Reactions with hydrazonoyl halides XXVI: Synthesis and utility of C-pyrazoloyl-N-arylhydrazonoyl bromides

2-Arylhydrazono-2-bromo-1-[3-ethoxycarbonyl-5-methyl-1-p-tolyl]pyrazo]-4-yl ethanone (5a-e) were synthesized via reaction of [3-(ethoxycarbonyl-5-methy l-1-p-tolypyrazol-4-oyl]-2-oxoethyl(dimethyl)sulfonium bromide with N-nitro soacetarylamides in ethanol. The reactions of hydrazonoyl bromides with eac h of potassium thiocyanate, thiourea, and alkyl carbodithioates are discuss ed. Structures of the newly synthesized compounds were elucidated on the ba ses of spectral data, elemental analyses, and alternative method whenever p ossible.