Some indole derivatives were submitted to the oxidation with thallium(II1) trinitrateITTN1 to give the corresponding oxindole and isatin derivatives.Indole-3-propionic acid derivatives were oxidized with TTN to afford the spiro-y-lactones in good yields.During the past decade, the investigation of oxidation reaction of olefinic compounds with thallium(II1) reagents has been extensively made by McKillop and
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Ban et al. (1982) studied this question.