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The orientation of the amide bonds in these helicene analogues was designed to align with the winding direction of helicene. The introduction of a methyl group at the 3-position of the terminal aniline unit of the linear triamide precursor is crucial to the synthesis of the [7]helicene analogue. The molecular structures of the [5]helicene and [7]helicene analogues in the crystalline state were determined unequivocally by single-crystal X-ray diffraction analysis. The addition of trifluoroacetic acid to a solution of the [7]helicene analogue in dichloromethane increased the fluorescence intensity, whereas the absorption intensity remained unchanged. The enantiomers of the [7]helicene analogue were separated by high-performance liquid chromatography over a chiral stationary phase. The enantiomers exhibited circularly polarized luminescence with relatively large luminescence dissymmetry factors.<\/jats:p>","DOI":"10.1021\/acsomega.6c06995","type":"journal-article","created":{"date-parts":[[2026,8,20]],"date-time":"2026-08-20T15:02:19Z","timestamp":1787238139000},"page":"52003-52013","source":"Crossref","is-referenced-by-count":0,"title":["A Direct Arylation\nApproach for Helicene Analogues\nComposed of Unidirectional Amide Linkages"],"prefix":"10.1021","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3831-8260","authenticated-orcid":true,"given":"Akihiro","family":"Yokoyama","sequence":"first","affiliation":[{"name":"Seikei University , , 3-3-1 Kichijoji-kitamachi , , ,","place":["Musashino, Tokyo, Japan, 180-8633"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hirotaka","family":"Shimoda","sequence":"additional","affiliation":[{"name":"Seikei University , , 3-3-1 Kichijoji-kitamachi , , ,","place":["Musashino, Tokyo, Japan, 180-8633"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9390-5671","authenticated-orcid":true,"given":"Shoko","family":"Kikkawa","sequence":"additional","affiliation":[{"name":"Toho University , , 2-2-1 Miyama , , ,","place":["Funabashi, Chiba, Japan, 274-8510"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6651-2768","authenticated-orcid":true,"given":"Isao","family":"Azumaya","sequence":"additional","affiliation":[{"name":"Toho University , , 2-2-1 Miyama , , ,","place":["Funabashi, Chiba, Japan, 274-8510"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2850-4636","authenticated-orcid":true,"given":"Taro","family":"Tsubomura","sequence":"additional","affiliation":[{"name":"Seikei University , , 3-3-1 Kichijoji-kitamachi , , ,","place":["Musashino, Tokyo, Japan, 180-8633"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kosuke","family":"Oki","sequence":"additional","affiliation":[{"name":"Seikei University , , 3-3-1 Kichijoji-kitamachi , , ,","place":["Musashino, Tokyo, Japan, 180-8633"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,8,20]]},"reference":[{"key":"2026090307195106200_cit1","doi-asserted-by":"publisher","first-page":"1463","DOI":"10.1021\/cr200087r","article-title":"Helicenes:\nSynthesis and Applications","volume":"112","author":"Shen","year":"2012","journal-title":"Chem. 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