Bis-(2-carboxyphenyl)sulphur dihydroxide dilactone was prepared from 2,2′-thiodibenzoic acid and from 2,2′-sulphinyldibenzoic acid; the structure of this stable dilactone containing a four-co-ordinated sulphur(IV) atom was investigated by chemical, spectroscopic, and X-ray methods.
I. Kapovits and A. Kálmán, J. Chem. Soc. D, 1971, 649b DOI: 10.1039/C2971000649B
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