✦ LIBER ✦

Reactions of Group IV Metallocene Dichlorides with Modified Silica Gel Surfaces

✍ Scribed by Niles G. Dufrenne; Jonathan P. Blitz; Craig C. Meverden

Publisher: Elsevier Science
Year: 1997
Tongue: English
Weight: 94 KB
Volume: 55
Category: Article
ISSN: 0026-265X
DOI: 10.1006/mchj.1996.1412

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✦ Synopsis

Reactions of bis(cyclopentadienyl)titanium dichloride, bis(cyclopentadienyl)zirconium dichloride, and bis(cyclopentadienyl)hafnium dichloride with premodified silica gel surfaces were studied. The silica gel surface was pretreated to selectively eliminate nonhydrogen bonded silanols, hydrogen bonded silanols, or both before reaction. By study of the metallocene reactions with these silicas and unmodified silica gel, it was found that the metallocenes react predominantly with nonhydrogen bonded silanols. Although none of the metallocenes are very reactive with silica as compared to titanium tetrachloride, reactivity increases in the order Cp 2 TiCl 2 õ Cp 2 ZrCl 2 õ Cp 2 HfCl 2 .

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