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Controlled Living Ring-Opening-Metathesis Polymerization by a Fast-Initiating Ruthenium Catalyst

Authors

  • Tae-Lim Choi,

    1. Arnold and Mabel Laboratories of Chemical Synthesis, California Institute of Technology, Division of Chemistry and Chemical Engineering, MC 164-30 Pasadena, CA 91125, USA, Fax: (+1) 626-564-9297
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  • Robert H. Grubbs Prof.

    1. Arnold and Mabel Laboratories of Chemical Synthesis, California Institute of Technology, Division of Chemistry and Chemical Engineering, MC 164-30 Pasadena, CA 91125, USA, Fax: (+1) 626-564-9297
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  • The authors would like to thank the National Science Foundation for generous support of this research, and D. Benitez, D. P. Sanders, J. P. Morgan, and O. A. Scherman for helpful discussions, and A. Hejl for the generous supply of catalyst 4.

Abstract

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Highly active with ultrafast initiation, the catalyst 1 promotes the controlled, living, ring-opening polymerization of various norbornene and 7-oxonorbornene derivatives (see scheme). The high ki/kp ratio associated with the polymerization reactions results in better molecular-weight control and narrower polydispersity indexes (PDIs, ki=rate constant for initiation, kp=rate constant for polymerization).

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