M. A. Andreeva

Nitration of 4-halo-1-methylpyrazoles in sulfuric acid

The rate of nitration of 4-bromo- and 4-chloro-1-methylpyrazoles with nitric acid in various concentrations of sulfuric acid is higher at position 5 than at position 3.

Nucleophilic substitution reactions in 4-halonitro-pyrazolecarboxylic acids

The reaction of 4-bromo-1-methyl-3-nitropyrazole-5- and 4-bromo-1-methyl-5-nitro-pyrazole-3-carboxylic acids with arylamines in aqueous solution in the presence of monovalent copper salts leads to the formation of 4-arylamino- and 4-hydroxy substituted nitropyrazolecarboxylic acids.

Nitration of pyrazolo[4,3-b]quinolinones

The nitration of 1-methyl-4H-pyrazolo[4,3-b]quinolin-9-one and some of its derivatives with nitric acid in sulfuric acid and acetic anhydride was studied. It was established that the number and site of incorporation of the nitro groups depends on the nature of the attacking agent, the reaction conditions, and the substituents present in the molecule.

Spectral and electrochemical properties of ortho-amino-1-methylnitropyrazoles

The influence of the electron density distribution in the pyrazole ring and the efficacy of the action of amino and nitro groups in the ortho position of amino-1-methylnitropyrazoles on their electrochemical characteristics and IR and electron absorption spectra has been studied.