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Kati Vehlow, Dongren Wang, Michael R. Buchmeiser and Siegfried Blechert Alternating Copolymerizations Using a Grubbs-Type Initiator with an Unsymmetrical, Chiral N-Heterocyclic Carbene Ligand Angewandte Chemie International Edition 47

Article first published online: 15 FEB 2008 | DOI: 10.1002/anie.200704822

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Good for a ROMP: Initiators 1 and 2, which both contain an unsymmetric, chiral N-heterocyclic carbene (NHC) ligand, mediate the alternating copolymerization of norborn-2-ene with other cyclic olefins including cyclopentene and cyclooctene. The selectivity of the copolymerization is explained by the steric interaction of the growing polymer chain with the 1-phenylethyl substituent and the nitrogen atom of the NHC ligand.

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