With ethylene glycol as a green solvent, a general transition metal‐free photocatalytic system using 9‐mesityl‐10‐methylacridinium perchlorate (Acr + −Mes ⋅ ClO 4 − ) as catalyst was developed for the synthesis of sulfone‐containing heterocycles including thioflavones, oxindoles, and quinoline‐2,4(1 H ,3 H )‐diones through the cascade sulfonation/cyclization reactions under the irradiation of blue light at room temperature. magnified image
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Jiang et al. (2020) studied this question.
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