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The 1,3-dialkyl-5-hydroxy-2-thioxoimidazolidin-4-ones 8 (R = Me, Et,  i Pr) were obtained from the corresponding thiourea and glyoxylic acid monohydrate in very good yield. Their reactions with chlorotrimethylsilane in the presence of triethylamine gave the 1,3-dialkyl-5-trimethylsiloxy-2-thioxoimidazolidin- 4-ones 9. NMR and crystal structure data of 1,3-diisopropyl-5-hydroxy-4-thioxoimidazolidin-4-one (8c) have confirmed the acyloin-type structure of the above mentioned compounds.

1,3-Dialkyl-5-hydroxy-2-thioxoimidazolidin-4-one / 1,3-Dialkyl-5-hydroxy-2-thioxoimidazolidin-4-ones