Superacidic bromination in oleum enables the first selective functionalization of the K-region of 2,7-diazapyrene. The resulting tetrabromide serves as a versatile cross-coupling platform for π-extension. Photophysical studies reveal that substitution topology governs the excited-state regime, switching between locally excited and charge-transfer emission.
D. Zych and A. Slodek, Chem. Commun., 2026, Accepted Manuscript , DOI: 10.1039/D6CC01587E
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