when oxidized w i t h ground s t a t e oxygen i n the presence o f t-BuOK i n DMSO, 10-mthylacridinium methosulfates ( l a ) gave strong l i g h t emission owing t o the fluorescence o f 10-methylacridone (2) e x c i t e d t o the S1 state.
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Suzuki et al. (1981) studied this question.