| abstract |
The invention relates to metallocene compounds having the formula (I): (CpYq)mMRnBo, wherein: Cp is a non-substituted or substituted, fused or non-fused, homo(iso)cyclic or heterocyclic cyclopentadienyl ligand, Y is a substituent at the cyclopentadienyl ring having structure (II), wherein: D is an element of Group 14 of the Periodic Table (IUPAC), R?1, R2 and R3¿ are the same or different and are each one of a hydrogen, a halogen, a C¿1?-C10 hydrocarbyl group, a C1-C10 hydrocarbyloxy group, a C1-C12 organosilicon group, or at least two of R?1, R2 and R3¿ form together with D a C¿4?-C20 ring structure; M is a transition metal of Group 4 of the Periodic Table (IUPAC) and is bound to the ligand Cp or ligands Cp in an θ?5¿ bonding mode; R is bound to M and is one of a hydrogen, a halogen, a C¿1?-C10 hydrocarbyl group, a C1-C10 hydrocarbyloxy group, a C1-C12 organosilicon group, or two R form together with M a C4-C20 metallocyclic ring structure; B is a bridge atom or group between two Cp ligands or between one Cp ligand and M; q is 0-5, m is 1 or 2; m.q≥ 1; o is 0 or 1; and n is 4-m-o, except when there is one bridge B between two Cp ligands, in which case n is 4-m, their intermediates, preparation and use. |