A latent s-chelated ruthenium benzylidene initiator for ring-opening metathesis polymerization



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Herein, we present the first results on the use of sulfur chelated ruthenium olefin metathesis catalysts in ring-opening metathesis polymerization (ROMP). By the use of these slow initiators, monomer consumption, undetectable at room temperature, could be reversibly turned on and off as desired by heating and cooling cycles, respectively. Significantly, polymer size essentially remained constant throughout reaction progress, irrespective of catalyst loading. The polymers produced presented monomodal high molecular weights (>105 g/mol) with relatively low polydispersities (<1.4). [Color figure can be viewed in the online issue, which is available at www.interscience.wiley.com.]