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Polymerization and asymmetric oligomerization of allylsilanes using chiral ethylenebis(4,5,6,7-tetrahydro-1-indenyl)zirconium and -hafnium complexes

✍ Scribed by Shigeki Habaue; Hideo Baraki; Yoshio Okamoto

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 373 KB
Volume: 199
Category: Article
ISSN: 1022-1352
DOI: 10.1002/(sici)1521-3935(19981001)199:10<2211::aid-macp2211>3.0.co;2-z

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✦ Synopsis

Stereospecific polymerization andasymmetric oligomerization of allylsilanes were investigated by using C2-and C,-symmetric zirconocene catalysts. Isotactic and syndiotactic poly(allylsi1ane)s were produced with rac-ethylenebis(4,5,6,7-tetrahydro-1 -indenyl)zirconium dichloride (1) and diphenylmethylene($cyclopentadienyl)(~5-fluorenyl)zirconium dichloride (6), respectively. Bulky allylsilanes afforded optically active oligomers in the reactions using optically active ethylenebis(4,5,6,7-tetrahydro-1-indeny1)zirconium and -hafnium complexes.

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Chiral ethylenebis(4,5,6,7-tetrahydro-1-indenyl) complexes of zirconium and hafnium: separation and application to asymmetric polymerization

✍ Shigeki Habaue; Hiroshi Sakamoto; Hideo Baraki; Yoshio Okamoto 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 291 KB

## Abstract Optical resolution of ethylenebis(4,5,6,7‐tetrahydro‐1‐indenyl) complexes of zirconium and hafnium was performed by using cellulose tris(3,5‐dimethylphenylcarbamate) coated on silica‐gel (Chiralcel OD) as a chiral stationary phase for HPLC. The biphenyl‐2,2′‐diolate complexes were compl