Ansa-zirconocenes bearing 5-NR2-6-alkyl-4-hydrocarbyl-2-methylindenyl moieties: Synthesis, structure, stereoselective polymerization of propylene

Publication date: Available online 27 April 2019Source: Journal of Organometallic ChemistryAuthor(s): Pavel S. Kulyabin, Ivan A. Portnyagin, Alexey N. Tsarev, Andrey F. Asachenko, Georgy P. Goryunov, Vyatcheslav V. Izmer, Dmitry V. Uborsky, Alexander Z. Voskoboynikov, Noureddine Ajellal, Tiina Vanne, Riitta Varzeshkhah, Luigi Resconi, Pascal CastroAbstractA series of C2–symmetric SiMe2-bridged bis-indenyl zirconium complexes containing 2-methyl-4-aryl/isopropyl-5-amino/pyrrolyl-6-alkylindenyl fragments have been synthesized and unambiguously characterized. These complexes activated by MAO demonstrated high catalytic activity in homo- and heterogeneous polymerization of propylene outperforming the traditional Spaleck system. The degree of electronic interaction of aminogroup in pos. 5 with indenyl ring system was tested via computational investigations, and notable influence of aminogroup on electronic structure of the complexes is witnessed by C (indenyl)N bond order and a sum of NAC of the ZrCl2 fragment.Graphical abstract

Source: Journal of Organometallic Chemistry - April 28, 2019 Category: Chemistry Source Type: research