NDLI: Isospecific propylene polymerization with in situ generated bis(phenoxy-amine)zirconium and hafnium single site catalysts

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Saito, Junji Makio, Haruyuki Fujita, Terunori Prasad, Aitha Vishwa Terao, Hiroshi
Description	Author Affiliation: Makio H ( Mitsui Chemicals Singapore R&D Centre, Pte. Ltd. 50 Science Park Road, #06-08 The Kendall, Singapore Science Park II, Singapore 117406. haruyuki.makio@mitsui-chem.co.jp)
Abstract	Bis(phenoxy-imine) Zr and Hf complexes were activated with $^{i}Bu_{3}Al$ or $^{i}Bu_{2}AlH$ in conjunction with $Ph_{3}CB(C_{6}F_{5})_{4}$ and tested as catalysts for propylene polymerization with emphasis on the enantioselectivity of the isospecific species and the single site polymerization characteristics. The isoselective species was identified as the in situ generated bis(phenoxy-amine) complex whose isoselectivity was sensitive to subtle changes in ligand structure. By employing specific substituents at certain key positions the isotacticity reached an extremely high level comparable to high-end commercial isotactic polypropylenes $(T_{m}$ > 160 °C). Single site polymerization characteristics depended upon the efficiency and selectivity of the in situ imine reduction which is sensitive to the substituent on the imine nitrogen and the reaction conditions. By using $^{i}Bu_{2}AlH$ as a reducing agent , quantitative imine reduction can be achieved with a stoichiometric amount of the reducing agent . This lower alkylaluminum loading is beneficial for the catalyst and significantly enhances the polymerization activity and the molecular weight of the resultant polymer .
ISSN	14779226
Issue Number	25
Volume Number	42
e-ISSN	13645447
Journal	Dalton Trans.
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2013-07-07
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Alkenes Chemistry Amines Hafnium Organometallic Compounds Phenols Zirconium Catalysis Molecular Structure Chemical Synthesis Polymerization Journal Article Research Support, Non-U.S. Gov't
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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