Autoxidation of 1,3-disubstituted thioureas in the presence of oxygen and tertiary butoxide in tertiary butanol afforded the corresponding ureas in good yields together with small amounts of the corresponding guanidines while the same treatment of benz- or naphth-imidazole-2-thiones gave the parent imidazoles and the 2-sulphonic acids.
Y. H. Kim, H. J. Kim and G. H. Yon, J. Chem. Soc., Chem. Commun., 1984, 1064 DOI: 10.1039/C39840001064
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