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The key step involves a tandem deprotonation\/cyclization sequence from readily accessible imine precursors, affording the desired BN\u2011fluoranthene cores in good yields. Site\u2011selective bromination at the C\u20115 position, which is remote from the BN\u2011embedded ring, was achieved and exploited for subsequent Suzuki and Sonogashira cross\u2011coupling reactions to install various aryl and alkynyl substituents. Structural analyses, including X\u2011ray crystallography and theoretical calculations, confirm a highly planar architecture with delocalized frontier molecular orbitals and show that replacing a C\u2550C unit with a B\u2212N bond markedly alters the local aromaticity of the five\u2011membered ring. When examined for their optical behavior, most of the synthesized derivatives exhibited intense fluorescence in dichloromethane, with quantum yields as high as 84%. Notably, while alkyl and aryl substituents caused little change in the spectral profiles, the incorporation of conjugated alkynyl groups led to consistent bathochromic shifts in both absorption and emission.<\/jats:p>","DOI":"10.1021\/acs.joc.6c01736","type":"journal-article","created":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T19:01:41Z","timestamp":1791313301000},"page":"14346-14354","source":"Crossref","is-referenced-by-count":0,"title":["Synthesis, Structure, and Properties of Peripheral BN-Fused Fluoranthenes"],"prefix":"10.1021","volume":"91","author":[{"given":"Bo","family":"Gao","sequence":"first","affiliation":[{"name":"Tianjin Normal University , , ,","place":["Tianjin, P. R. China, 300387"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peiyang","family":"Yuan","sequence":"additional","affiliation":[{"name":"Tianjin Normal University , , ,","place":["Tianjin, P. R. 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