✦ LIBER ✦

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

✍ Scribed by Shigeki Habaue; Hiroshi Sakamoto; Hideo Baraki; Yoshio Okamoto

Publisher: John Wiley and Sons
Year: 1997
Tongue: English
Weight: 291 KB
Volume: 18
Category: Article
ISSN: 1022-1336
DOI: 10.1002/marc.1997.030180812

No coin nor oath required. For personal study only.

✦ Synopsis

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 completely resolved with the highest separation factor. The isolated enantiomerically pure hafnocenes were applied for the asymmetric cyclopolymerization of 1,5‐hexadiene.

📜 SIMILAR VOLUMES

Polymerization and asymmetric oligomeriz

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

✍ Shigeki Habaue; Hideo Baraki; Yoshio Okamoto 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 373 KB

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 diphenylmethyl