The oxidation of 9-substituted fluoren-9-yl anions to fluorenone by molecular oxygen in t-butyl alcohol is markedly accelerated by irradiation of added dye sensitisers (e.g., rose bengal) or by direct excitation of the carbanion, singlet oxygen being involved in both cases.
D. Bethell and R. G. Wilkinson, J. Chem. Soc. D, 1970, 1178 DOI: 10.1039/C29700001178
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