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aza-oxa[7]helicene was synthesized from the commercially available N1,N4-di(naphthalen-2-yl)benzene-1,4-diamine and p-benzoquinone in two steps. Combining the acid-mediated annulation with the electrochemical sequential reaction (oxidative coupling and dehydrative cyclization) afforded this double hetero[7]helicene. Moreover, the structural and optical features of this molecule have been studied using X-ray crystallographic analysis, and the absorption and emission behaviors were rationalized based on DFT calculations.<\/jats:p>","DOI":"10.3390\/molecules27249068","type":"journal-article","created":{"date-parts":[[2022,12,20]],"date-time":"2022-12-20T02:05:02Z","timestamp":1671501902000},"page":"9068","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":20,"title":["Two-Step Synthesis, Structure, and Optical Features of a Double Hetero[7]helicene"],"prefix":"10.3390","volume":"27","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8919-095X","authenticated-orcid":false,"given":"Mohamed S. H.","family":"Salem","sequence":"first","affiliation":[{"name":"SANKEN, Osaka University, Ibaraki-shi, Osaka 567-0047, Japan"},{"name":"Pharmaceutical Organic Chemistry Department, Faculty of Pharmacy, Suez Canal University, Ismailia 41522, Egypt"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2347-6995","authenticated-orcid":false,"given":"Ahmed","family":"Sabri","sequence":"additional","affiliation":[{"name":"SANKEN, Osaka University, Ibaraki-shi, Osaka 567-0047, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9153-235X","authenticated-orcid":false,"given":"Md. 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