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. 2020 Jun 26;11:3250. doi: 10.1038/s41467-020-16945-8

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — a Step-growth polyaddition reaction between C₃A and C₆T to furnish unsaturated polyamides (C₃A-C₆T). b Representative ¹H NMR spectrum (DMSO–d₆, 25 °C, 400 MHz) of C₃A-C₆T (73% cis content) from using DMSO and DBU. Cis and trans proton resonances were assigned by coupling constants. c SEC (DMF, 0.5 % w/w NH₄BF₄) chromatograms determined against poly(methyl methacrylate) (PMMA) standards for polyamides with various stereochemistry.