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C1-Symmetric Heterocyclic Zirconocenes as Catalysts for Propylene Polymerization, 2

✍ Scribed by Luigi Resconi; Simona Guidotti; Isabella Camurati; Riccardo Frabetti; Francesca Focante; Ilya E. Nifant'ev; Ilya P. Laishevtsev

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
466 KB
Volume
206
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

Summary: Sixteen C~1~‐symmetric zirconocene and one hafnocene complexes bearing the 2,5‐R~2~‐7H‐cyclopenta[1,2‐b:4,3‐b′]dithiophene ligand (R = H, Me, Et, Ph) linked to a substituted indenyl ligand have been synthesized and tested in propylene polymerization. Most of the C~1~‐symmetric zirconocenes of this type are highly active in propylene polymerization at low MAO/Zr ratios and produce poly(propylene)s (PP) in a broad range of isotacticity and melting points. The molecular weight and crystallinity of the PPs are strongly dependent upon the type of substituents on the indenyl moiety: PPs with T~m~ between 75 and 156 °C and viscosity average molecular weights between 100 000 and 400 000 have been obtained at 50–70 °C in liquid propylene.

General formula of the indenyl‐based zirconocenes.

magnified imageGeneral formula of the indenyl‐based zirconocenes.

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