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Synthesis 1993; 1993(6): 561-562
DOI: 10.1055/s-1993-25902
short paper
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Synthesis of Imidazol-2-ylidenes by Reduction of Imidazole-2(3H)-thiones

Norbert Kuhn* , Thomas Kratz
  • *Fachbereich 6 (Chemie) der Universität (GH) Duisburg, Lotharstr. 1, D-4100 Duisburg 1, Germany
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Publication Date:
17 September 2002 (online)

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An improved synthesis of the title compounds is reported. Reaction of the N,N-dialkylthioureas 1 with 3-hydroxy-2-butanone gives the imidazole-2(3H)-thiones 2 which on treatment with potassium in boiling tetrahydrofuran give the imidazol-2-ylidenes 3 in excellent yields.