The conversion of thiocarbonyl compounds (thioureas, thioamides, and thiones) into their oxygen analogues has been performed using either (i) potassium t-butoxide with iodine, bromine, or chlorine, (ii) sodium ethoxide with bromine or chlorine, or (iii) sodium hydroxide with bromine or chlorine under phase transfer catalysis.
H. Singh, P. Singh and N. Malhotra, J. Chem. Soc., Perkin Trans. 1, 1981, 2647 DOI: 10.1039/P19810002647
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