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. 2019 Mar 11;7:123. doi: 10.3389/fchem.2019.00123

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Copyright © 2019 Reichsöllner, Creamer, Cong, Casey, Eder, Heeney and Glöcklhofer.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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¹H NMR spectra of 1b-S (bottom) and corresponding polymers obtained by modification using increasing amounts of DMDO (bottom to top; 4.5 equiv: 1b-SO₂). Arrows show the shifts of the peak of the aliphatic protons next to the thioalkyl sulfur upon modification: (a) downfield shift and splitting of the peak of the aliphatic protons next to the thioalkyl sulfur upon oxidation to the sulfoxide, (b) upfield shift and reunification by further oxidation to the sulfone, (c) downfield shift upon occurrence of two neighboring sulfones. See Supplementary Material for full spectra.