ansa-Metallocenes Bearing 4-(N-Azolyl)-2-methylindenyl and Related Ligands: Development of Highly Isoselective Catalysts for Propene Polymerization at Higher Temperatures

Авторы: Izmer Vyatcheslav V., Lebedev Artem Y., Kononovich Dmitry S., Borisov Ilya S., Kulyabin Pavel S., Goryunov Georgy P., Uborsky Dmitry V., Canich Jo Ann M., Voskoboynikov Alexander Z.
Журнал: Organometallics
Год издания: 2019
Издательство: American Chemical Society
Местоположение издательства: United States
DOI: 10.1021/acs.organomet.9b00648
Аннотация: A series of Me2Si-bridged bis(2-Me-indenyl) ansa-zirconocenes contg. N-pyrrolyl, N-indolyl, N-carbazolyl and P-dibenzophospholyl substituents in position 4 of the indenyl moieties has been synthesized. Pd-catalyzed arylation of the azoles with 4-halogen-substituted indenes was used to synthesize the resp. 4-(N-azolyl)indenes. 4-(P-Dibenzophospholyl)indene was obtained in high yield by reaction of 5-Cl-dibenzophosphole with (2-Me-inden-4-yl)MgBr. Some of the synthesized zirconocenes were characterized with X-ray crystallog. The rac-zirconocenes were tested in propylene polymn. in the presence of MAO or perfluoroarylborate activators. At 100°, zirconocene rac-Me2Si[2-Me-4-(N-carbazolyl)indenyl]2ZrCl2/MAO afforded highly cryst. isotactic polypropylene with reasonable mol. wt. (318 kDa) and Tm of 157° detd. by a remarkably low total no. of stereo- and regioerrors, which makes it one of the most isoselective catalysts for high-temp. propylene polymn.
Добавил в систему: Уборский Дмитрий Вадимович

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