13C NMR chemical shifts of polyisobutylene end groups and related model compounds |
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| Authors: | Sandor Nemes Jiaoshi Si Joseph P Kennedy |
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| Affiliation: | (1) Institute of Polymer Science, The University of Akron, 44325-3909 Akron, OH, USA;(2) Present address: Department of Applied Chemistry, L. Kossuth University, H-4010 Debrecen 10, Hungary;(3) Present address: Xian Modern Chemistry Research Institute, P. O. Box: 18, Xian, People's Republic of China |
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| Abstract: | Summary The detailed end-structures of CH3-,-Cl, exo-olefin, endoolefin, and-OH ended polyisobutylenes (PIB) have been characterized by high resolution13C NMR spectroscopy. Specifically, the13C chemical shifts characteristic of the various carbons in the following structures have been determined:  CH2C(CH3)2-CH2C(CH3)3, CH2C(CH3)2CH2C(CH3)2Cl, CH2C(CH3)2CH2C(CH3)=CH2, CH2C(CH3)2CH=C(CH3)2, and CH2C(CH3)2CH2CH(CH3)CH2OH. The structure analysis of model compounds was of utmost help in these investigations. The above information is of great value for the identification of terminally functional PIBs and analysis of reaction mixtures. |
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