Abstract
Perdeuterated ethyl methacrylate was polymerized with BuLi in toluene at −78°C. The resulting product consisted of syndiotactic and isotactic polymers and oligomers, indicating the existence of multiple active species. The structure of each component was confirmed by 1H NMR spectroscopy. Most of the oligomers had butyl isopropenyl ketone units at the chain ends. The isotactic polymer contained one ketone unit near the beginning of the chain, while the syndiotactic polymer had about two ketone units located near the beginning and interior sequence of the chain. The mechanism of polymerization is discussed in detail, and also the structures of active species are proposed from the standpoint of the association of lithium alkoxide formed in the system, that is, the syndiotactic active species are associated with the alkoxide while the isotactic species are not.
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Hatada, K., Kitayama, T., Okahata, S. et al. Studies on the Mechanism of Polymerization of Ethyl Methacrylate with BuLi in Toluene Using Perdeuterated Monomer and Multiplicity of Active Species. Polym J 14, 971–983 (1982). https://doi.org/10.1295/polymj.14.971
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DOI: https://doi.org/10.1295/polymj.14.971
