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In both cases, full conversion of the phenol groups was achieved in only 1\u2005h at 150\u2009\u00b0C without solvent and with K<jats:sub>2<\/jats:sub>CO<jats:sub>3<\/jats:sub> as a cheap and safe catalyst. This reaction was later applied to other condensed tannins and technical lignins (Kraft and organosolv), showing only little dependence on the chemical structure of the polyphenols. The obtained derivatives were thoroughly characterized by <jats:sup>1<\/jats:sup>H and <jats:sup>31<\/jats:sup>P\u2005NMR spectroscopy, FTIR spectroscopy, and size\u2010exclusion chromatography. The developed method was compared with previously published protocols for the introduction of vinyl groups on lignin, and shows promising advances toward the modification of biobased polyphenols according to green chemistry principles. The obtained macromolecules show great potential as highly versatile biobased aromatic building blocks for the synthesis of polymers through, for example, radical, metathesis, or thiol\u2013ene reactions.<\/jats:p>","DOI":"10.1002\/cssc.201700066","type":"journal-article","created":{"date-parts":[[2017,2,14]],"date-time":"2017-02-14T09:56:40Z","timestamp":1487066200000},"page":"1813-1822","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":33,"title":["Solvent\u2010 and Halogen\u2010Free Modification of Biobased Polyphenols to Introduce Vinyl Groups: Versatile Aromatic Building Blocks for Polymer Synthesis"],"prefix":"10.1002","volume":"10","author":[{"given":"Antoine","family":"Duval","sequence":"first","affiliation":[{"name":"BioTeam\/ICPEES-ECPM, UMR 7515 Universit\u00e9 de Strasbourg  25 rue Becquerel 67087 Strasbourg Cedex 2 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