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Pyrazole derivatives R 0180Chloro (bromo)vinyl Ketones and 2,2-Dichloroacrolein in Reactions with Hydrazines. -Ketones (I) react with alkylhydrazines to afford pyrazoles (III) in good to high yield. In contrast, 2,2-dichloroacrolein (IV) gives only rise to hydrazones (V) even under harsher reaction conditions. The subsequent heterocyclization of (V) into the desired pyrazoles by heating or in the presence of bases failed. -(BOZHENKOV, G. V.; LEVKOVSKAYA, G. G.; MIRSKOVA, A. N.; DOLGUSHIN, G. V.; LARINA, L. I.; USHAKOV, P. E.; Russ.

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