2-Thioxo-tetrahydro-4H-imidazol-4-ones, 2-alkylthio-3,5-dihydro-4H-imidazol-4-ones and their coordination compounds with transition metal ions

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Data published in the past decade on the methods of synthesis of 2-thiohydantoins and 2-alkylthio-3,5-dihydro-4 H -imidazol-4-ones are reviewed. Methods used to introduce various functional groups into positions 2 and 5 of thiohydantoin or 3,5-dihydro-4 H -imidazol-4-ones by using the condensation and nucleophilic substitution reactions are considered. The reactions of complex formation with the participation of thiohydantoins and 3,5-dihydro-4 H -imidazol-4-ones are analyzed, and the data on synthesis methods, structural types, and catalytic activity of their complexes with transition metals are presented.