G. Levkovskaya, G. V. Bozhenkov, L. Larina
Oct 1, 2002
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0
Influential Citations
20
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Journal
Russian Journal of Organic Chemistry
Abstract
A new regioselective heterocyclization was revealed in the reaction of 2-chloro- and 2,2-dichloro(bromo)vinyl ketones with N,N-dimethylhydrazine to afford 3-substituted 1-methyl(5-halo)pyrazoles. The reaction is accompanied by elimination of methyl halide and formation of up to 90% of N,N,N-trimethylhydrazinium halide as the second product.