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Synthesis 1991; 1991(6): 481-482
DOI: 10.1055/s-1991-26500
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Phase-Transfer Catalyzed Condensation of 3-Methyl-5-pyrazolone with Carbon Disulfide and Alkyl Bromides

Alfonso Oliva* , Isabel Castro, Christian Castillo, Gerardo León
  • *Instituto de Química, Universidad Católica de Valparaíso Casilla 4059, Valparaíso, Chile
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Publication Date:
29 April 2002 (online)

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Reaction of 3-methyl-5-pyrazolones with carbon disulfide and alkyl bromides under phase-transfer catalysis to give alkyl 5-hydroxy-3-methyl-1H -pyrazole-4-carbodithioates is described. Using 1,2-dibromoethane or 1,3-dibromopropane, the corresponding cyclic ketene dithioacetals are formed.