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The dye rhodamine-6G can act as a photocatalyst via photoinduced electron transfer (PET). After electronic excitation with green light, rhodamine-6G takes an electron from an electron donor like DIPEA and forms the rhodamine-6G radical. This radical has a reduction potential of ca. -0.90 V and can split phenyl iodide into iodine anions and phenyl radicals. Recently it has been reported that photoexcitation of the radical at 420 nm splits aryl bromides into bromine anions and aryl radicals. This requires an increase in reduction potenti
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