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Initially, our explorations toward an photooxygenation protocol under mild reaction conditions focused on the reaction of 14H-spiro- [dibenzo[c,h]acridine-7,9'-fluorene] (SFDBA, 1a) (Table 1).
The reactions of spirofluoreneacridines proceeded smoothly to afford the corresponding photooxygenation products 2(a-d) in good to excellent yields (70-82%).
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