Theaker, Giles W., Morton, Colin and Scott, Peter, 1965 Dec. 10-. (2011) Zirconium-catalyzed polymerization of a styrene : catalyst reactivation mechanisms using alkenes and dihydrogen. Macromolecules, Vol.44 (No.6). pp. 1393-1404. ISSN 0024-9297

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Abstract

Zirconium salicylaldiminates in the presence of AliBu3/[Ph3C][B(C6F5)4] are inactive for the homopolymerization of p-tert-butylstyrene (TBS), but the addition of hexene leads to a highly active system. Analysis of the polymers by NMR and MALDI indicates surprisingly that most of the product chains contain no hexene, while some contain a single hexene unit. Addition of dihydrogen also leads to the production of poly(TBS) without substantial reduction in molecular weight and with main-chain end-group unsaturation. These and other observations lead us to two related mechanisms for the hexene- and dihydrogen-promoted reactions. Synthetic and catalytic studies indicate that the active species is not a typical bis(salicylaldiminato) compound but an amido/alkoxido system. An authentic compound of this class is highly active for the TBS polymerization even in the absence of added aluminum alkyl.

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry T Technology > TP Chemical technology
Divisions:	Faculty of Science > Chemistry
Library of Congress Subject Headings (LCSH):	Polymerization, Zirconium, Catalysis, Styrene, Polystyrene, Alkenes
Journal or Publication Title:	Macromolecules
Publisher:	American Chemical Society
ISSN:	0024-9297
Date:	22 March 2011
Volume:	Vol.44
Number:	No.6
Page Range:	pp. 1393-1404
Identification Number:	10.1021/ma102835p
Status:	Peer Reviewed
Publication Status:	Published
Funder:	European Regional Development Fund (ERDF) , Engineering and Physical Sciences Research Council (EPSRC)
URI:	http://wrap.warwick.ac.uk/id/eprint/40478

Data sourced from Thomson Reuters' Web of Knowledge

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