Ratio of 1,3- and 1,5-dialkyl-substituted pyrazoles obtained from chlorovinyl alkyl ketones and alkylhydrazines, 3(5)-pyrazoles and alkyl bromides

Article abstract of DOI:10.1134/S1070428014110190

Unsymmetrically substituted 1,3- and 1,5-dialkylpyrazoles and 1,3-dialkyl-5-chloropyrazoles were prepared. 2-Chlorovinyl ketones react with C₁-C₈-alkylhydrazines along two routes giving mixtures of 1-R′-3-R- and 1-R′-5-R-pyrazoles wi