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The radicals were obtained in five consecutive steps with total yields of 38 and 16%, respectively; key steps are Suzuki couplings and cyclizing S\n                    <jats:sub>E<\/jats:sub>\n                    Ar reactions. Mesityl substituents at the five\u2010membered rings ensure the kinetic stability of the radicals. They were characterized by EPR and UV\/Vis spectroscopy. Quantum chemical calculations led to simulated UV\/Vis\/NIR spectra and disclosed further properties like spin densities, aromaticity, and orbital energies. Both radicals are best described with the unpaired electron centered in the outer five\u2010membered rings. The respective resonance formulas show the largest number of fully intact benzene rings. A possible triradical character was computed to be small in both compounds. The five\u2010membered rings, especially the central rings show significant antiaromatic character.\n                  <\/jats:p>","DOI":"10.1002\/chem.202502467","type":"journal-article","created":{"date-parts":[[2025,10,6]],"date-time":"2025-10-06T04:21:22Z","timestamp":1759724482000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Cyclopenta\u2010Fused Polyaromatic Hydrocarbon (CP\u2010PAH) Radicals: Synthesis, Characterization, and Quantum Chemical Calculations"],"prefix":"10.1002","volume":"31","author":[{"ORCID":"https:\/\/orcid.org\/0009-0003-8563-9101","authenticated-orcid":false,"given":"Ali S.","family":"Acan","sequence":"first","affiliation":[{"name":"Institute of Organic Chemistry Karlsruhe Institute of Technology (KIT)  Kaiserstra\u00dfe 12 76131 Karlsruhe Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-5004-989X","authenticated-orcid":false,"given":"Jonas O.","family":"Wenzel","sequence":"additional","affiliation":[{"name":"Institute of Inorganic Chemistry Karlsruhe Institute of Technology (KIT)  Kaiserstra\u00dfe 12 76131 Karlsruhe Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7881-6905","authenticated-orcid":false,"given":"Joachim","family":"Podlech","sequence":"additional","affiliation":[{"name":"Institute of Organic Chemistry Karlsruhe Institute of Technology (KIT)  Kaiserstra\u00dfe 12 76131 Karlsruhe Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,10,5]]},"reference":[{"key":"e_1_2_7_1_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.197005271"},{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/jlac.197719770615"},{"key":"e_1_2_7_3_1","first-page":"3","volume-title":"Polycyclic Arenes and Heteroarenes: Synthesis, Properties, and Applications","author":"Das S.","year":"2016"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1039\/C6SC01795A"},{"key":"e_1_2_7_5_1","volume":"2","author":"Das S.","year":"2017","journal-title":"Phys. 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