Conversion of 2-thiohydantoins and their derivatives to the corresponding hydantoins in the processes of complexation reactions with copper(II) chloride dihydrateстатья
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Дата последнего поиска статьи во внешних источниках: 15 июля 2014 г.
Аннотация:The treatment of 5-pyridylmethylene-substituted 2-thiohydantoins or 2-alkylthio-3,5-dihydro-4H-imidazole-4-ones with CuCl2*2H2O affords the mononuclear or polymeric copper(II) complexes of the corresponding hydantoins. A presumable mechanism of hydantoin moiety formation involves Lewis acid catalyzed nucleophilic substitution of a sulfur-containing leaving group in the organic ligand by a water molecule from CuCl2 . 2H2O. The copper complexes Cu(L1-H)Cl(H2O) (7; L1 = (Z)-3-allyl-5-(pyridine-2-ylmethylene)imidazole-2,4(4H)-dione) and Cu(L2-H)2 (9; L2 = Z)-3-allyl-5-(50-bromo-pyridine-2-ylmethylene) imidazole-2,4(4H)-dione) were characterized by X-ray diffraction.