Abstract
The supposed 5-phenyl-2,4-dithiohydantoin (3) actually exists as its tautomer 5-mercapto-4-phenyl-4-imidazolin-2-thione (12). The reactions of the compound have been clarified by spectral studies of the products; in particular, mono- and dibenzylation have been shown to take place on sulfur and not (as reported) on nitrogen.

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