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. 2019 Aug 27;10:3860. doi: 10.1038/s41467-019-11806-5

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© The Author(s) 2019

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. 6 — ROMP of cyclopentadiene. a Dimerization of CPD at ambient temperature. b ROMP of CPD at −40 °C with Ru-8. Conversion was calculated from the ¹H NMR spectrum. No reaction was observed with G-II or G-III under same conditions. c Post-treatment of poly-CPD. Without purification, the crude poly-CPD was directly dissolved in THF and hydrogenated in quantitative yields. d Comparing polyethylene samples by solid-state ¹³ C NMR spectroscopy; commercially available low-density polyethylene (left), polyethylene via hydrogenation of poly-CPD (right)