Synthesis of indene derivatives ligands for olefin polymerization catalysts

A series of 2-substituted indenyl ligands were prepared and used in the synthesis of [2-R-Ind]2ZrCl2 [R=C6H5 (1a),C12H9 (2a), C10H7 (3a), C15H11 (4a)]. Zirconium Bis -indenyl compounds (Metallocene catalyst) was simplysynthesized indirect via the intermediating Bis(indenyl ligands)ZrMe2 compounds from 2-indenyl derivatives andfour equivalents of MeLi. The final product was achieved by use of halogenating agent (HCl solution in Et2O).Thismethod although requires two equivalents MeLi more but it still has advantages (higher yield compared to theclassic method).These catalysts consist of zirconium dichloride bonded to two unconnected, oscillating indene ligands substituted atthe 2-position. Bulky substituents enable these metallocenes to polymerize sections of atactic and isotacticpolypropylen.

کلیدواژه ها:

Zirconium ، Indenyl ، Metallocene catalyst ، Synthesis ، Grignard