Treatment of 1,3-diarylthioureas with superoxide anion (O2˙–) at 20 °C in tetrahydrofuran or acetonitrile resulted in the formation of 1,2,3-triarylguanidines in excellent yields.
Y. H. Kim and G. H. Yon, J. Chem. Soc., Chem. Commun., 1983, 715 DOI: 10.1039/C39830000715
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