Benchmarking of ruthenium initiators for the ROMP of a norbornenedicarboxylic acid ester |
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Authors: | Sandra Demel Wolfgang Schoefberger Christian Slugovc Franz Stelzer |
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Institution: | Institute for Chemistry and Technology of Organic Materials (ICTOS), Graz University of Technology, Stremayrgasse 16, A-8010, Graz, Austria |
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Abstract: | The kinetic study of ring-opening metathesis polymerization (ROMP) of a diester functionalised norbornene derivative, (±)-exo,endo-bicyclo2.2.1]hept-5-ene-2,3-dicarboxylic acid diethyl ester, with a series of ruthenium benzylidene complexes revealed the applicability of these initiators for well defined polymerization reactions. Values for the rate of initiation as well as the rate of propagation of the initiators were determined and correlated to the molecular weight and polydispersity of the isolated polymers. As the only initiator providing an entry to virtually monodisperse polymers the classical “first generation Grubbs-catalyst” was identified, while N-heterocyclic carbene based initiators polymerized with a rate of propagation much higher than the rate of initiation yielding polymers with a broader molecular weight distribution. |
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Keywords: | ROMP Initiators Ruthenium(II) carbene complexes Kinetics Polynorbornenes |
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