{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,15]],"date-time":"2026-06-15T10:56:56Z","timestamp":1781521016672,"version":"3.54.1"},"reference-count":43,"publisher":"Wiley","issue":"19","license":[{"start":{"date-parts":[[2026,3,4]],"date-time":"2026-03-04T00:00:00Z","timestamp":1772582400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,3,4]],"date-time":"2026-03-04T00:00:00Z","timestamp":1772582400000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["chemistry-europe.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Chemistry A European J"],"published-print":{"date-parts":[[2026,5,22]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    Intramolecular annulation between the helical termini of helicenes provides a direct route to circulene\u2010type architectures. In thia[6]helicene, oxidation at the thiophene terminus to the\n                    <jats:italic>S<\/jats:italic>\n                    ,\n                    <jats:italic>S<\/jats:italic>\n                    \u2010dioxide facilitates the thermal conversion to coronene, but established protocols typically require elevated temperatures. Herein, we demonstrate that forming a phenoxide anion at the benzene terminus of thia[6]helicene\n                    <jats:italic>S<\/jats:italic>\n                    ,\n                    <jats:italic>S<\/jats:italic>\n                    \u2010dioxides enables this transformation at room temperature, affording coronene in near\u2010quantitative yield. Phenoxide arises either by deacetylation of the acetate precursor or by deprotonation of the corresponding phenol. Owing to the solubility contrast between the helical precursor and planar coronene, the product precipitates from solution, allowing the conversion to be monitored visually, and can be isolated by simple filtration. This helix\u2010to\u2010disc conversion begins with a stepwise intramolecular Diels\u2013Alder reaction, and computational analysis elucidates the complete pathway to coronene. The present strategy delivers a practical room\u2010temperature route to planar aromatic frameworks via an anion\u2010triggered Diels\u2013Alder reaction, without oxidative Scholl\u2010type conditions, and broadens opportunities for the late\u2010stage planarization of helicenes and related \u03c0\u2010systems.\n                  <\/jats:p>","DOI":"10.1002\/chem.70843","type":"journal-article","created":{"date-parts":[[2026,3,8]],"date-time":"2026-03-08T22:55:16Z","timestamp":1773010516000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Room\u2010Temperature Helix\u2010to\u2010Disc Conversion of Thia[6]helicene\n                    <i>S<\/i>\n                    ,\n                    <i>S<\/i>\n                    \u2010Dioxides to Coronene via In Situ Phenoxide Anion Generation"],"prefix":"10.1002","volume":"32","author":[{"given":"Kaito","family":"Seino","sequence":"first","affiliation":[{"name":"Faculty of Science Yamagata University  Yamagata Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Takashi","family":"Murase","sequence":"additional","affiliation":[{"name":"Faculty of Science Yamagata University  Yamagata 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