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5-Phenyl-2,4-imidazolidinedione (3a) and l-aryl-5-phenyl-2.4imidazolidinediones(3b-d) have been synthesized from a-keto hemithioacetal and urea or arvlureas.Although thioacetals have been enough studied and applied in organic synthesis.' hemithioacetals have seldom been investigated.In our investigation of hemithioacetals, we discovered that a-keto hemithioacetals are quite.stable and
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Zou et al. (1996) studied this question.
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