Oxidation of 5-p-toluenesulphonamido-3 3-dimethyloxindole with lead tetra-acetate gives 5-p-toluenesulphonimido-3,3-dimethyloxindole, a quinone di-imine, which undergoes addition of hydrogen chloride, hydrazoic and benzenesulphinic acids, and piperidine.
I. Baxter, D. W. Cameron, I. A. Mensah and M. R. Thoseby, J. Chem. Soc. C, 1971, 952 DOI: 10.1039/J39710000952
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