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Highly selective ring opening metathesis polymerization (ROMP) of norbornene can be achieved using a new Ru(II)-vinylidene complex as catalyst precursor. The polymerization reaction proceeds in 1,2-dichloroethane at 80 °C in absence of co-catalysts with high turnover frequencies. The molecular weight and molecular weight distribution of the polymers obtained indicate that different species are active...
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