Silicon disulphide and boron sulphide can be used with advantage instead of phosphorus pentasulphide for converting non-enolisable ketones, 2-pyrones and 4-pyrones into the corresponding thiones. Of the three reagents, boron sulphide is the most active and is often effective at ordinary temperatures. A convenient synthesis of 3,4-benzocoumarin is noted.
F. M. Dean, J. Goodchild and A. W. Hill, J. Chem. Soc. C, 1969, 2192 DOI: 10.1039/J39690002192
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