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Scandium-catalyzed polymerization of CH3(CH2)nCH=CH2 (n = 0–4): remarkable activity and tacticity control

Ward, Benjamin David, Lukešová, Lenka, Wadepohl, Hubert, Bellemin-Laponnaz, Stéphane and Gade, Lutz H. 2009. Scandium-catalyzed polymerization of CH3(CH2)nCH=CH2 (n = 0–4): remarkable activity and tacticity control. European Journal of Inorganic Chemistry 2009 (7) , pp. 866-871. 10.1002/ejic.200801106

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Abstract

The C3-symmetric trisoxazoline-supported scandium complex [Sc(iPr-trisox)(CH2SiMe3)3] (2) is highly active in the stereospecific polymerization of propene, 1-butene, 1-pentene, 1-hexene and 1-heptene, when activated with two equivalents of [Ph3C][B(C6F5)4]. The polymers thus produced were found to possess narrow molecular weight distributions and high levels of tacticity control (up to 99% mmmm). Some insight into the nature of the active species was obtained by 1H, 13C and 29Si NMR experiments. In particular, the formation of two equivalents of Ph3CCH2SiMe3 at ambient temperature was observed alongside a C3-symmetric scandium complex tentatively assigned as the dication [Sc(iPr-trisox)- (CH2SiMe3)]2+.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Subjects: Q Science > QD Chemistry
Uncontrolled Keywords: Scandium / Olefins / Polymerization / X-ray diffraction
Publisher: Wiley-Blackwell
ISSN: 1434-1948
Last Modified: 04 Jun 2017 02:08
URI: http://orca.cf.ac.uk/id/eprint/9729

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