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Abstract
2-Arylhydrazono-2-bromo-1-[3-ethoxycarbony1-5methy1-1-p-toly]pyrazol-4-ylethanone (5a-e) were synthesized via reaction of [3-(ethoxycarbony1-5methyl-1-p-tolypyra-zol-4-oyl]-2-oxoethy(dimethyl) sulphonium bromide with N-nitrosoacetarylamides in ethanol. The reactions of hydrazonoyl bromides with each of potassium thiocyanate, thiourea, and alkyl carbodithioates are discussed. Structures of the newly synthesized compounds were elucidated on the bases of spectral data, elemental analyses, and alternative method whenever possible.