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The presented approach has numerous advantageous qualities, including utilization of readily available substrates, broad scope, scalability, and good reaction yields. Importantly, some of the benzofurans prepared by this method were heretofore inaccessible by any other known transformation. Importantly, furo[2,3\u2010<jats:italic>b<\/jats:italic>]pyrazines and heretofore unexplored difuro[2,3\u2010<jats:italic>c<\/jats:italic>:3\u2032,2\u2032\u2010<jats:italic>e<\/jats:italic>]pyridazine can be prepared using this strategy. Spectroscopic studies reveal that for simple systems, absorption and fluorescence maxima fall within the UV spectral range, while \u03c0\u2010electron system expansion red\u2010shifts both spectra. Moreover, the good fluorescence quantum yields observed in solution, up to 96\u2009%, are also maintained in the solid state. Experimental results are supported by density functional theory (DFT) calculations. The presented methodology, combined with the spectroscopic characteristics, suggest the possibility of using <jats:bold>F<jats:sub>4<\/jats:sub>BF<\/jats:bold>s in the optoelectronic industry (i.\u2009e., organic light emitting devices (OLED), organic field\u2010effect transistors (OFET), organic photovoltaics (OPV)) as inexpensive and readily available emissive or semiconductor materials.<\/jats:p>","DOI":"10.1002\/chem.202203464","type":"journal-article","created":{"date-parts":[[2023,1,25]],"date-time":"2023-01-25T14:04:09Z","timestamp":1674655449000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Conversion of Ketones into Blue\u2010Emitting Electron\u2010Deficient Benzofurans"],"prefix":"10.1002","volume":"29","author":[{"given":"Krzysztof","family":"G\u00f3rski","sequence":"first","affiliation":[{"name":"Institute of Organic Chemistry of Polish Academy of Sciences  Kasprzaka 44\/52 01-224 Warsaw Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tea","family":"Ostoji\u0107","sequence":"additional","affiliation":[{"name":"Division of Theoretical Physics Ru\u0111er Bo\u0161kovi\u0107 Institute  Bijeni\u010dka cesta 54 10000 Zagreb Croatia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8251-5440","authenticated-orcid":false,"given":"Marzena","family":"Banasiewicz","sequence":"additional","affiliation":[{"name":"Institute of Physics Polish Academy of Sciences  Al. 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