{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,21]],"date-time":"2026-09-21T15:02:19Z","timestamp":1790002939440,"version":"4.0.1"},"reference-count":54,"publisher":"MDPI AG","issue":"18","license":[{"start":{"date-parts":[[2026,9,17]],"date-time":"2026-09-17T00:00:00Z","timestamp":1789603200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Minister of Science and Higher Education Republic of Poland","award":["RID\/SP\/0032\/2024\/01"],"award-info":[{"award-number":["RID\/SP\/0032\/2024\/01"]}],"id":[{"id":"https:\/\/ror.org\/05dwvd537","id-type":"ROR","asserted-by":"crossref"}]},{"award":["RID\/SP\/0032\/2024\/01"],"award-info":[{"award-number":["RID\/SP\/0032\/2024\/01"]}],"id":[{"id":"https:\/\/ror.org\/05dwvd537","id-type":"ROR","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>Herein, we disclose an efficient route to the synthesis of 2-bromobenzo[b][1,4]dithiines from benzo[d][1,3]dithioles via ring expansion by introducing a carbon fragment of methyl or methylene groups into the heterocyclic rings promoted by bromine (51\u201394%). The use of a methyl substituent on an aromatic ring leads to the formation of an inseparable, equimolar mixture of regioisomers. Additionally, a 4-methoxyacetophenone derivative yielded unprecedented dimeric products, whose structure was confirmed by single-crystal X-ray crystallography. We propose a reaction mechanism, rationalizing the formation of the observed regioisomers.<\/jats:p>","DOI":"10.3390\/molecules31183301","type":"journal-article","created":{"date-parts":[[2026,9,21]],"date-time":"2026-09-21T14:12:09Z","timestamp":1789999929000},"page":"3301","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["1,4-Benzo[b]dithiine Derivatives Accessed via Ring Expansion of 1,3-Dithioles"],"prefix":"10.3390","volume":"31","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7009-0094","authenticated-orcid":false,"given":"Dawid T.","family":"Leja","sequence":"first","affiliation":[{"name":"ICN Polfa Rzesz\u00f3w S.A., Bausch Health Companies Inc., Przemys\u0142owa 2, 35-105 Rzesz\u00f3w, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1125-0684","authenticated-orcid":false,"given":"Wojciech J.","family":"Depa","sequence":"additional","affiliation":[{"name":"Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44\/52, 01-224 Warszawa, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7202-6064","authenticated-orcid":false,"given":"Maja","family":"Morawiak","sequence":"additional","affiliation":[{"name":"Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44\/52, 01-224 Warszawa, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2525-8051","authenticated-orcid":false,"given":"Agata","family":"Bajek-Bil","sequence":"additional","affiliation":[{"name":"Faculty of Chemistry, Rzeszow University of Technology, 6 Powsta\u0144c\u00f3w Warszawy Ave., 35-029 Rzesz\u00f3w, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7769-6363","authenticated-orcid":false,"given":"Jaromir B.","family":"Lechowicz","sequence":"additional","affiliation":[{"name":"Faculty of Chemistry, Rzeszow University of Technology, 6 Powsta\u0144c\u00f3w Warszawy Ave., 35-029 Rzesz\u00f3w, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6062-7062","authenticated-orcid":false,"given":"Gra\u017cyna","family":"Groszek","sequence":"additional","affiliation":[{"name":"Faculty of Chemistry, Rzeszow University of Technology, 6 Powsta\u0144c\u00f3w Warszawy Ave., 35-029 Rzesz\u00f3w, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,9,17]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Greene, T.W., and Wuts, P.G.M. 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