Chromatographic component of identification of the transformation products of 1,1-dimethylhydrazine in the presence of sulfur
The gas-chromatographic retention indices of the products of 1,1-dimethylhydrazine transformations in the presence of sulfur allows one to confirm and, in ceratin cases, make more exact the results of their gas chromatography-mass spectrometry identificat
Zenkevich,Ul'Yanov,Golub,Buryak
p. 1106 - 1114
(2014/08/05)
1-Alkylpyrazoles and 1-alkyl-5-chloropyrazoles from halovinyl ketones and 1,1-dialkylhydrazines
Regioselective heterocyclization of alkyl 2-chloro-and 2,2-dichlorovinyl ketones with 1,1-dialkyl-hydrazines to 1,3-dialkyl-1H-pyrazoles and 1,3-dialkyl-5-chloro-1H-pyrazoles involves intermediate formation of the corresponding dialkylhydrazones. Fragment
New synthesis and properties of 3-alkyl-, 3-chloroalkyl-, 3-perfluoroalkyl-, and 3-aryl-1-methyl-(5-halo)pyrazoles from chloro(bromo) vinyl ketones and N,N-dimethylhydrazine
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.
Levkovskaya,Bozhenkov,Larina,Mirskova
p. 1501 - 1506
(2007/10/03)
Synthesis of pyrazole derivatives from 1,1-dimethylhydrazine and chlorovinyl ketones
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Levkovskaya,Bozhenkov,Malyushenko,Mirskova
p. 1795 - 1796
(2007/10/03)
Systemic fungicides. The synthesis of certain pyrazole analogues of carboxin