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The optimized protocol using 0.6 equiv of diorganyl diselenide and 1 equiv of FeCl3 in DCM at room temperature exhibited a broad substrate scope and high tolerance toward diverse functional groups. This approach occurs by in situ formation of an electrophilic selenium species, which undergoes a 7-endo-dig cyclization to furnish the heterocyclic core. This method provides straightforward access to functionalized dibenzo[b,f]oxepines containing selenium, a motif of interest due to its relevance in medicinal chemistry and materials science.<\/jats:p>","DOI":"10.1021\/acsomega.6c07135","type":"journal-article","created":{"date-parts":[[2026,8,4]],"date-time":"2026-08-04T13:15:30Z","timestamp":1785849330000},"page":"47113-47121","source":"Crossref","is-referenced-by-count":1,"title":["Synthesis of Selenylated\nDibenzo[\n                    <i>b,f<\/i>\n                    ]oxepines from an Electrophilic Cyclization\nReaction"],"prefix":"10.1021","volume":"11","author":[{"given":"Liliane S.","family":"de Farias","sequence":"first","affiliation":[{"name":"Universidade Federal do Rio Grande\u2500FURG, Escola de Qui\u0301mica e Alimentos\u2500EQA , , Ita\u0301lia Ave., km 8, no number\u2500Campus Carreiros , , ,","place":["Rio Grande, RS, Brazil, 96203-900"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sabrina B.","family":"Acosta","sequence":"additional","affiliation":[{"name":"Universidade Federal de Pelotas\u2500UFPel , , P.O. 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