionally containing from 1 to 5 heteroatoms of groups 14 to 16 of the periodic table of the elements and boron; each Q is independently selected from B, C, Si, Ge, Sn; M is a metal of group 3, 4 or 10 of the Periodic Table, Laitlanide or Actinide; each X is independently selected from: hydrogen, chlorine, bromine, ORII, NRII2, C1-C20 alkyl or C6-C20 aryl; each RII is independently selected from C1-C20 alkyl, C3-C20 cycloalkyl, C6-C20 aryl, C3-C20 alkenyl, C7-C20 arylalkyl, C7-C20 arylalkenyl or alkylaryl, linear or branched; RII is methyl, ethyl, isopropyl; L' is N or O.