The chemiluminescent autoxidation of over fifty indoles has been measured in dimethyl sulfoxide (DMSO). The 3‐alkylindole derivatives represent the brightest and most efficient members of this group. The chemiluminescence yield (per mole) of skatole is (1·5 ± 0·6) × 10 ‐3 . The chemiluminescence spectrum of skatole is identical with the fluorescence spectrum of o‐formamidoacetophenone in the same environment Similar results for 2,3‐dimethylindole lead to the identification of the acylamide anion as the emitter in indole chemiluminescence. A peroxide ring cleavage excitation mechanism is proposed.
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Berger et al. (1968) studied this question.
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