Phase transfer catalyzed C- Vs O- alkylation of 3-methyl-1-phenyl-2-pyrazolin-5-one in the absence or presence of carbon disulphide

Article abstract of DOI:10.3987/com-96-7671

3-Methyl-l-phenyl-2-pyrazolin-5-one (1) was treated with different bromoorganic compounds such as benzyl bromide, 1,3-dibromo propane,methyl bromoacetate, 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.