Inversion of stereoselectivity in a metallocene catalyst
作者:
Tetsunosuke Shiomura,
Tadashi Asanuma,
Norihide Inoue,
期刊:
Macromolecular Rapid Communications
(WILEY Available online 1996)
卷期:
Volume 17,
issue 1
页码: 9-14
ISSN:1022-1336
年代: 1996
DOI:10.1002/marc.1996.030170102
出版商: Hüthig&Wepf Verlag
数据来源: WILEY
摘要:
AbstractInversion of stereoselectivity of a particular metallocene (Me2Si(Flu) (N‐t‐Bu)ZrCl2) (Me: methyl, Flu: fluorenyl,t‐Bu:tert‐butyl) from syndiospecific into isospecific was observed by changing the cocatalyst from methylaluminoxane (MAO) to [Ph3C]+[B(C6F5)4]−/AliBu3(iBu:isobutyl). The change of the solvent‐separated ion pair (in case of MAO as cocatalyst) into the contact ion pair (in case of the more polar and less bulky borate anion) was proposed as the plausible explanation of this
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