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Abstract
The thermal reaction of Z-5-benzylidene-1,3-dialkylhydantoins with tetraphosphorusdecasulfide leads to the Z-5-benzylidene-1,3-dialkyl-4-thiohydantoins 1–4. The sulfuration occurs exclusively in position 4 of the hydantoin system; the corresponding E-isomers are not sulfurated at all.