Nitrosothioureas may be prepared by treatment of thioureas with NaNO2 in 0·1 N HCl at –5 °C by direct N-nitrosation whereas 15N n.m.r. studies at –10 °C which employed specifically 15N-enriched compounds revealed the intermediacy of a thionitrosyl compound under more acidic conditions which gave the urea by hydrolysis.
J. W. Lown and S. M. S. Chauhan, J. Chem. Soc., Chem. Commun., 1981, 675 DOI: 10.1039/C39810000675
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