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Paper | Regular issue | Vol 45, No. 3, 1997, pp.451-465
Published online, 1st January, 1970
DOI: 10.3987/COM-96-7671
Phase Transfer Catalyzed C- vs O-Alkylation of 3-Methyl-1-phenyl-2-pyrazolin-5-one in the Absence or Presence of Carbon Disulphide

Mohamed Ali Hassan* and Dietrich Döpp

*Department of Chemistry, Faculty of Science, Ain Shams University, Abbassiya 11566, Cairo, Egypt

Abstract

3-Methyl-1-phenyl-2-pyrazolin-5-one (1) was treated with differenet bromoorganic compounds such as benzyl bromide, 1,3-dibromopropane, methyl bromoacetaldehyde diethylacetal as alkylating agents either in the absence or in the presence of carbon disulphide and under phase-transfer catalysis conditions aimed at studying the reactivity of the title compound with respect to C- vs O-alkylation.