3-Arylindoline-2-thiones (Ia, c) are present as a tautomeric mixture of (I) and (II) in solution; autoxidation of some indolinethiones (I) gave disulphides (III), but the 1-methyl compound gave the oxo-indolinethione (IV).
T. Hino, M. Nakagawa, T. Suzuki, S. Takeda, N. Kano and Y. Ishii, J. Chem. Soc. D, 1971, 836 DOI: 10.1039/C29710000836
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