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. 2018 Nov 30;8:17483. doi: 10.1038/s41598-018-35933-z

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© The Author(s) 2018

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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Synthesis procedure towards monodisperse oligo(1,4-phenylene ethynylene)s through Sonogashira cross-coupling with the building block 1 and subsequent deprotection. The approach in solution yields the protected monomer 2, the deprotected monomer 3, the respective versions of the dimers 4 and 5, the trimers 6 and 7, the tetramers 8 and 9 as well as the pentamers 10 and 11. Cleavage from the resin in SPOS results in the azide functionalised monomer 12.