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13C NMR characterization of unsaturated terminal structures in oligoisobutylenes

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Summary

13C NMR analysis revealed the existence of additional unsaturated terminal structures in oligoisobutylene samples, in addition to the well-known-CH2C(CH3)=CH2 and-CH=C(CH3)2. Structure with a double bond between two quaternary carbons was detected both in commercial Oppanol B3 and in a oligoisobutylene (PIB) sample prepared by polymerization in CH2Cl2 with a high concentration of monomer in the presence of BCl3 at-20°C. In the latter sample, another type of the structure with a double bond between quaternary carbon and methine carbon (-CH=C(CH3)-CH2CH3) was found in a large amount.

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Authors and Affiliations

  1. Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, CZ-162 06, Prague 6, Czech Republic

    Jiří Spěváček, Luděk Toman & Petr Vlěk

Authors
  1. Jiří Spěváček
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  2. Luděk Toman
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  3. Petr Vlěk
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Spěváček, J., Toman, L. & Vlěk, P. 13C NMR characterization of unsaturated terminal structures in oligoisobutylenes. Polymer Bulletin 34, 461–467 (1995). https://doi.org/10.1007/BF00306241

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  • DOI: https://doi.org/10.1007/BF00306241

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