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Synthesis of 5-nitro-N,N-diphenylhydrazinopyrimidines and investigation of their free radicals
(1980) Boldyrev, I. V.; Polumbryk, Oleg; Markovskii, Leonid; Cherkasov, V. M.
A number of 5-nitro-N,N-diphenylhydrazinopyrimidines were synthesized. Free radicals were obtaines by oxidation of these compounds with PbO2. The stabilities of 5-nitro-4-pyrimidinylhydrazyl radicals are close to the stability of the α,α-diphenyl--2,4-dinitrophenylhydrazyl radical. The structures of the compounds obtained were confirmed by the UV, IR, PMR and EPR spectra.
Quantum-chemical investigation of spatial and electronic structure of verdazyl and its derivatives
(1979) Markovskii, Leonid; Polumbryk, Oleg; Nesterenko, A.
The unrestricted HF method in the INDO approximation with optimized geometry was used to describe the electronic structure of the hetero-ring of verdazyl and the derivatives of the latter. The results obtained are in good agreement with the experimental EPR spectra of triphenylverdazyl radical and its dipole moment. These data may be a basis for understanding and predicting the chemical properties and reactivity and its derivatives.