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Ad Cohen, Geoffrey W. Coates and Moshe Kol Propylene polymerization by C1-symmetric {ONNO′}-type salan zirconium complexes Journal of Polymer Science Part A: Polymer Chemistry 51

Article first published online: 29 OCT 2012 | DOI: 10.1002/pola.26408

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The polymerization of propylene by C1-symmetric dibenzyl zirconium complexes of nonsymmetric Salan ligands that feature a halo-substituted phenolate ring and a bulky alkyl-substituted phenolate ring is described for the first time. Polypropylene of average isotacticity and enantiomorphic site control signature typical of C2-symmetric catalysts imply a facile polymeryl site epimerization and propylene insertion from both directions. The Mw of the polymers was low and depended on the size of the halo groups.

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