The ring-opening metathesis polymerization of cyclooctadiene (COD) in the presence of a chain transfer agent (CTA) was investigated. The effect of the CTA structure and choice of catalyst on the overall efficiency of the polymerization reaction is discussed. A separation of oxygen functionality from the olefin in the CTA by two methylene units significantly enhances the of the discrete, tungsten-based metathesis catalyst used for these polymerizations. Furthermore, more robust well-defined metathesis catalyst based on molybdenum was more effective than the -based catalyst. The preparation oflow-molecular-weight hydroxytelechelic polybutadienes with type of regiochemistry, number-average functionalities that approach 2.0, and in high yield was .
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Hillmyer et al. (1995) studied this question.