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Alternating Copolymerizations Using a Grubbs-Type Initiator Based on an Unsymmetrical, Chiral N-Heterocyclic Carbene

Alternating copolymerization
Lupe

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.

Siegfried Blechert; Kati Vehlow; Dongren Wang; Michael R. Buchmeiser; Alternierende Copolymerisation durch einen Grubbs-Initiator mit einem unsymmetrischen chiralen N-heterocyclischen Carben-liganden, Angew. Chem., 2008, 120 (14), 2655 - 2658 [DOI].
Alternating Copolymerizations Using a Grubbs-Type Initiator Based on an Unsymmetrical, Chiral N-Heterocyclic Carbene, Angew. Chem. Intern. Ed., 2008, 47 (14), 2615 - 2618 [DOI].

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